SDR ASAA2015032311090

Service difficulty report · Apu · Boeing 737990ER

Difficulty date: March 23, 2015
Submitted: March 25, 2015
Operation: Air carrier
Aircraft: N461AS
Make and model: Boeing 737990ER
Aircraft serial: 36363
Aircraft time: 3,840 hours, 1,271 cycles
System (JASC): 4900 · Airborne Auxiliary Power Unit (APU) System
Part: Apu
Condition: Malfunctioned
Stage of operation: TX
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

ON TAXI IN APU START HAS NO START WITH FAULT LIGHT. FAULT LIGHT EXTINGUISHED AT GATE FOLLOWING POWER TRANSFER TO GROUND POWER. SECOND START ATTEMPT, OPS NORMAL START, FOLLOWING 5 MIN OFF IAW QRH. ACFT GROUNDED. PERFORMED THE APU FIM TASK 49-40, 803 FAULT ISOL PROCEDURE. APU SHOWS FAULT 49-41012, CLEARED IN LATEST APU OPS. START, FAULT CORRECTED.