SDR ASAA2017012119631

Service difficulty report · Insert · Boeing 737890

Difficulty date: January 21, 2017
Submitted: February 2, 2017
Operation: Air carrier
Aircraft: N592AS
Make and model: Boeing 737890
Aircraft serial: 35190
Aircraft time: 34,462 hours, 10,544 cycles
System (JASC): 4990 · APU Oil System
Part: Insert
Condition: Damaged
Location: Lube Mount
Part time: 21,337 hours, 33,823 cycles
Stage of operation: IN
How discovered: V
Nature of condition: O
Precautionary procedure: K

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

What was found

APU OIL MONITORING DATA SHOWS OIL CONSUMPTION TO BE TRENDING HIGHER THAN EXPECTED. ACFT GROUNDED. REMOVED THE APU FUEL CONTROL UNIT AND THE APU LUBE MODULE IAW AMM 49-31-11-000-801 AND 49-91-11-000-802. FOUND APU LUBE MODULE UPPER RT MOUNT INSERT DAMAGED. APU REMOVED IAW T/C 78349010. COMPLETED APU INSTALLATION AND APU TESTED GOOD IAW AMM 49-11-00-400-803 AND 49-11-00-710-801 AND T/C 78349010.