FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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Prepare for the FAA AMT Airframe Exam with our comprehensive quiz. Featuring flashcards and multiple choice questions, each with hints and explanations to enhance your learning experience. Get ready to pass your exam with confidence!

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If the hydraulic system pressure is normal with the engine-driven pump running, but disappears after shutting off the engine, what does this indicate?

A blocked hydraulic line
A leaking hydraulic pump
No air pressure in the accumulator
A ruptured hydraulic line

The correct answer is: No air pressure in the accumulator

When the hydraulic system pressure is normal with the engine-driven pump running but disappears after shutting off the engine, and if there is no air pressure in the accumulator, it indicates that the accumulator is not maintaining pressure in the system once the engine is shut off. The accumulator acts as a backup source of hydraulic pressure when the engine-driven pump is not operational, such as during engine shutdown. If there is no air pressure in the accumulator, the system will lose pressure once the engine stops running, leading to the observed drop in hydraulic pressure. This situation is known as a loss of accumulator pressure and can be a serious issue, as it could result in the loss of critical hydraulic functions when needed. Options A, B, and D are incorrect because they suggest issues related to the hydraulic lines or pump itself, which do not align with the given scenario where the pressure is normal with the engine running. The correct interpretation is that the accumulator is not holding pressure, leading to a loss of hydraulic pressure after engine shutdown.