SDR ASAA1158761

Service difficulty report · Unknown · Boeing 737890

Difficulty date: January 11, 2011
Submitted: January 14, 2011
Operation: Air carrier
Aircraft: N596AS
Make and model: Boeing 737890
Aircraft serial: 35688
Aircraft time: 10,340 hours, 3,334 cycles
System (JASC): 4950 · APU Bleed Air System
Part: Unknown
Condition: Malfunctioned
Stage of operation: TX
How discovered: O
Nature of condition: O
Precautionary procedure: D

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

What was found

STARTING 1 ENGINE APU GENERATOR DROPPED OFFLINE WHEN N1 RPM AT 50 PERCENT. TRIED TO START NR 2 ENGINE COULD ONLY GET 10 PERCENT N2 DUCT PRESSURE LOW. PERFORMED APU BITE CHECK FOUND FAULT CODE 49 52289. ACCOMPLISHED FIM TASK 49 54 00 810 808 STEPS F (1). CLEARED ALL APU FAULTS. PERFORMED SEVERAL ENG STARTS REF MM 71 00 00. ALL STARTS NORMAL. GROUND VERIFICATION SUCCESSFUL. PERFORMED APU BITE CHECK NO FAULTS LOGGED.