# SDR 99UAL900654

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 14, 1999
- Submitted: October 9, 2000
- Operation: Air carrier
- Aircraft: N7444U
- Make and model: Boeing 727222
- Aircraft serial: 21898
- Aircraft time: 58,364 hours, 33,826 cycles
- Engine: Pwa JT8D15
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Unknown
- Condition: Smoke
- Location: Cabin
- Stage of operation: TX
- How discovered: O
- Nature of condition: B, J
- Precautionary procedure: G
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99UAL900654

## Discrepancy

ON LANDING WHILE ENGINES WERE IN REVERSE SMOKE APPEARED IN CABIN.  ENGINE BLEEDS AND PACKS WERE SHUT OFF PROBLEM WENT AWAY.  *S/D*  UNKNOWN CAUSE.  SEATTLE MAINTENANCE TRIED TO DUPLICATE PROBLEM BY RUNNING ALL ENGINES AND PACKS, AND CYCLEING REVERSERS.  PROBLEM COULD NOT BE DUPLICATED.

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