SDR ASAA2019091930777

Service difficulty report · Unknown · Boeing 737990ER

Difficulty date: September 19, 2019
Submitted: September 23, 2019
Operation: Air carrier
Aircraft: N402AS
Make and model: Boeing 737990ER
Aircraft serial: 41189
Aircraft time: 27,256 hours, 8,880 cycles
System (JASC): 4940 · APU Start/Ignition System
Part: Unknown
Condition: Malfunctioned
Location: Apu
Stage of operation: NR
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

PILOT SELECTED START ON APU SWITCH, AND RELEASED TO RUN. AFTER APPROXIMATELY 2-3 MINUTES, PILOT OBSERVED APU EGT GUAGE READING BETWEEN 200-300 DEGREES, THE LOW OIL PRESSURE LIGHT ILLUMINATED, AND THE APU GEN OFF BUS LIGHT WAS NOT ILLUMINATED. PILOT SELECTED OFF ON APU SWITCH. GROUNDED - YES. ACCOMPLISHED FIM 49-15 TASK 805 AND FIM 49-60 TASK 801 NO FAULTS SHOWN IN CURRENT, MAINT, OR FAULT HISTORY. APU STARTED NORMALLY.