2A6X1 Vol. 4 Ure's (Mfe)

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1. The term "No. 320 grit" refers to which feature of sandpaper?

Explanation

The term "No. 320 grit" refers to the coarseness of sandpaper. Grit is a measure of the size of abrasive particles on the sandpaper. The higher the grit number, the finer the particles and the smoother the sandpaper. In this case, "No. 320 grit" indicates that the sandpaper has a relatively fine coarseness, making it suitable for finer sanding and finishing tasks.

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About This Quiz
Aerospace Quizzes & Trivia

This quiz assesses knowledge on the 54H60-91 propeller system, focusing on components like the barrel, beta feedback shaft, and pitchlock regulator. It evaluates understanding of mechanical functions and configurations critical for aerospace engineering and maintenance.

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2. which 54H60-91 propeller subassembly transmits engine torque to the propeller blades?

Explanation

The barrel of a 54H60-91 propeller subassembly transmits engine torque to the propeller blades.

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3. When attempting to unfeather the 54H60-91 propeller in flight, where must the throttle be positioned?

Explanation

When attempting to unfeather the 54H60-91 propeller in flight, the throttle must be positioned above FLT IDLE. This means that the throttle should be set to a higher position than the flight idle setting.

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4. The pneumatic air bled from the small gas turbine engine cannot be used to

Explanation

The pneumatic air bled from the small gas turbine engine cannot be used to inflate aircraft tires because the air bled from the engine is not at a high enough pressure to inflate the tires effectively. Inflating aircraft tires requires a high-pressure air source, such as an air compressor, to provide the necessary force to inflate the tires to the appropriate pressure.

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5. On the 54H60-91 propeller, if the main filter becomes clogged, which valve opens to assure continued flow?

Explanation

If the main filter becomes clogged on the 54H60-91 propeller, the bypass valve opens to assure continued flow. This valve allows the fluid to bypass the clogged filter and continue flowing through the system, preventing any disruption or damage to the propeller.

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6. The purpose fo the 54H60-91 propeller pitchlock assembly is to prevent

Explanation

The purpose of the 54H60-91 propeller pitchlock assembly is to prevent an engine overspeed due to a loss of hydraulic pressure. This means that if there is a loss of hydraulic pressure, the propeller pitchlock assembly will engage and prevent the propeller from spinning too fast, which could cause damage to the engine. This safety mechanism ensures that the engine operates within its safe speed limits even in the event of a hydraulic pressure loss.

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7. Besides maintaing the optimum blade phase angle relationship between all propellers, what else does sychrophhasing do?

Explanation

Synchronizing, or synchrophasing, is a system that ensures all propellers on a multi-engine aircraft rotate at the same speed. By maintaining the optimum blade phase angle relationship between all propellers, synchrophasing eliminates any speed differences and ensures that all propellers rotate at the same speed. This helps to reduce vibrations, improve efficiency, and enhance overall performance of the aircraft.

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8. On the 54H60-91 propeller, which pitchlock component mechanically holds the stationary and rotating pitchlock ratchets apart during reversing adn unfeatherin operations?

Explanation

The pitchlock control cam is the component that mechanically holds the stationary and rotating pitchlock ratchets apart during reversing and unfeathering operations on the 54H60-91 propeller.

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9. On the 54H60-91 propeller, which component provides a means for balancing the propeller?

Explanation

The hub mounting bulkhead provides a means for balancing the propeller on the 54H60-91 propeller. Balancing the propeller is important to ensure smooth and efficient operation. The hub mounting bulkhead is responsible for securely attaching the propeller blades to the hub and distributing the weight evenly. This helps to minimize vibrations and maintain proper alignment, resulting in optimal performance of the propeller.

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10. On the 54H60-91 propeller, during normal porpeller operation, the output of which pumps is used?

Explanation

During normal propeller operation on the 54H60-91 propeller, the output of the main pressure and main scavenge pumps is used. These pumps are responsible for providing the necessary pressure and scavenging functions to ensure proper operation of the propeller. The main pressure pump supplies hydraulic pressure to control the pitch of the propeller blades, while the main scavenge pump removes any excess oil or debris from the propeller system. Both pumps play a crucial role in maintaining the efficiency and functionality of the propeller during normal operation.

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11. If the master propeller fails during synchrophaser governing, the slave propellers follow the master to

Explanation

If the master propeller fails during synchrophaser governing, the slave propellers will follow the master to about a 2% speed change. This means that the slave propellers will adjust their speed slightly to match the speed change of the master propeller.

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12. When you perform a static blade transition check and abnormal noises are detected, the 54H60-91 propeller must be returned to depot. What AFTO form must be documented and accompany the propeller back to depot?

Explanation

When performing a static blade transition check, abnormal noises are detected, it indicates a potential issue with the 54H60-91 propeller. In such cases, the propeller must be returned to the depot for further inspection and maintenance. The AFTO form 95 must be documented and accompany the propeller back to the depot. This form is used for recording and tracking maintenance actions and ensures that all necessary information is documented and communicated effectively.

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13. On a GTCP165 engine shutdown, what valve closes to ensure fuel-flow is terminated?

Explanation

The fuel shutoff solenoid is the valve that closes to ensure fuel flow is terminated during a GTCP165 engine shutdown. This solenoid is responsible for cutting off the fuel supply to the engine, preventing any further fuel from entering the combustion chamber. By closing this valve, the fuel flow is effectively stopped, ensuring a safe and controlled shutdown of the engine.

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14. On a GTCP165 engine oil system, air that leaks past various oil seals exits through the

Explanation

On a GTCP165 engine oil system, air that leaks past various oil seals exits through the vent system. The vent system is designed to release any excess pressure or gases that may build up in the oil system. By allowing the air to escape through the vent system, it helps maintain the proper pressure and functioning of the oil system.

