Service difficulty report · Air Filter · Boeing 737823

Difficulty date
April 28, 2026
Submitted
April 29, 2026
Operation
Air carrier
Aircraft
N969AN
Make and model
Boeing 737823
Aircraft serial
29546
Aircraft time
69,416 hours, 29,390 cycles
Part
Air Filter
Condition
Contaminated
Location
Zone 100
Stage of operation
CL
How discovered
O
Nature of condition
B
Precautionary procedure
O

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

What was found

AIRCRAFT WAS GROUNDED: REPEAT WRITE UP: MUSTY ODOR DURING CLIMB THROUGH FL290. ACCOMPLISHED J/C 08L00021001, PREVIOUS SHIFT FOUND OIL STILL LEAKING FROM APU INTO BLEED VALVE, WHICH IS CAUSING INGESTION INTOPACKS WHEN APU IS ON. CHANGED RECIRCULATION FILTERS. PER AMM 21-25-01.