Kc-135r Engine Run Operating Limits Quiz

The correct answer is 13-35 PSI. This range represents the acceptable oil pressure limits for an engine operating at ground idle. The oil pressure needs to be maintained within this range to ensure proper lubrication and functioning of the engine components. If the oil pressure falls below 13 PSI or exceeds 35 PSI, it could indicate a problem with the engine's oil system and may require further investigation or maintenance.

A fuel flow reading greater than 680 PPH before the light goes out indicates a potential hot start. This is because a hot start occurs when there is too much fuel being introduced into the combustion chamber, causing the engine to overheat. The high fuel flow reading suggests that there may be an issue with the fuel system, leading to a potential hot start.

The correct answer is 11-90 PSI because this range represents the acceptable operating pressure for oil in a system. The lower limit of 11 PSI ensures that there is enough pressure to properly lubricate the engine components, while the upper limit of 90 PSI prevents excessive pressure that could cause damage to the system. This range allows for optimal performance and protection of the engine.

The hydraulic pressure for the reserve brake accumulator should read 3100 PSI. This pressure is necessary to ensure proper functioning of the reserve brake system. It is important to maintain the correct pressure to ensure that the reserve brake can be activated effectively in case of an emergency. A pressure of 3100 PSI provides the optimal balance between power and control, allowing the reserve brake to function efficiently without causing any damage to the system.

The correct answer is 2850-3200 PSI. This range represents the engine operating limits for left and right hydraulic pressure at ground idle. It specifies the minimum and maximum values within which the pressure should be maintained to ensure proper functioning of the hydraulic system.

The maximum N1 RPM refers to the maximum rotational speed of the low-pressure compressor section of a jet engine. In this case, the correct answer is 102%. This means that the N1 RPM can reach up to 102% of its normal operating speed.

The maximum N2 RPM refers to the maximum rotational speed of the second-stage compressor in a gas turbine engine. Among the given options, 105% is the closest value to the maximum N2 RPM.

The low oil pressure light illuminates at 11 PSI because this is the minimum pressure at which the engine can still be adequately lubricated. If the oil pressure drops below this level, it can cause damage to the engine components. Therefore, the low oil pressure light serves as a warning to the driver to address the issue and prevent potential engine damage.

The maximum EGT at start is 725°C. This indicates the highest temperature that the exhaust gas temperature can reach during the starting process. It is important to monitor this temperature to ensure that it does not exceed the maximum limit, as excessive heat can cause damage to the engine components.

The correct answer is 2850-3200 PSI. This is the suggested range for the hydraulic pressure of the left and right system accumulators. It is important for the pressure to be within this range in order to ensure proper functioning of the system.

When the hydraulic quantity for both the left and right systems lowers to 2 gallons, it is necessary to shut down the engine. This indicates that the hydraulic systems are running low on fluid and may not be able to function properly. By shutting down the engine, it prevents further usage of the hydraulic systems and potential damage or failure due to lack of hydraulic fluid.

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In extreme cold temperatures, the viscosity of oil increases, causing it to become thicker and less fluid. This increased viscosity can lead to a temporary increase in oil pressure, causing it to peak to the maximum level indicated on the pressure gauge, also known as full scale. This is because the thicker oil takes longer to flow through the engine, creating higher pressure readings. Once the engine warms up and the oil thins out, the pressure will return to normal levels.

This question is asking at what fuel quantity should the engines be shut down for an idle run. The correct answer is 15,000. This means that if the fuel quantity drops below 15,000, the engines should be shut down.

When operating all 4 engines at 75% N2, the engines should be shut down when the fuel quantity drops below 40,000. This indicates that the engines should not continue running if the fuel level falls below this threshold, as it could lead to a fuel shortage and potential engine failure.

The correct answer is 175°C. When the oil temperature exceeds this threshold, it indicates that the engine is operating at a dangerously high temperature. This can lead to overheating and potential damage to the engine components. To prevent further damage, it is necessary to shut down the engine and allow it to cool down before resuming operation.

The correct answer is 3.75-4.25 Gallons. This range represents the hydraulic quantity for the left system. It indicates that the left system should have a minimum of 3.75 gallons and a maximum of 4.25 gallons of hydraulic fluid. This range ensures that the system has enough fluid to operate effectively without exceeding its capacity.

The correct answer is 400-800 PPH. This range indicates the fuel flow rate at idle, which can vary depending on the specific aircraft and engine. Idle fuel flow typically falls within this range to ensure proper engine operation and fuel efficiency while the aircraft is stationary or operating at low speeds.

After performing a 40% N2 Cross Check, the EGT (Exhaust Gas Temperature) should read below 600°C. This indicates that the temperature of the exhaust gases is within the acceptable range and not exceeding the specified limit.

The correct answer is 4.0-4.5 Gallons. This is because the hydraulic quantity for the right system should be within this range.

The correct answer is 870°C. When the Exhaust Gas Temperature (EGT) reaches this temperature, the amber caution light illuminates. This serves as a warning sign for the operator or driver that the EGT has reached a potentially high level, indicating a possible issue with the engine or exhaust system. It is important to monitor and address this temperature to prevent any further damage or malfunction.

Icing conditions are defined as when the temperature is 50°F and visible moisture is present. This means that when the temperature is at or below 50°F and there is moisture in the form of rain, snow, or fog, the conditions are conducive to the formation of ice on surfaces such as roads, aircraft, or power lines. This can lead to hazardous situations and requires caution and appropriate measures to prevent accidents or damage.