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15. On the 54H60-91 propeller, which component delivers the actual propeller blade angle from the blade to the control assembly?

Explanation

The beta feedback shaft delivers the actual propeller blade angle from the blade to the control assembly on the 54H60-91 propeller. This component allows for the adjustment and control of the propeller blade angle, ensuring optimal performance and efficiency.

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16.
on the 54H60-91 propeller, the output of what pump is sufficient to supply hydraulic pressure for nomal propeller operation?
 

Explanation

The correct answer is "main pressure". On the 54H60-91 propeller, the main pressure pump is responsible for supplying hydraulic pressure for normal propeller operation. This pump is designed to provide sufficient pressure to ensure the propeller functions properly. The auxiliary pressure, standby pressure, and backup pressure pumps may be used in certain situations, but the main pressure pump is the primary source of hydraulic pressure for the propeller.

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17. To reduce the noise and vibration levels, synchrophasing mode of governing maintains all the propellers at

Explanation

The synchrophasing mode of governing is used to reduce the noise and vibration levels. By maintaining all the propellers at identical speeds, it ensures that they are all operating in sync, which helps to minimize any imbalances or disturbances that could cause noise or vibration. Additionally, by optimizing the blade phase angles, the propellers can work together more efficiently, further reducing noise and vibration. Therefore, the correct answer is identical speeds and optimum blade phase angles.

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18. On the 54H60-91 propeller, during alpha range operation, which cam changes speeder spring tension so the governor pilot valve can maintain 100 percent rpm?

Explanation

The correct answer is "speed set". On the 54H60-91 propeller, the speed set cam is responsible for changing the speeder spring tension. This adjustment allows the governor pilot valve to maintain 100 percent RPM during alpha range operation. The speed set cam ensures that the propeller operates at the desired speed, providing optimal performance.

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19. On the 54H60-91 propeller, during feather operation, between approximately what psi are the pressure cutout switch contacts opened?

Explanation

During feather operation on the 54H60-91 propeller, the pressure cutout switch contacts are opened between approximately 600 to 800 psi.

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20. The master synchrophaser board located int the synchrophaser unit contains a master channel and a slave channel. these channels are used by which propellers?

Explanation

The master synchrophaser board located in the synchrophaser unit contains a master channel and a slave channel. These channels are used by propellers no. 2 and no. 3.

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21. How much change in rpm does the compensating network in the synchrophaser unit allow the speed bias motor to correct?

Explanation

The compensating network in the synchrophaser unit allows the speed bias motor to correct a change in rpm by 2%. This means that the motor can adjust the speed by a maximum of 2% to compensate for any variations in rpm.

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22. Which type fo special inspection can be used to find minute cracks on a propeller blade?

Explanation

Purple dye is used for special inspection to find minute cracks on a propeller blade. This type of inspection involves applying the dye to the surface of the blade and then using a special ultraviolet light to detect any cracks or defects. The dye penetrates into the cracks, making them visible under the UV light. This method is effective in identifying small cracks that may not be easily visible to the naked eye.

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23. When used for ground operation, the SGT engine can be installed on

Explanation

The SGT engine, when used for ground operation, can be installed on a four-wheel trailer. This implies that the engine is designed to be mobile and can be easily transported on a trailer with four wheels. This setup allows for flexibility and convenience in moving the engine to different locations for ground operations. The other options mentioned, such as pods, an H-frame, and a two-wheel trailer, are not suitable for installing the SGT engine for ground operation.

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24. On the 54H60-91 propeller, which dome assembly part allow the rotating cam to turn while the stationary cam remains in a fixed postion?

Explanation

Ball bearings allow the rotating cam to turn while the stationary cam remains in a fixed position. Ball bearings are designed to reduce friction and allow smooth rotation between two parts. In this case, the ball bearings enable the rotating cam to spin freely while the stationary cam remains fixed, ensuring proper functioning of the 54H60-91 propeller.

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25. On the 54H60-91 propeller, when the throttle is moved to the GROUND IDLE position, what degree setting does the coordinator pointer indicate on the protractor?

Explanation

When the throttle is moved to the GROUND IDLE position on the 54H60-91 propeller, the coordinator pointer indicates a degree setting of 18* on the protractor.

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26. The condition lever GND STOP position is only effective on the ground because the circuits made in this position are completed throw what switches?

Explanation

The condition lever GND STOP position is only effective on the ground because the circuits made in this position are completed through the landing gear touchdown switch. This switch is activated when the aircraft's landing gear makes contact with the ground, allowing the condition lever to be moved to the GND STOP position. This position cuts off fuel flow to the engine, preventing it from running while the aircraft is on the ground.

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27. On the 54H60-91 propeller, what forces the stop levers on the low pitch stop to move outward?

Explanation

The stop levers on the low pitch stop of the 54H60-91 propeller move outward due to the action of a wedge.

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28. On the 54H60-91 propeller, what function is a task of the low pitch stop assembly?

Explanation

The low pitch stop assembly on the 54H60-91 propeller prevents the propeller from going into the beta range when the throttle is positioned in the alpha range. This means that it restricts the propeller blades from moving to a higher pitch angle, ensuring that the propeller operates within the desired range and does not enter a mode where it provides reverse thrust.

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29. What component in the T56 engine coordinator provides reference signals to the electronic TD amplifier that are proportional to the desired TIT?

Explanation

The potentiometer in the T56 engine coordinator provides reference signals to the electronic TD amplifier that are proportional to the desired TIT. A potentiometer is a variable resistor that can adjust the voltage or current in a circuit. In this case, it is used to control the temperature of the engine by providing signals to the TD amplifier, which adjusts the TIT accordingly.

