SDR ASAA2015051011679

Service difficulty report · Apu · Boeing 737890

Difficulty date: May 10, 2015
Submitted: May 12, 2015
Operation: Air carrier
Aircraft: N531AS
Make and model: Boeing 737890
Aircraft serial: 35199
Aircraft time: 19,718 hours, 5,960 cycles
System (JASC): 4900 · Airborne Auxiliary Power Unit (APU) System
Part: Apu
Condition: Malfunctioned
Stage of operation: TX
How discovered: 9
Nature of condition: O
Precautionary procedure: O

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

What was found

APU STARTS, APU AIR WORKS, BUT IT WILL NOT POWER THE GENERATORS. APU SHOWS 0 VOLTS. ACFT GROUNDED. OPERATED APU 5 TIMES, EACH TIME VOLTS AND FREQUENCIES NORMAL. PERFORMED APU GCU BITE NO FAULTS IAW FIM 24-21 TASK 801. CDU APU MAINT PAGE SHOWS NO CURRENT FAULTS, NO RELATED FAULT HISTORY, AND NO RELATED MAINTENANCE HISTORY.