# SDR AALA202104229001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 21, 2021
- Submitted: April 22, 2021
- Operation: Air carrier
- Aircraft: [N801NN](https://openairdocs.org/aircraft/N801NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29565
- Aircraft time: 35,193 hours, 14,221 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Air Filter
- Condition: Dirty
- Location: Zone 100 - Fuse
- Stage of operation: TO
- How discovered: O
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202104229001

## Discrepancy

AIRCRAFT WAS GROUNDED: MODERATE DIRTY SOCK / OIL SMELL FROM TAKEOFF WELL INTO CRUISE. ONLY SLIGHT SMELL INCREASE DURING LANDING IN FLIGHT DECK AND CABIN. SMELL INCREASED DURING DESCENT. ACCOMPLISHED WORK CARD 05-96-70 "08L00021001" SMOKE ODOR FUMES. TROUBLESHOT AND CONTAMINATION REMOVAL FROM AIR CONDITION AND PNEUMATIC IAW AMM 21-00-01 AS PRECAUTION. REMOVED & REPLACED RECIRCULATION AIR FILTER IAW AMM 21-25-01

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