SDR ASAA2015041911416

Service difficulty report · Apu · Boeing 737990ER

Difficulty date: April 19, 2015
Submitted: April 23, 2015
Operation: Air carrier
Aircraft: N435AS
Make and model: Boeing 737990ER
Aircraft serial: 43292
Aircraft time: 5,725 hours, 1,897 cycles
System (JASC): 4900 · Airborne Auxiliary Power Unit (APU) System
Part: Apu
Condition: Malfunctioned
Stage of operation: CR
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

APU FAILED TO START AT FL 36 & FL 320 WITH FAULT LIGHT. FAULT LIGHT ILLUMINATED DURING APU START ATTEMPT FL360, FAULT LIGHT REMAINED ON FOR 4 MINUTES 40 SEC, FAULT LIGHT ILLUMINATED DURING SECOND ATTEMPT AT FL320, FAULT LIGHT REMAINED ILLUMINATED FOR 6 MINUTES 15 SECS, NO THIRD ATTEMPT MADE IAW APU FAULT LIGHT QRH. ACFT GROUNDED.