# SDR USAA20110405SB049

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 3, 2011
- Submitted: April 5, 2011
- Operation: Air carrier
- Aircraft: [N419US](https://openairdocs.org/aircraft/N419US), registered now
- Make and model: Boeing 737401
- Aircraft serial: 23986
- Engine: Cfmint CFM563B2
- System (JASC): [7261 · Turbine Engine Oil System](https://openairdocs.org/jasc/7261)
- Part: Seal
- Part number: 9325M85G04
- Part serial: 724604
- Condition: Leaking
- Location: Nr 1 Engine
- Part time: 51,947 hours, 35,500 cycles
- Stage of operation: TO
- How discovered: O
- Nature of condition: B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAA20110405SB049

## Discrepancy

CLT - DURING MAINTENANCE TEST FLIGHT FOR Q5 CHECK, STRONG FUMES FORWARD OF FIRST CLASS WERE REPORTED AS TAKEOFF THRUST WAS SET.  FUMES WERE THAT OF A MUSTY SMELL.  TURNED LEFT PACK OFF AND RETURNED TO CLT.  FUMES CONTINUED UNTIL TOUCHDOWN.  OPENED WINDOWS ONCE ON GROUND.  MAINTENANCE BOROSCOPED THE NR 1 ENGINE AND FOUND AN INTERNAL OIL LEAK AT THE NR 3 AIR/OIL SEAL.  REMOVED AND REPLACED NR 1 ENGINE ASSEMBLY.

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