2A651 Vol 4 Self Test

Mechanical governing provides the foundation for two other propeller governing modes, namely electrical governing and hydraulic governing. Mechanical governing involves the use of mechanical linkages and mechanisms to control the pitch of the propeller blades. This mode forms the basis for the development of more advanced governing systems that utilize electrical or hydraulic systems to control the propeller pitch.

The high pressure relief valve is responsible for limiting the hydraulic system pressure to 1300 psi above the pressurized sump pressure. This valve is designed to open and release excess pressure when it reaches a certain threshold, preventing damage to the hydraulic system. It ensures that the pressure does not exceed a safe limit, protecting the system from potential failures or leaks.

The stop ring is the dome assembly part that prevents the cam bearing rollers from bottoming out in the track slopes. It acts as a barrier or limit to ensure that the rollers do not reach the bottom of the track slopes, thereby preventing any potential damage or malfunction.

Intense vibrations produced by an unbalanced propeller can potentially cause damage to an engine mount or a propeller shaft. These vibrations can be strong enough to cause cracks or even break these components.

The angular position provided by the magnetic pulse generator is measured in angle degrees. This means that the measurement is being taken in terms of the angle formed between the reference point and the position being measured. The magnetic pulse generator likely uses magnetic pulses to determine the angular position, and the measurement is given in degrees to provide a specific and standardized unit for the angular position.

The synchrophaser unit is the component that corrects the propellers to obtain the best phase angle relationship between the master and slaves. It ensures that the propellers are synchronized and working in harmony, optimizing their performance and efficiency. The synchrophaser unit adjusts the phase angle to minimize any imbalances or discrepancies between the propellers, allowing for smooth and coordinated operation.

When a synchrophaser is replaced, indexing the synchrophaser system is normally required. This is because the synchrophaser is a crucial component of the system that ensures synchronization and coordination between different devices. Replacing the synchrophaser may disrupt the system's functionality, and indexing is necessary to recalibrate and align the new synchrophaser with the rest of the system.

If the impact caused the propeller to stop rotating, the correct action to take would be to remove and replace the propeller assembly.

The leading edge of the propeller blades is protected by a nickel leading edge guard. This guard is specifically designed to prevent damage to the propeller blades, such as erosion or impact from foreign objects. Nickel is a durable and corrosion-resistant material, making it suitable for this purpose. It helps to maintain the integrity and performance of the propeller blades by shielding them from potential hazards during operation.

The direction in which you file a blade depends on where the damage is on the blade.

The piston sleeve is the dome assembly part that provides a sliding sealing surface between the piston and low-pitch stop. It acts as a barrier between the two components, ensuring a tight seal and preventing any leakage or loss of pressure. This helps to maintain the efficiency and functionality of the dome assembly system.

The correct answer is "dome, barrel, and control." The spinner and afterbody assemblies enclose the propeller assembly consisting of the dome, barrel, and control components.

Dome piston seals have to be replaced because they are a time change item. This means that they have a limited lifespan and need to be replaced periodically to ensure the proper functioning of the system. Over time, these seals can wear out or become damaged, leading to leaks or other issues. Therefore, regular replacement is necessary to maintain the efficiency and reliability of the system.

The power transmitted by the brush block assembly is used to supply the propeller with the capability of preventing ice formation. This is important because ice buildup on the propeller can disrupt its performance and potentially lead to dangerous situations. By supplying the propeller with anti-ice capability, the brush block assembly helps ensure that the propeller remains ice-free and can operate efficiently.

The predetermined overspeed setting that allows the ratchets to engage is 103.5%.

The PB/PMS (Power Balance/Power Management System) is being installed on newer aircraft to ensure proper dynamic balancing. This system helps in maintaining the balance of power between different engines or components of the aircraft, ensuring optimal performance and reducing vibrations. By monitoring and managing the power distribution, the PB/PMS helps to prevent any imbalance that could lead to mechanical issues or decreased efficiency.

The blade heater is not visible because it is an internal component of a device or system. However, it can be located by using a multimeter set to ohms. The multimeter measures resistance, so by connecting the probes to the appropriate terminals or contacts related to the blade heater, it is possible to determine its presence and functionality. The resistance reading on the multimeter will indicate whether the blade heater is functioning properly or not.

