SDR CALA2026040215035

Service difficulty report · Filter · Boeing 757224

Difficulty date: April 1, 2026
Submitted: April 2, 2026
Operation: Air carrier
Aircraft: N12116
Make and model: Boeing 757224
Aircraft serial: 27558
Aircraft time: 111,332 hours, 23,326 cycles
System (JASC): 2120 · Air Distribution System
Part: Filter
Condition: Odor
Location: Zone 100
Stage of operation: IN
How discovered: V
Nature of condition: B
Precautionary procedure: K

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

What was found

ACRID ODOR COMING FROM L PACK WHEN OPERATING. PLACED LEFT PACK SYSTEM INOP COMPLIED WITH MEL REQUESTS TOMC APPROVAL INSPECTED NO ODOR ON RIGHT PACK . ISOLATED. LEFT PACK NEEDS TO REPLACED RECCESS FILTER INSPECTED BOTH PACK BAYS. NO DISCREPANCIES NOTED. REPLACED BOTH LT & RT RECIRC FILTERS AS PRECAUTION IAW AMM 21-25-02. NO OIL CONTAMINATION NOTED, YET BOTH FILTERS VERY DIRTY. RAN PACKS, VERIFIED BOTH COOL INDEPENDENTLY. NO ODOR NOTED. MEL REMOVED.