A pilot reports that when the hydraulic pump is running, the pressure is normal. However, when the pump is stopped, no hydraulic pressure is available. This is a indication of a

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A pilot reports that when the hydraulic pump is running, the pressure is normal. However, when the pump is stopped, no hydraulic pressure is available. This is an indication of a leaking accumulator air valve

This is further explained below.

What is an accumulator air valve?

Generally, An accumulator of the bladder type is a metal tank that houses a rubber bladder that is filled with compressed gas. This form of the accumulator is also sometimes referred to as a hydro-pneumatic accumulator. In addition, the discharge port has a poppet valve, and the gas valve that is used to precharge the bladder has its own separate valve.

In conclusion, When the hydraulic pump is operating normally, according to the report of a pilot, the pressure is normal. On the other hand, there is no hydraulic pressure available when the pump is turned off. The presence of this symptom is evidence of a leaky accumulator air valve.

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Universidad de Mexico