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30. The impeller wheel and tow turbine wheels in the turbine setion of the GTCP165 engine are connected by

Explanation

The impeller wheel and two turbine wheels in the turbine section of the GTCP165 engine are connected by a common shaft. This means that all three components are linked together and rotate as one unit. This arrangement allows for efficient transfer of mechanical energy from the impeller to the turbine wheels, enabling the engine to generate power.

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31. On the 54H60-91 propeller, which is a function of the the pitchlock regulator?

Explanation

The function of the pitchlock regulator on the 54H60-91 propeller is to prevent the blades from decreasing pitch if hydraulic pressure is lost. This means that even if there is a loss of hydraulic pressure, the pitchlock regulator will ensure that the blades maintain their pitch and do not move to a lower angle. This is important for the safe operation of the propeller, as a sudden decrease in pitch could result in a loss of thrust and control.

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32. On the 54H60-91 propeller, which valve, contained in the valve housing, controls the flow of hydraulic fluid to and from the dome assembly?

Explanation

The pilot valve, contained in the valve housing, controls the flow of hydraulic fluid to and from the dome assembly on the 54H60-91 propeller.

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33. On the 54H60-91 propeller, when the backup valve is opened, the hydraulic pressure routed to the governoor pilot valve is used for which operation?

Explanation

When the backup valve is opened on the 54H60-91 propeller, the hydraulic pressure routed to the governor pilot valve is used for the operation of reversing the propeller. This means that the propeller blades can be adjusted to produce reverse thrust, allowing the aircraft to slow down or stop more effectively during landing or taxiing.

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34. On the 54H60-91 propeller, the funcition  of the low pitch stop is to prevent the

Explanation

The low pitch stop on the 54H60-91 propeller is responsible for preventing the dome piston from decreasing the blade angle below 23.3° ± 0.5°. This is important because it ensures that the propeller maintains a minimum blade angle, which is necessary for optimal performance and efficiency. By limiting the range of motion for the dome piston, the low pitch stop helps to regulate the propeller's pitch and control the amount of thrust generated.

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35. On the 54H60-91 propeller, when feathering the propeller, what acts on the mechanical linkage to open the feather actuating valve?

Explanation

When feathering the propeller on the 54H60-91 propeller, the mechanical linkage is acted upon by the manual feather cam to open the feather actuating valve. The manual feather cam is responsible for controlling the movement of the mechanical linkage, allowing it to activate the feather actuating valve and initiate the feathering process.

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36. On an GTCP165 engine, turbine discharge temperature is controlled by the

Explanation

The correct answer is the pneumatic thermostat. On a GTCP165 engine, the turbine discharge temperature is controlled by the pneumatic thermostat. This device regulates the temperature by adjusting the flow of air or gas to the turbine, ensuring that it operates within safe limits. The PMG (Permanent Magnet Generator) and the governor are not directly responsible for controlling the turbine discharge temperature. The fuel flow divider valve is responsible for regulating the fuel flow to the engine, but it does not directly control the turbine discharge temperature. Therefore, the pneumatic thermostat is the correct answer.

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37. On the 54H60-91 propeller, to avoid being crushed after emoving the dome shell during dome piston seal replacement, you should keep your fingers away from the

Explanation

To avoid being crushed after removing the dome shell during dome piston seal replacement on the 54H60-91 propeller, it is important to keep your fingers away from the cam tracks. The cam tracks are the areas where the dome shell moves and rotates, and they can cause serious injury if fingers are caught in them. Therefore, it is necessary to exercise caution and keep a safe distance from the cam tracks to prevent any accidents or harm.

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38. On the 54H60-91 propeller, which component is used in place of a shim plate on the No. 1 blade?

Explanation

The beta segment gear is used in place of a shim plate on the No. 1 blade of the 54H60-91 propeller. This component serves the purpose of adjusting the pitch angle of the blade. A shim plate is typically used to achieve this adjustment, but in this case, the beta segment gear is utilized instead.

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39. On the 54H60-91 propeller, which type of valve opens to allow the output of the standby pump to combine with the output of the main pump?

Explanation

The correct answer is "check". In a 54H60-91 propeller, the check valve opens to allow the output of the standby pump to combine with the output of the main pump. The check valve is designed to allow flow in one direction and prevent backflow in the opposite direction. In this case, it allows the output of the standby pump to flow into the system when needed, ensuring a combined output of both pumps.

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40. For the 54H60-91 propeller to operate in the normal governing mode, the propeller governor control switch must be placed in te NORMAL position and what other conditions must be met?

Explanation

The propeller governor control switch must be placed in the NORMAL position and the throttle must be at or above FLT IDLE. Additionally, the synchrophase master switch must be in the OFF position. These conditions are necessary for the 54H60-91 propeller to operate in the normal governing mode.

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41. On the 54H60-91 propeller, after the new packings are in place during dome piston seal replacement, you need to turn them so  what color faces outward?

Explanation

After replacing the dome piston seal on the 54H60-91 propeller and installing new packings, the packings need to be turned so that the white color faces outward.

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42. The 54H60-91 propeller governor speeder spring tension positions the pilot valve to maintain what percent rpm in the beta range?

Explanation

The correct answer is 109 to 113%. The 54H60-91 propeller governor speeder spring tension is responsible for positioning the pilot valve, which in turn maintains the RPM (rotations per minute) in the beta range. This particular spring tension ensures that the RPM stays within the range of 109 to 113%, allowing for optimal performance and control of the propeller.

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43. On the 54H60-91 propeller, during feathering operation, the feather valve is positioned to meter hydraulic fluid to the

Explanation

During the feathering operation of the 54H60-91 propeller, the feather valve is positioned to meter hydraulic fluid to the forward end of the dome piston. This is because when the propeller is being feathered, the blades need to be rotated to a high pitch angle to minimize drag. By metering hydraulic fluid to the forward end of the dome piston, it allows the blades to rotate to this high pitch angle, effectively feathering the propeller.

