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Our GTC85-180L APU starts and runs well. However,  it doesn't supply bleed air. We have isolated the load control valve. We equally isolated the APU control switch as well as pressure regulator. We cleaned in-line filter. Despite these steps,  APU still doesn't supply bleed air. It is strange to us and I am wandering if anyone has had this type of experience before and the possible solution. Thanks. 

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2 hours ago, pjvr99 said:

"not supply air" - do you mean load control valve is not opening, or load control valve is not holding load?


We believe the load control valve is not opening. We confirmed that the load control valve is not the issue because we tested it on another APU and it worked. 

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