SDR ASAA2013052094857

Service difficulty report · Warning Light · Boeing 737990ER

Difficulty date: May 20, 2013
Submitted: May 23, 2013
Operation: Air carrier
Aircraft: N413AS
Make and model: Boeing 737990ER
Aircraft serial: 35205
Aircraft time: 538 hours, 173 cycles
System (JASC): 4900 · Airborne Auxiliary Power Unit (APU) System
Part: Warning Light
Condition: False Activation
Location: Apu
Stage of operation: TX
How discovered: O
Nature of condition: N
Precautionary procedure: O

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

What was found

ON APU START, MAINTENANCE LIGHT ILLUMINATED. ACFT GROUNDED. PERFORMED APU BITE TEST REF 49-60 TASK 801, FOUND FAULT CODE 49-91227 LOGGED. VERIFIED OIL LEVEL IAW MM 12-13-31, NO FAULTS FOUND. ACCOMPLISHED FIM TASK 49-90 TASK 804 NO FAULTS NOTED, GROUND VERIFICATION CHECKS NORMAL.