Forum: F-16 Procedures

simonlwa wrote:

Hi all, pardon me that I have to ask a few questions on the falcon's hyd systems. I just need an answers to my questions so as to improve my sys knowledge.

1) Why is the pressure for flight control accumulator dump automatically upon shut down?

2) Why retain the hyd sys reservoir pressure when the above-mentioned is dump? is it just a pure case whereby its for the ground crews to monitor pressure?

Can the pros guide me on this cause I really could not find the ans after going through our technical manuals. Or if anyone can provide me with info like where can I find the real ans, it will be great.

The flight control accumulators are in the system to provide flight control power after gearbox or drive shaft failure. They are needed to bridge the time gap for the EPU to start up. Placing a check valve to prevent them from discharging will prevent them from performing this important task.

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simonlwa wrote:

Hi all, pardon me that I have to ask a few questions on the falcon's hyd systems. I just need an answers to my questions so as to improve my sys knowledge.

1) Why is the pressure for flight control accumulator dump automatically upon shut down?

2) Why retain the hyd sys reservoir pressure when the above-mentioned is dump? is it just a pure case whereby its for the ground crews to monitor pressure?

Can the pros guide me on this cause I really could not find the ans after going through our technical manuals. Or if anyone can provide me with info like where can I find the real ans, it will be great.

The reservoirs are pressured to keep pump suction pressures high enough to prevent cavitation. Cavitation is only a problem at high flow rates or very lot temperature conditions. Otherwise, it's no big deal. So, DON'T dump reservoir pressure when you are in cold climates.

Forum: F-16 Procedures

Why retain hyd reservoir pressure?