SDR ASAA2013052894922

Service difficulty report · Warning Message · Boeing 737990ER

Difficulty date: May 28, 2013
Submitted: May 30, 2013
Operation: Air carrier
Aircraft: N423AS
Make and model: Boeing 737990ER
Aircraft serial: 35206
Aircraft time: 151 hours, 35 cycles
System (JASC): 4900 · Airborne Auxiliary Power Unit (APU) System
Part: Warning Message
Condition: False Indication
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

APU MAINT LIGHT ILLUMINATED ON APU START. ACFT GROUNDED. PERFORMED APU BITE PROCEDURE. REF FIM 49-60 TASK 801. FOUND MX MESSAGE 49-91227. PERFORMED FIM 49-90, TASK 804, FAULT ISOLATION, STEP E. NO MX MESSAGE ON CURRENT STATUS PAGE. DETERMINED TO BE AN INTERMITTENT FAULT.