SDR ASAA2018122827605

Service difficulty report · Filter · Boeing 737990ER

Difficulty date: December 22, 2018
Submitted: December 29, 2018
Operation: Air carrier
Aircraft: N492AS
Make and model: Boeing 737990ER
Aircraft serial: 44110
Aircraft time: 12,323 hours, 4,157 cycles
System (JASC): 4990 · APU Oil System
Part: Filter
Part number: 38809381
Condition: Clogged
Location: Apu Oil System
Stage of operation: IN
How discovered: V
Nature of condition: J
Precautionary procedure: K

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

What was found

FOUND BYPASS INDICATOR POPPED ON APU OIL FILTER. GROUNDED - YES. PERFORMED OIL FILTER SERVICING REF B737-900 AMM 49-91-13, PERFORMED MAGNETIC PLUG INSPECTION REF AMM 49-91-81, AND REMOVED AND REPLACED APU OIL FILTER REF AMM 49-91-13, NO FURTHER DEFECTS NOTED, A/C OK FOR SERVICE, RUN APU WITH NO ISSUES.