# SDR AALA200803120

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 15, 2008
- Submitted: March 18, 2009
- Operation: Air carrier
- Aircraft: [N798AN](https://openairdocs.org/aircraft/N798AN), registered now
- Make and model: Boeing 777223
- Aircraft serial: 30797
- Aircraft time: 31,705 hours
- Engine: Rroyce RB211TRENT89
- Engine time: 10,811 hours
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Gearbox
- Condition: Leaking
- Location: Nr 1 Engine
- Stage of operation: CL
- How discovered: O
- Nature of condition: K, B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA200803120

## Discrepancy

LHR  INFLIGHT.  NOXIOUS ODOR COMING FROM AIR CONDITIONING PACKS DURING DESCENT AND CLIMB-OUT.  CREW USED OXYGEN MASKS DUE TO EYE IRRITATION.  LANDED LHR WITHOUT INCIDENT.  FOUND EVIDENCE OF OIL LEAK ON NR 1 ENGINE CORE AROUND TRANSFER GEARBOX.  REPLACED NUMBER ONE ENGINE ON 20 DEC AT DFW.  SYSTEM GROUND CHECKED NORMAL OPERATION.

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