# SDR AALA20161229007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 26, 2016
- Submitted: December 29, 2016
- Operation: Air carrier
- Aircraft: [N825NN](https://openairdocs.org/aircraft/N825NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31087
- Aircraft time: 22,311 hours, 8,610 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Filter
- Part number: P199753
- Condition: Dirty
- Location: Recirculation
- Stage of operation: CL
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA20161229007

## Discrepancy

AFTER TAKEOFF AND DURING CRUISE, A STRONG ODOR OF HEATER BURN WAS NOTED IN THE COCKPIT AND AROUND ROWS 6 AND 7.  AIRCRAFT WAS GROUNDED.  REMOVED AND REPLACED BOTH RECIRCULATION AIR FILTERS IAW AMM 21-25-01.  OPERATIONAL CHECK GOOD.

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