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44. On a GTCP165 engine, which component shuts the engine down if the oil pressure drops below the safe minimum operating limit?

Explanation

The oil pressure switch is responsible for shutting down the GTCP165 engine if the oil pressure drops below the safe minimum operating limit. This switch is designed to monitor the oil pressure and send a signal to the engine control system when it falls below the specified threshold. This safety feature ensures that the engine is protected from potential damage caused by insufficient oil pressure, preventing further operation until the issue is resolved.

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45. During normal GTCP165 engine shutdown, what circuit trips to stop the engine?

Explanation

During normal GTCP165 engine shutdown, the 110-percent circuit trips to stop the engine. This circuit is responsible for monitoring the engine's performance and ensuring it does not exceed its maximum operating limit, which is typically 110 percent of its normal operating speed. When the circuit detects that the engine is operating above this limit, it activates a trip mechanism to shut down the engine and prevent any potential damage or failure.

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46. To calculate the required weight change when u use the 192A spectrum analyzer, you will need to plot the data on a

Explanation

The balance chart worksheet is needed to calculate the required weight change when using the 192A spectrum analyzer. This worksheet helps in plotting the data and analyzing the balance sensitivity, which is crucial for determining the weight change accurately. It provides a visual representation of the balance sensitivity chart and allows for easy calculations and adjustments.

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47. On the 54H60-91 propeller, propeller balancing is not required if the propeller imbalance is at or below what level?

Explanation

On the 54H60-91 propeller, propeller balancing is not required if the propeller imbalance is at or below 0.2 IPS. This means that as long as the propeller imbalance is within this level, it is considered acceptable and does not require any further balancing.

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48. What type of sump design is the oil system on a GTCP165 engine?

Explanation

The correct answer is "wet". In a wet sump design, the engine's oil is stored in a separate reservoir within the engine, typically in the bottom of the crankcase. This design allows for easier access and maintenance of the oil system, as well as better lubrication and cooling of the engine components.

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49. On the 54H60-91 propeller, hydraulic fluid is directed from the directed from the pump housing to the barrel assembly through what component?

Explanation

The correct answer is transfer bearing. On the 54H60-91 propeller, hydraulic fluid is directed from the pump housing to the barrel assembly through the transfer bearing. This component plays a crucial role in transferring the hydraulic fluid and ensuring the proper functioning of the propeller system.

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50.
on the 54H60-91 popeller, what is the function of the differential gear train assembly?

Explanation

The function of the differential gear train assembly on the 54H60-91 propeller is to transmit the blade angle movement to the valve housing and drive the propeller governor flyweights. This allows for the adjustment of the blade angle and the regulation of the propeller speed and pitch.

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51. On the 54H60-91 propeller, which valve sets and maintains a pressure differential of about 100 psi between system pressure and the increase- or decrease-pitch pressure?

Explanation

The low-pressure relief valve is responsible for setting and maintaining a pressure differential of about 100 psi between system pressure and the increase or decrease pitch pressure on the 54H60-91 propeller. This valve ensures that the pressure remains at the desired level, preventing any potential damage or malfunction that could occur if the pressure exceeds the specified limit.

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52. On the 54H60-91 propeller, when pessure builds to between 240 adn 280 psi, which valve is unseated and allows the stop levers to retract?

Explanation

When pressure builds to between 240 and 280 psi on the 54H60-91 propeller, the servo valve is unseated and allows the stop levers to retract.

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53. Which switch, located in the control quadrant, activates the 54h-60-91 propeller governor speed bias servo assebly as the throttle is moved into the blight idle gate?

Explanation

The correct answer is "synchrophaser disarming". The synchrophaser is a device that synchronizes the propellers on a multi-engine aircraft to prevent vibration and improve performance. When the throttle is moved into the flight idle gate, the synchrophaser needs to be disarmed to allow the propeller governor speed bias servo assembly to activate and control the propeller speed. Therefore, the switch located in the control quadrant that activates the synchrophaser disarming is the one that is relevant in this situation.

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54. On the 54H60-91 propeller, which pump is used to feather or unfeather the propeller during static propeller operation? 

Explanation

The auxiliary pump is used to feather or unfeather the propeller during static propeller operation on the 54H60-91 propeller.

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55. On the 54H60-91 propeller, if a nick is found on the metal protion of the blade when performing a blade inspection, which tool is used to measure the depth of the damage?

Explanation

The blade checking indicator is used to measure the depth of the damage on the metal portion of the blade. This tool is specifically designed for blade inspections and provides an accurate measurement of any nicks or damage on the blade. It is the most suitable tool for this task compared to other options such as internal calipers, inside micrometers, or rulers with 1/64" increments.

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56. On the 54H60-91 propeller, wen performing blade repair if blade damage was due to propeller blade impact, you must remove all traces of the damage, and then, using emery cloth, remove an additional

Explanation

When performing blade repair on the 54H60-91 propeller, if the blade damage was caused by propeller blade impact, it is necessary to remove all traces of the damage. In addition to that, using emery cloth, an additional 0.002 inch of material should be removed. This ensures that all damage is properly repaired and the propeller blade is restored to its original condition.

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57. When balancing a 54H60-91 propeller, the velocimeter is secured to the forward side of the RGB at what position (as viewed from the rear)?

Explanation

When balancing a 54H60-91 propeller, the velocimeter is secured to the forward side of the RGB at the 9 o'clock position (as viewed from the rear).

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58. What is coordinated by the throttle in the controllable pitch range?

Explanation

The throttle in the controllable pitch range is responsible for coordinating the blade pitch and engine fuel flow. The throttle controls the amount of fuel being delivered to the engine, which in turn affects the engine speed. The blade pitch, on the other hand, controls the angle of the blades, determining the amount of lift and thrust generated. By coordinating the blade pitch and engine fuel flow, the throttle ensures that the engine operates at the desired speed and the blades are adjusted for optimal performance.