The EGT (Exhaust Gas Temperature) at max continuous operation can read above 870°C for a limit of 5 minutes. This means that the engine can tolerate temperatures above 870°C but only for a maximum duration of 5 minutes. If the temperature exceeds this limit, it could potentially cause damage to the engine. Therefore, it is important to monitor and control the EGT during operation to prevent any overheating issues.

The oil temperature at continuous operation is 160°C. This temperature is ideal for maintaining the proper viscosity and lubrication properties of the oil, ensuring efficient and reliable operation of the machinery or equipment. It is important to monitor and control the oil temperature within this range to prevent overheating and potential damage to the system.

At breakaway, the fuel flow will read 1000 PPH. This means that the rate at which fuel is flowing through the system will be 1000 pounds per hour.

The correct answer is 16-22%. This range represents the operating limits for N1 RPM (rotations per minute) at ground idle. N1 RPM refers to the rotational speed of the low-pressure compressor section of an aircraft engine. Ground idle refers to the lowest RPM setting at which the engine can sustain operation while the aircraft is on the ground. Therefore, the correct answer indicates that the N1 RPM should be maintained between 16% and 22% during ground idle.

The maximum EGT (Exhaust Gas Temperature) when engines are TRT (Takeoff Rated Thrust) or above idle is 905°C. This temperature is the highest that the exhaust gases can reach during these engine conditions. It is important to monitor and control EGT to ensure the engine operates within safe limits and prevents any potential damage or failure.

The fuel flow at breakout refers to the rate at which fuel is flowing through the system once the fuel pump pressure reaches a certain level. The given answer range of 300-680 PPH suggests that the fuel flow can vary between these values. This indicates that the fuel flow at breakout is not fixed and can fluctuate within this range depending on factors such as engine conditions and fuel system settings.

The low oil pressure light will illuminate when the scavenge oil filters are clogged. Scavenge oil filters are responsible for removing debris and contaminants from the oil in the engine. When these filters become clogged, they can restrict the flow of oil and cause a drop in oil pressure. This drop in pressure triggers the low oil pressure light to come on, signaling a potential issue with the oil system.

The correct answer is 400-800 PSI. This range represents the engine operating limits for fuel flow at ground idle. The pressure range of 400-800 PSI ensures that the engine receives an adequate amount of fuel for proper functioning while preventing excessive fuel flow that could lead to engine damage or inefficiency.

The correct answer is 3000 +/- 350. This suggests that the hydraulic accumulator needs to read a pressure of 3000 units with a possible deviation of up to 350 units. This range allows for some flexibility in the reading, accommodating slight variations in the pressure while still ensuring that it remains within an acceptable range for the APU to operate effectively.

The maximum EGT (Exhaust Gas Temperature) at ground and flight idle is 725°C. This temperature is considered to be the upper limit for safe operation of the engine at idle speed. Going beyond this temperature can lead to engine damage or failure. It is crucial to monitor and control the EGT to ensure the engine operates within safe limits and to prevent any potential hazards.

The given answer of "25% N2" suggests that the starter should not be re-engaged above 25% N2. This means that once the starter has reached 25% of its maximum speed, it should not be accelerated further. This could be due to various reasons such as preventing damage to the starter or ensuring a smooth and controlled start of the engine.

When the throttle is advanced to start, the EGT (Exhaust Gas Temperature) indication will be given for a maximum of 10 seconds. This means that within those 10 seconds, the EGT indication will be displayed, providing information about the temperature of the exhaust gases. After this time, the indication may not be available or may not be as accurate.

When two engines are operating at TRT (Takeoff Rated Thrust), they should be shut down when the fuel quantity drops below 60,000. This threshold is likely determined based on the minimum fuel required to safely operate the engines and ensure sufficient power for takeoff. Falling below this fuel quantity could lead to a loss of engine power and potentially compromise the safety of the aircraft.

The low oil pressure warning light goes out at 13 PSI because this is the minimum pressure at which the engine is considered to have sufficient oil pressure. If the pressure drops below this level, it indicates a potential problem with the engine's lubrication system, and the warning light will remain on to alert the driver. Therefore, once the oil pressure reaches or exceeds 13 PSI, the warning light will turn off, indicating that the engine has adequate oil pressure.

The engine operating limit for EGT at ground idle is less than 725°C. This means that the exhaust gas temperature should not exceed 725°C when the engine is idling on the ground. Exceeding this limit could lead to overheating and potential damage to the engine.

The correct answer is 54-62%. This range represents the engine operating limits for N2 RPM at ground idle. It means that the N2 RPM should not fall below 54% or exceed 62% during ground idle. This range ensures that the engine is operating within the specified limits and maintains optimal performance while at idle on the ground.

The EGT (Exhaust Gas Temperature) reading at max continuous operation is 870°C. This indicates the highest temperature that the exhaust gas can reach during continuous operation without causing any damage to the engine.

The correct answer is 13-35 PSI. This range represents the ideal oil pressure for an engine at idle. Oil pressure is important because it ensures proper lubrication of engine components. If the pressure is too low, there may be insufficient lubrication, leading to increased wear and potential damage. On the other hand, if the pressure is too high, it can cause damage to seals and gaskets. Therefore, a range of 13-35 PSI is considered optimal for maintaining engine performance and longevity.

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The correct answer is "less than 160°C". This means that the engine operating limits for oil temperature at ground idle should be below 160°C. This is important to ensure that the engine does not overheat and cause damage. Keeping the oil temperature within this limit helps to maintain proper lubrication and prevent excessive wear and tear on the engine components.