When propellers are rotating at different speeds, the noise and vibration levels tend to rise and fall. This is because the imbalance in rotational speeds causes uneven forces and disturbances in the propellers, resulting in increased noise and vibration.

The primary manifold contains 6 fuel nozzles.

The correct answer is visual, dimensional, and special. When inspecting a propeller, visual inspection is important to identify any visible damage or wear. Dimensional inspection involves taking measurements to ensure that the propeller meets the required specifications. Special inspection techniques may be used for specific purposes, such as using purple dye to detect cracks or other defects. These methods together provide a comprehensive inspection of the propeller.

The thermocouple harness contains 6 thermocouples.

The pressure switch is the component that gives an indication to the aircrew if the GBE valve is not in flight position for the flight condition. This switch is designed to detect the pressure in the system and provide a signal if it falls below or exceeds the desired range. In this case, if the GBE valve is not in the correct position, it would result in abnormal pressure readings, triggering the pressure switch and alerting the aircrew of the issue.

Controllable pitch refers to the ability of adjusting the angle of the propeller blades while the engine is running. The coordinator protractor is a device used to measure the angle of the blades. The correct answer suggests that controllable pitch can occur within a range of 0 to 34 degrees on the coordinator protractor. This means that the blades can be adjusted to various angles within this range, allowing for better control and optimization of the propeller's performance.

The purpose of the afterbodies is to streamline the airflow into the engine. Afterbodies are designed to reduce drag and turbulence caused by the engine exhaust flow, allowing for a smoother and more efficient flow of air into the engine. By streamlining the airflow, the afterbodies help improve the overall performance and efficiency of the engine.

The output of the velocimeter that is sent to the analyzer is measured in IPS (Inches Per Second). This unit of measurement indicates the speed or velocity at which the object being measured is moving. The velocimeter records the movement and converts it into a measurement in inches per second, providing information about the velocity of the object.

The velocimeter should be secured horizontally at 9 o'clock on the forward side of the RGB. This means that it should be positioned in a way that the instrument is parallel to the ground and the 9 o'clock position on a clock face. This positioning allows for accurate measurement of velocity and ensures that the instrument is properly aligned with the direction of movement.

The only differences between the various types of SGT engines are the changes they require to adapt to different power sources. This means that the different types of SGT engines may have different configurations or adjustments in order to operate with different power sources, such as natural gas, diesel, or other fuels.

If the repair depth exceeds the allowable limits after the metal damage is repaired, the best course of action is to R2 (replace and reinstall) the entire assembly. This means that the damaged assembly should be completely replaced with a new one, ensuring that the repair depth remains within the allowable limits. This is necessary to maintain the structural integrity and safety of the equipment.

Blade heater damage usually results from a combination of overheating and foreign object damage (FOD). Overheating can cause the blade heater to become damaged due to excessive heat, leading to malfunctions or failure. Additionally, FOD, such as debris or foreign objects, can cause physical damage to the blade heater, affecting its performance and potentially causing further damage. Therefore, the correct answer is overheating and FOD damage.

Labeling the end of the velocimeter cables with its respective propeller number helps to ensure that the cable ends are connected properly. This is important because if the cables are not connected correctly, it can lead to inaccurate readings from the velocimeter. By labeling the cables, it becomes easier to identify and match the correct cable with the corresponding propeller, minimizing the chances of incorrect connections. This ensures that the velocimeter is functioning accurately and providing reliable data for balancing the propellers.

The adjustment screw prevents the schedule valve from starving the engine at high altitudes. By adjusting the screw, the flow of fuel can be regulated to ensure that the engine receives the necessary amount of fuel for proper combustion, even at high altitudes where the air density is lower. This allows the engine to maintain optimal performance and prevent any potential damage or loss of power due to fuel starvation.

The correct answer is "dimensional." In order to check the pulse generator for propeller clearance, a dimensional inspection method would be used. This method involves measuring the dimensions of the pulse generator to ensure that it meets the required specifications and has the appropriate clearance for the propeller. Other inspection methods such as special, purple dye, or blade indicator would not be suitable for this specific task.