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59. When performing a loose blade inspection on the 54H60-91 propeller, fore-and-aft play should not exceed what limit?

Explanation

During a loose blade inspection on the 54H60-91 propeller, it is important to check for fore-and-aft play. This refers to the movement of the blade in the forward and backward direction. The correct answer is 3/4 inch, which means that the fore-and-aft play should not exceed this limit. This measurement ensures that the blade is securely attached and does not have excessive movement, which could lead to potential issues or failures during operation.

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60. When performing the blade tracking inspection on the 54H60-91 propeller, the calculated difference in blade tracks shouldnot exceed what limit?

Explanation

The correct answer is 7/16 inch. When performing the blade tracking inspection on the 54H60-91 propeller, the calculated difference in blade tracks should not exceed this limit. This means that the difference in the position of the blades should not be more than 7/16 inch. This is important for proper functioning and balance of the propeller, ensuring smooth and efficient operation. Any difference beyond this limit could indicate a problem with the propeller and may require adjustment or maintenance.

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61. When the ambient temperature is greater than 65*F and a patch is bonded to the blade fairing, what is the recommended drying time before running the repaired propeller on the aircraft engine?

Explanation

When the ambient temperature is greater than 65°F and a patch is bonded to the blade fairing, it is recommended to wait for 7 days before running the repaired propeller on the aircraft engine. This extended drying time allows for proper curing and bonding of the patch to ensure its strength and durability. Waiting for 7 days ensures that the patch is fully set and ready for operation, reducing the risk of any potential damage or failure during use.

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62. On the 54H60-91 propeller, when repairing a propeller blade heater, what is the maximum number of wires that can be spliced in any one heater?

Explanation

The maximum number of wires that can be spliced in any one heater on the 54H60-91 propeller is 8.

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63. As the 54H60-91 propeller feathers, the output of which pump decreases (drops off)?

Explanation

The main scavenge pump is responsible for removing excess oil from the propeller system. When the 54H60-91 propeller feathers, it means that the blades are rotated to an angle that minimizes drag. This action requires the oil to be pumped out of the system, and the main scavenge pump is responsible for this task. Therefore, if the propeller feathers, the output of the main scavenge pump decreases or drops off.

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64. On the 54H60-91 propeller, what is the minimum psi required to release the feather latches and allow the piston to move forward?

Explanation

The minimum psi required to release the feather latches and allow the piston to move forward on the 54H60-91 propeller is 200.

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65.
on the R391 Dowty propeller, what does the DITU use to monitor itself for malfunctions?

Explanation

The DITU (Dowty Information and Test Unit) on the R391 Dowty propeller uses BIT (Built-In Test) to monitor itself for malfunctions. BIT is a self-diagnostic feature that allows the system to perform tests on its own components and detect any faults or malfunctions. By regularly running BIT, the DITU can identify and report any issues, enabling timely maintenance and preventing potential failures or accidents.

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66. Which is a function of normal governing?

Explanation

Throttle anticipation refers to the ability of a governor to predict and adjust the throttle setting in advance based on the changing load conditions. This function ensures that the engine maintains a constant speed and power output, even when there are sudden changes in the load. Blade phase angles, propeller reindexing, and identical propeller speeds are not directly related to the function of normal governing.

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67. On the 54H60-91 propeller, what prevents engagement of the stationary and rotating retchets at blade angles below 25* and above 55*?

Explanation

The pitchlock control cam prevents engagement of the stationary and rotating ratchets at blade angles below 25* and above 55*.

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68. On the 54H60-91 propeller, between the blade angles of 25* and 55*, what will keep the rotation and stationary ratchets disengaged?

Explanation

To keep the rotation and stationary ratchets disengaged between the blade angles of 25* and 55* on the 54H60-91 propeller, the pitch pressure needs to be adjusted. Increasing or decreasing the pitch pressure will ensure that the ratchets remain disengaged. This adjustment allows for proper functioning of the propeller and prevents any unwanted engagement of the ratchets during operation.

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69. During 54H60-91 propeller dynamic balancing, the propeller balance analyzer receive its two inputs from

Explanation

The correct answer is a velocimeter and the magnetic pulse generator. During the 54H60-91 propeller dynamic balancing, the propeller balance analyzer receives its two inputs from a velocimeter and the magnetic pulse generator. These instruments help measure the speed and rotation of the propeller, allowing the analyzer to determine any imbalances and make adjustments accordingly.

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70. On the 54H60-91 propeller, which cam disarms the NTS system linkage when the throttle is positioned in teh beta range?

Explanation

The correct answer is manual feather. On the 54H60-91 propeller, the manual feather cam is responsible for disarming the NTS (negative torque sensing) system linkage when the throttle is positioned in the beta range. This allows the propeller to be manually feathered, which means adjusting the blades to a high pitch angle to minimize drag and increase efficiency. The manual feather cam ensures that the NTS system does not interfere with this manual control of the propeller.

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71. The pulse generator inputs to the synchrophaser unit are used only

Explanation

When a master propeller is selected, the pulse generator inputs to the synchrophaser unit are used. This suggests that the pulse generator inputs are specifically designed to synchronize the propellers of multiple engines.

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72. The modulating and shutoff valve on a GTCP165 engine will be fully open at what percent rpm?

Explanation

The modulating and shutoff valve on a GTCP165 engine will be fully open at 90% RPM. This means that when the engine is running at 90% of its maximum speed, the valve will be completely open, allowing maximum airflow and fuel into the engine. At lower RPMs, the valve will be partially closed to regulate the flow of air and fuel.

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73. On the 54H60-91 propeller, which pump assists the main pressure pump when large blade angle movements are required?

Explanation

The standby pressure pump assists the main pressure pump on the 54H60-91 propeller when large blade angle movements are required. This pump helps to maintain the necessary pressure for the propeller system to function properly during these movements.

