FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

Question: 1 / 1030

If an engine driven hydraulic pump fails to maintain pressure for a cowl flap actuating unit, what is a probable cause?

A failed pressure relief valve

Leakage in the system

Restriction in the pump outlet

A probable cause for an engine driven hydraulic pump failing to maintain pressure for a cowl flap actuating unit could be a restriction in the pump outlet. This could be due to a buildup of debris or a clogged filter that is inhibiting the proper flow of hydraulic fluid.

Option A, a failed pressure relief valve, would result in too much pressure rather than a lack of pressure. Option B, leakage in the system, may contribute to a decrease in pressure, but it would not be the primary cause. Option D, air in the hydraulic fluid, could cause decreased pressure but would also likely result in other performance issues in the system. Therefore, option C is the most likely cause in this scenario.

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Air in the hydraulic fluid

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