The air that is bled from the SGT engine can be used to operate large class equipment, such as air compressors or generators. It can also be used to age certain materials or components, as well as to remove snow and ice from aircraft surfaces.

The propeller deicing duty cycle refers to the pattern of time intervals during which the deicing system is activated and deactivated. In this case, the correct answer is "12 seconds on, 78 seconds off", indicating that the deicing system is turned on for 12 seconds and then turned off for 78 seconds. This duty cycle allows for periodic activation of the deicing system to prevent ice buildup on the propeller while allowing for longer intervals of non-operation.

Constant speed occurs between the degrees 34 and 90 on the coordinator protractor. This means that when an object is moving at a constant speed, its angle on the protractor will remain within this range.

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The condition lever is released to the run position when the RPM reaches light off. This indicates that the engine has reached a sufficient speed for ignition and is ready to operate normally. Releasing the condition lever at this point allows for the fuel flow to be adjusted and the engine to continue running smoothly.

When the governor pilot valve meters fluid to the increase-pitch side of the dome piston during an underspeed condition, it causes a decrease in speed. This is because the increase in fluid to the increase-pitch side of the dome piston will result in a decrease in the pitch of the propeller blades. As a result, the propeller will generate less thrust, leading to a decrease in speed.

The rotor assembly is the correct answer because it is the only major moving part in the SGT engine. The compressor assembly, turbine assembly, and fan assembly are all components of the rotor assembly and rely on it for their movement. Therefore, the rotor assembly is the primary moving part responsible for generating power and driving the engine.

In order for the PMG (Permanent Magnet Generator) to supply electrical power for starting, two switches must be closed. The range of 95-110% indicates the voltage range within which these switches must be closed. This means that the switches need to be closed when the voltage is between 95% and 110% of the nominal voltage. This ensures that the PMG is operating at the correct voltage level before it can supply electrical power for starting.

The correct answer is 1 drop/45 sec. This means that during the fluid leakage inspection, the hydraulic fluid leak from the control assembly should not exceed 1 drop every 45 seconds, whether the assembly is running or static. This standard helps ensure that the control assembly is functioning properly and does not have any significant fluid leaks that could affect its performance or safety.

During beta/ground operation, the normal ground idle propeller speed is 1,010.5 rpm.

The main, standby, and main scavenge pumps are driven by propeller rotation. This means that the pumps are powered by the rotational movement of the propeller. As the propeller rotates, it transfers energy to the pumps, allowing them to function and perform their respective tasks.

The auxiliary pressure and auxiliary scavenge pumps are able to complete the feathering process when the main and standby pumps stop operating because they are electrically driven. This means that they do not rely on the main or standby pumps for power and can continue to function independently.

Installing a "patch" on the blade is the difference between repairing a weather crack that is less than 0.070 inch and repairing one that exceeds the limit. This suggests that when the crack is smaller than 0.070 inch, it can be repaired without the need for a patch. However, when the crack exceeds this limit, a patch needs to be installed on the blade to properly repair it.

The correct answer is "extension." The extension part of the barrel assembly provides safe seats for the front and rear cones and also supports the control assembly. It plays a crucial role in ensuring the stability and proper functioning of the barrel assembly.

The correct answer is CTM. CTM stands for Constant Torque Motor, which is a component of the propeller control system. When the overspeed exceeds 103.5% rpm, the CTM will activate and cause the blade angle to decrease. This is done to reduce the propeller's pitch and prevent further increase in speed. The CTM is responsible for regulating the blade angle and maintaining the desired propeller speed.

The sump relief valve is the correct answer because it is responsible for maintaining a pressure differential between the atmospheric and pressurized sumps. This valve ensures that the pressure in the sumps remains at a safe and stable level by relieving any excess pressure.

When more oil is delivered to the aft side of the piston, the piston moves forward towards max reverse. This is because the increased oil pressure on the aft side creates a force that pushes the piston in the forward direction.

The correct answer is 240-280. This range of psi is where the servo valve is unseated, meaning that it is opened or released, allowing the wedge to move. Any psi below 240 or above 280 would not cause the servo valve to unseat and the wedge to move.