Submit
74. Which R391 Dowty propeller component routes engine oil to and from the cylinder and piston?

Explanation

The correct answer is beta tube. The beta tube is a component of the R391 Dowty propeller that is responsible for routing engine oil to and from the cylinder and piston. It plays a crucial role in ensuring proper lubrication and functioning of the engine components.

Submit
75. On the 54H60-91 propeller, in the mechanical governing mode, what causes the pilot valve to move and set propeller speed?

Explanation

In the mechanical governing mode of the 54H60-91 propeller, the pilot valve is moved and the propeller speed is set by the speeder spring or flyweights.

Submit
76. How many slave channels are contained on the master synchrophaser board in the synchrophaser unit?

Explanation

The correct answer is one. This means that there is only one slave channel contained on the master synchrophaser board in the synchrophaser unit.

Submit
77. What R391 Dowty propeller assembly part provides an aerodynamic faring over the aft section of the hub?

Explanation

The backplate of the R391 Dowty propeller assembly provides an aerodynamic faring over the aft section of the hub. The backplate is responsible for streamlining the airflow and reducing drag at the rear of the propeller hub. It helps improve the overall performance and efficiency of the propeller system by ensuring smooth airflow and reducing turbulence.

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78. Which component controls the R391 Dowty propeller blade angle by direction engine oil flow through the beta tube to the cylinder and piston?

Explanation

The PCU (Propeller Control Unit) is the component that controls the R391 Dowty propeller blade angle by directing engine oil flow through the beta tube to the cylinder and piston. It regulates the pitch of the propeller blades, allowing for efficient operation and control of the aircraft's speed and thrust. The other options mentioned (GBE valve, PUAD, GMAD) do not have the specific function of controlling the propeller blade angle.

Submit
79. For the R391 Dowty propeller, during flight operation, what directs the PCU to meter fine and coarse pitch oil to maintain 1020.7 rpm?

Explanation

FADEC stands for Full Authority Digital Engine Control. It is a system used in aircraft to control the engine's performance. In the case of the R391 Dowty propeller, the FADEC system is responsible for directing the PCU (Propeller Control Unit) to meter fine and coarse pitch oil to maintain the desired RPM (1020.7). The FADEC system continuously monitors and adjusts various parameters, such as fuel flow, propeller pitch, and engine speed, to optimize the engine's performance during flight operations.

Submit
80. Mechanical governing provides the foundation fo rwhat other propeller governing modes?

Explanation

Mechanical governing provides the foundation for normal and synchrophasing propeller governing modes. Normal governing mode is used to control the propeller pitch to maintain a constant RPM, while synchrophasing mode is used to synchronize the propeller speeds on multi-engine aircraft. The other options, beta range and alpha range, are not directly related to mechanical governing.

Submit
81. On the 54H60-91 propeller speed bias motor, when the control winding boltage is different from the reference-winding voltage, what results?

Explanation

When the control winding voltage is different from the reference-winding voltage on the 54H60-91 propeller speed bias motor, the speed bias motor rotates and increases or decreases the blade angle.

Submit
82. For the R391 Dowty propeller, the feather valve is located inside the

Explanation

The correct answer is PCU. PCU stands for Propeller Control Unit, which is responsible for controlling the pitch of the propeller blades. The feather valve, in this case, is located inside the PCU. The feather valve is an important component that allows the pilot to feather the propeller, which means to rotate the blades parallel to the airflow to reduce drag in case of an engine failure or shutdown.

Submit
83. For the R391 Dowty propeller, what component provides blade angle feedback to the FADEC by two RVDT?

Explanation

The correct answer is PCU. The PCU, or Propeller Control Unit, is the component that provides blade angle feedback to the FADEC (Full Authority Digital Engine Control) by two RVDTs (Rotary Variable Differential Transformers). The RVDTs measure the position of the propeller blades and provide this information to the FADEC, which then adjusts the propeller pitch accordingly. This allows for precise control of the propeller and optimal engine performance.

Submit
84.
for the R391 Dowty propeller, what component(s) relay propeller blade angle to the FADEC units
 

Explanation

The R391 Dowty propeller uses the RVDTS (Rotary Variable Differential Transformer System) to relay propeller blade angle information to the FADEC (Full Authority Digital Engine Control) units. The RVDTS is a sensor system that measures the position of the propeller blades and provides this data to the FADEC units, allowing them to adjust the propeller pitch as needed for optimal engine performance.

Submit
85. On the 54H60-91 propeller, during an underspeed condition, what moves the pilot valve?

Explanation

During an underspeed condition on the 54H60-91 propeller, the speeder spring moves the pilot valve. The purpose of the speeder spring is to maintain a constant propeller speed by adjusting the pitch of the propeller blades. When the propeller speed decreases below the desired level, the speeder spring activates and moves the pilot valve to increase hydraulic pressure, adjusting the pitch and increasing the propeller speed back to the desired level.

Submit
86. During normal governign operation, what stabilizes the propeller governor during rapid throttle movements?

Explanation

The throttle anticipation circuit is responsible for stabilizing the propeller governor during rapid throttle movements. This circuit anticipates the throttle movements and adjusts the propeller pitch accordingly to maintain a stable speed. It helps to prevent overspeed or underspeed conditions by quickly responding to throttle changes and making the necessary adjustments. The tachometer generator, feedback potentiometer, and speed stabilization circuit may play a role in the propeller governor's operation, but they are not specifically designed to stabilize the governor during rapid throttle movements.

Submit
87. Which two cams, on the alpha shaft, control the 54H60-91 propeller unfeathering operation?

Explanation

The correct answer is manual feather and beta set. These two cams on the alpha shaft control the 54H60-91 propeller unfeathering operation. The manual feather cam is responsible for initiating the unfeathering process, while the beta set cam controls the pitch angle of the propeller blades during unfeathering.

