NCAA Flight Engineer Licence Practice Questions - NCAA Flight Engineer Licence Examination (Nigeria) Exam

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Why are hydraulic fluid reservoirs in high-altitude transport aircraft pressurized with engine bleed air or regulated nitrogen?

To prevent hydraulic pump cavitation at high altitudes and maintain positive fluid head pressure To increase fluid viscosity during cold-weather operations To cool the hydraulic fluid before it enters the return lines To drive the hydraulic actuators directly without pump pressure

Correct Answer:

To prevent hydraulic pump cavitation at high altitudes and maintain positive fluid head pressure

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