SDR ASAA2015052111834

Service difficulty report · Warning Light · Boeing 737990ER

Difficulty date: May 21, 2015
Submitted: May 26, 2015
Operation: Air carrier
Aircraft: N413AS
Make and model: Boeing 737990ER
Aircraft serial: 35205
Aircraft time: 8,588 hours, 2,755 cycles
System (JASC): 4940 · APU Start/Ignition System
Part: Warning Light
Condition: Illuminated
Location: Apu
Stage of operation: TX
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 FAULT LIGHT ON START ATTEMPT APU WOULD NOT START. ACFT GROUNDED. UNABLE TO CONFIRM FAULT, STARTED APU NUMEROUS TIMES, APU CURRENT FAULT PAGE & FAULT HISTORY PAGE SHOW NO FAULTS. ACCOMPLISHED APU GROUND FUNCTIONAL CHECK REF FIM 49-40, TASK 803, CDU DISPLAY DOES NOT SHOW THIS MESSAGE IN THE APU FAULT HISTORY PAGE, OPS CHECK NORMAL. BATTERY VOLTAGE PRI 31VDC, AUX 28 VDC. INSPECTED THE APU MAGNETIC DRAIN PLUG REF AMM TASK 49-91-81-200-801, NO FAULTS NOTED. NO HISTORY LAST 90 DAYS.