Submit
88. The fuel governing check switches are used to reset the propeller governor t what percentage of rpm in the alpha range?

Explanation

The fuel governing check switches are used to reset the propeller governor to 106% of RPM in the alpha range. This means that when the switches are activated, the propeller governor will adjust the fuel flow to increase the RPM of the propeller to 106% of its normal operating speed. This may be necessary in certain situations where additional power is required, such as during takeoff or climbing.

Submit
89. On the 54H60-91 propeller, during beta range operation, what moves the pilot valve?

Explanation

The pilot valve on the 54H60-91 propeller is moved by cams and mechanical linkage during beta range operation. This means that the movement of the valve is controlled by a system of cams and mechanical linkages, rather than by the throttle or hydraulic pressure. The cams and mechanical linkage system is designed to regulate the movement of the pilot valve in order to control the propeller pitch and optimize performance during beta range operation.

Submit
90. On an GTCP165 engine, the accessory drive section forward housing provides mounts for the components, which include furel control unit, oil pump assembly, oil filter element, vane-axial fan assembly, and

Explanation

The accessory drive section forward housing on a GTCP165 engine provides mounts for various components, including the fuel control unit, oil pump assembly, oil filter element, vane-axial fan assembly, and air/oil cooler. This suggests that the air/oil cooler is one of the components mounted on the accessory drive section forward housing.

Submit
91. On the 54H60-91 propeller, which valve is a backup in case the feather valve fails during feathering operation?

Explanation

The pilot valve is a backup in case the feather valve fails during feathering operation. It is responsible for controlling the flow of hydraulic fluid to the feather actuating cylinder, which is necessary for feathering the propeller. If the feather valve fails, the pilot valve can be used to manually operate the feathering process and ensure that the propeller is properly feathered.

Submit
92. On the 54H60-91 propeller, which component is the primary electical ground for energizing the feather override holding coil?

Explanation

The pressure cutout switch is the primary electrical ground for energizing the feather override holding coil on the 54H60-91 propeller. This switch is responsible for cutting off the electrical power to the feather solenoid when the propeller reaches a certain pressure, preventing the propeller from feathering unintentionally. By grounding the feather override holding coil, the pressure cutout switch ensures that the propeller remains in the desired position and prevents any unwanted feathering.

Submit
93. On an GTCP165 engine, air is compressed by the single-stage centrifugal compressor assembly, and then discharged into

Explanation

The correct answer is a vaned deswirl assembly. On a GTCP165 engine, air is compressed by the single-stage centrifugal compressor assembly and then discharged into a vaned deswirl assembly. This assembly helps to remove any swirl or turbulence in the compressed air, ensuring smooth and efficient flow before it enters the turbine plenum. The diffuser case, turbine plenum, and load control valve are not directly involved in the process of removing swirl or turbulence from the compressed air.

Submit
94. What R391 Dowty propeller component translates piston and shaft movement to vary propeller blade angle?

Explanation

The operating pin is the correct answer because it is the component that translates the piston and shaft movement to vary the propeller blade angle. The operating pin is responsible for connecting the piston and shaft to the propeller hub, allowing for the adjustment of the blade angle. This movement of the operating pin controls the pitch of the propeller blades, which in turn affects the performance and efficiency of the propeller.

Submit
95. On a GTCP165 engine, which signals are used by the furl control unit to control engine operation?

Explanation

The furl control unit on a GTCP165 engine uses engine speed and pneumatic thermostat (load control) air pressure signals to control engine operation. These signals help the control unit adjust the fuel flow and other parameters to maintain the desired engine speed and load control.

Submit
96. On the 54H60-91 propeller, during beta range operation, the rotation of which cam moves the mechanical linkage to center the governor pilot valve?

Explanation

During beta range operation, the rotation of the beta follow-up cam moves the mechanical linkage to center the governor pilot valve. This ensures that the propeller is properly controlled and maintains the desired pitch angle. The beta follow-up cam is specifically designed to adjust the position of the governor pilot valve based on the propeller's beta range operation.

Submit
97. Where is the pickup portion of the pulse generator located?

Explanation

The pickup portion of the pulse generator is located in the pump housing.

Submit
98. Which board in the synchrophaser unit receives input signals that are compared together, modified, and used to control the speed bias motors?

Explanation

The power amplifier board in the synchrophaser unit receives input signals that are compared together, modified, and used to control the speed bias motors. This board amplifies the signals and provides the necessary power to drive the motors, allowing for precise control of the speed bias.

Submit
99. On a GTCP165 engine, the speed switch control does not control the engine during

Explanation

The speed switch control on a GTCP165 engine does not control the engine during no-load operation. This means that the speed switch control is not responsible for regulating the engine's speed when it is running without any load or external resistance. During no-load operation, the engine is not required to perform any specific tasks or provide power to any equipment, so the speed switch control is not needed to adjust the engine's speed.

Submit
100. On the 54H60-91 propeller, after the NTS system actuator rod positins the mechanical linkage in the valve housing when a negative torque condition occurs, what component is shifted?

Explanation

When a negative torque condition occurs on the 54H60-91 propeller, the NTS system actuator rod positions the mechanical linkage in the valve housing. In this situation, the component that is shifted is the feather valve.

