• Mark replied to the topic APU Faults in ATA 49 APU
    I'm somewhat confused.
    You pulled a working APU FADEC (or ECU - Electronic Control Unit) from the aircraft in question and installed it on another aircraft. Now you have issues.
    Did you try putting the original ECU back in?

    RPM is a fuel control issue. You stated you changed it. RPM's are fluctuating.

    I'm I to assume it has a DC generator installed? If it's an AC generator, you can verify RPM's by watching the 400Hz output. If it's climbing and diving along with APU speed..... you still have a fuel control issue.

    You swapped the harness, so rules out wiring.

    Any other faults showing up on the FADEC?
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