SDR UIEA2020071311518

Service difficulty report · Ecu · Boeing 76731K

Difficulty date: July 7, 2020
Submitted: July 13, 2020
Operation: Air carrier
Aircraft: N1373A
Make and model: Boeing 76731K
Aircraft serial: 27205
Aircraft time: 102,025 hours, 21,484 cycles
System (JASC): 4940 · APU Start/Ignition System
Part: Ecu
Part number: 211734220
Part serial: 36A0209
Condition: Failed
Location: Apu
Stage of operation: LD
How discovered: 9
Nature of condition: O
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

APU FAILED TO START TWICE, AFTER LANDING. EGT REACHED 780 DEGREES AND RPM HUNG AT 30%, APU FAULT EICAS MESSAGE. FOUND BATTERY AT 37 AMPS, REMOVED AND REPLACED THE BATTERY IAW AMM 24-31-05. REMOVED AND REPLACED THE APU ECU IAW AMM 49-61-05. OPS CHECKED NORMAL.

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