Submit
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The term "No. 320 grit" refers to which feature of sandpaper?
Which 54H60-91 propeller subassembly transmits engine torque to the...
When attempting to unfeather the 54H60-91 propeller in flight, where...
The pneumatic air bled from the small gas turbine engine cannot be...
On the 54H60-91 propeller, if the main filter becomes clogged, which...
The purpose fo the 54H60-91 propeller pitchlock assembly is to prevent
Besides maintaing the optimum blade phase angle relationship between...
On the 54H60-91 propeller, which pitchlock component mechanically...
On the 54H60-91 propeller, which component provides a means for...
On the 54H60-91 propeller, during normal porpeller operation, the...
If the master propeller fails during synchrophaser governing, the...
When you perform a static blade transition check and abnormal noises...
On a GTCP165 engine shutdown, what valve closes to ensure fuel-flow is...
On a GTCP165 engine oil system, air that leaks past various oil seals...
On the 54H60-91 propeller, which component delivers the actual...
On the 54H60-91 propeller, the output of what pump is sufficient to...
To reduce the noise and vibration levels, synchrophasing mode of...
On the 54H60-91 propeller, during alpha range operation, which cam...
On the 54H60-91 propeller, during feather operation, between...
The master synchrophaser board located int the synchrophaser unit...
How much change in rpm does the compensating network in the...
Which type fo special inspection can be used to find minute cracks on...
When used for ground operation, the SGT engine can be installed on
On the 54H60-91 propeller, which dome assembly part allow the rotating...
On the 54H60-91 propeller, when the throttle is moved to the GROUND...
The condition lever GND STOP position is only effective on the ground...
On the 54H60-91 propeller, what forces the stop levers on the low...
On the 54H60-91 propeller, what function is a task of the low pitch...
What component in the T56 engine coordinator provides reference...
The impeller wheel and tow turbine wheels in the turbine setion of the...
On the 54H60-91 propeller, which is a function of the the pitchlock...
On the 54H60-91 propeller, which valve, contained in the valve...
On the 54H60-91 propeller, when the backup valve is opened, the...
On the 54H60-91 propeller, the funcition  of the low pitch stop...
On the 54H60-91 propeller, when feathering the propeller, what acts on...
On an GTCP165 engine, turbine discharge temperature is controlled by...
On the 54H60-91 propeller, to avoid being crushed after emoving the...
On the 54H60-91 propeller, which component is used in place of a shim...
On the 54H60-91 propeller, which type of valve opens to allow the...
For the 54H60-91 propeller to operate in the normal governing mode,...
On the 54H60-91 propeller, after the new packings are in place during...
The 54H60-91 propeller governor speeder spring tension positions the...
On the 54H60-91 propeller, during feathering operation, the feather...
On a GTCP165 engine, which component shuts the engine down if the oil...
During normal GTCP165 engine shutdown, what circuit trips to stop the...
To calculate the required weight change when u use the 192A spectrum...
On the 54H60-91 propeller, propeller balancing is not required if the...
What type of sump design is the oil system on a GTCP165 engine?
On the 54H60-91 propeller, hydraulic fluid is directed from the...
On the 54H60-91 popeller, what is the function of the differential...
On the 54H60-91 propeller, which valve sets and maintains a pressure...
On the 54H60-91 propeller, when pessure builds to between 240 adn 280...
Which switch, located in the control quadrant, activates the 54h-60-91...
On the 54H60-91 propeller, which pump is used to feather or unfeather...
On the 54H60-91 propeller, if a nick is found on the metal protion of...
On the 54H60-91 propeller, wen performing blade repair if blade damage...
When balancing a 54H60-91 propeller, the velocimeter is secured to the...
What is coordinated by the throttle in the controllable pitch range?
When performing a loose blade inspection on the 54H60-91 propeller,...
When performing the blade tracking inspection on the 54H60-91...
When the ambient temperature is greater than 65*F and a patch is...
On the 54H60-91 propeller, when repairing a propeller blade heater,...
As the 54H60-91 propeller feathers, the output of which pump...
On the 54H60-91 propeller, what is the minimum psi required to release...
On the R391 Dowty propeller, what does the DITU use to monitor itself...
Which is a function of normal governing?
On the 54H60-91 propeller, what prevents engagement of the stationary...
On the 54H60-91 propeller, between the blade angles of 25* and 55*,...
During 54H60-91 propeller dynamic balancing, the propeller balance...
On the 54H60-91 propeller, which cam disarms the NTS system linkage...
The pulse generator inputs to the synchrophaser unit are used only
The modulating and shutoff valve on a GTCP165 engine will be...
On the 54H60-91 propeller, which pump assists the main pressure pump...
Which R391 Dowty propeller component routes engine oil to and from the...
On the 54H60-91 propeller, in the mechanical governing mode, what...
How many slave channels are contained on the master synchrophaser...
What R391 Dowty propeller assembly part provides an aerodynamic faring...
Which component controls the R391 Dowty propeller blade angle by...
For the R391 Dowty propeller, during flight operation, what directs...
Mechanical governing provides the foundation fo rwhat other propeller...
On the 54H60-91 propeller speed bias motor, when the control winding...
For the R391 Dowty propeller, the feather valve is located inside the
For the R391 Dowty propeller, what component provides blade angle...
For the R391 Dowty propeller, what component(s) relay propeller blade...
On the 54H60-91 propeller, during an underspeed condition, what moves...
During normal governign operation, what stabilizes the propeller...
Which two cams, on the alpha shaft, control the 54H60-91 propeller...
The fuel governing check switches are used to reset the propeller...
On the 54H60-91 propeller, during beta range operation, what moves the...
On an GTCP165 engine, the accessory drive section forward housing...
On the 54H60-91 propeller, which valve is a backup in case the feather...
On the 54H60-91 propeller, which component is the primary...
On an GTCP165 engine, air is compressed by the single-stage...
What R391 Dowty propeller component translates piston and shaft...
On a GTCP165 engine, which signals are used by the furl control unit...
On the 54H60-91 propeller, during beta range operation, the rotation...
Where is the pickup portion of the pulse generator located?
Which board in the synchrophaser unit receives input signals that are...
On a GTCP165 engine, the speed switch control does not control the...
On the 54H60-91 propeller, after the NTS system actuator rod positins...
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