SDR ASAA2020081753027

Service difficulty report · Lubrication Unit · Boeing 737990ER

Difficulty date: August 15, 2020
Submitted: August 18, 2020
Operation: Air carrier
Aircraft: N469AS
Make and model: Boeing 737990ER
Aircraft serial: 41702
Aircraft time: 23,204 hours, 7,485 cycles
System (JASC): 4990 · APU Oil System
Part: Lubrication Unit
Part number: 41310203
Part serial: 7638
Condition: Failed
Location: Apu
Part time: 6,985 hours, 13,089 cycles
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 FL370; 1ST ATTEMPT EGT ROSE TO 600 FAULT LIGHT ILLUMINATED APU SHUT DOWN ON ITS OWN, 2ND ATTEMPT 10 MINUTES LATER NO EGT, FAULT LIGHT, NO START. GROUNDED - YES. REPLACED APU LUBE MODULE AND FUEL CONTROL UNIT, REF B737-900 AMM 49-91-11-000-803, 49-91-11-400-803, 49-31-11-000-801 AND 49-31-11-400-801. OP'S AND LEAK CHECK GOOD.