SDR ASAA2017061421072

Service difficulty report · Filter · Boeing 737990ER

Difficulty date: June 14, 2017
Submitted: June 15, 2017
Operation: Air carrier
Aircraft: N491AS
Make and model: Boeing 737990ER
Aircraft serial: 44109
Aircraft time: 6,317 hours, 2,159 cycles
System (JASC): 4990 · APU Oil System
Part: Filter
Part number: 38809381
Condition: Clogged
Location: Apu
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 RED BUTTON EXTENDED ON THE FILTER INDICATOR LUBE HOUSING ON APU DURING A GENERAL VISUAL IAW TASK CARD N8349002. ACFT GROUNDED. COMPLIED WITH T/C N8349002 STEP 3. OIL FILTER INDICATOR SERVICING IAW AMM 49-91-13, MAGNETIC DRAIN PLUG INSPECTED TASK AMM 49-91-81. REMOVED & REPLACED LUBE FILTER ELEMENT IAW AMM 49-91-12 AND REPLACED INDICATOR DIFF PRESSURE ON LUBE FILTER HOUSING. RAN APU FOR LEAK CHECK, NO DEFECTS NOTED.