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Aux system pressure loss and high temp


Leakybirds
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Hey guys, I have a question I’m hoping someone knows an answer to. I have a plane that’s pressure drops when ground test valve is tied and elevator is on its stop. Sits at about 2600 and the longer it sits it drops to 2200. We figured it was the elevator compensator letting fluid through. We changed it. Same issue only now we noticed the temp when running our aux pump is getting very hot. We will change the aux pump. I guess my question is why would the pump be doing this only in those conditions?

 

thanks for any help! 

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