SDR AALA202603270375

Service difficulty report · Air Filter · Boeing 737823

Difficulty date: March 25, 2026
Submitted: March 27, 2026
Operation: Air carrier
Aircraft: N936AN
Make and model: Boeing 737823
Aircraft serial: 29532
Aircraft time: 69,820 hours, 29,578 cycles
System (JASC): 2120 · Air Distribution System
Part: Air Filter
Condition: Dirty
Location: Zone 100
Stage of operation: DE
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: AT FL270 FLIGHT ATTENDANT REPORTED A MODERATE DIRTY SOCK SMELL FROM THE CENTER TO AFT FUSELAGE. ACCOMPLISHED JC 08L00021001 AND NO SMOKE OR ODOR WAS PRESENTED. SOF EVENT COULD NOT DUPLICATED AT THIS TIME. PERFORMED BOTH PACK DECONTAMINATION/ PNEUMATIC DUCT PURGING, PER AMM21-00-01. REMOVED AND REPLACED BOTH RECIRCULATION FAN FILTERS (AALA202603260375) AND (AALA202603279672), PER AMM21-25-01 (OPEN).