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Aero Precision provides OEM part support for military aircraft operators across more than 20 aircraft

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APU came from overhaul, ran through test cell - all good. Installed on aircraft, bleed air

on, but no load, there is a 5 - 10psi pressure surge, small EGT and RPM flux. When a load is

applied (eg aircon pack), it stabilizes. Removed and sent to test cell, again nothing could be

found. Installed on another aircraft, has the same problem. Replaced the load control valve,

but still the same.

Anyone have any ideas ...??

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