# SDR SA07028

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 18, 2007
- Submitted: April 20, 2007
- Operation: Air carrier
- Aircraft: [N179UW](https://openairdocs.org/aircraft/N179UW), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 1521
- Engine: Ge CFM56*
- System (JASC): [7321 · Fuel Control/Turbine Engines](https://openairdocs.org/jasc/7321)
- Part: Hmu
- Part number: 8061532
- Condition: Leaking
- Location: Zone 400
- Part time: 18,256 hours
- Stage of operation: DE
- How discovered: O
- Nature of condition: E, K
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SA07028

## Discrepancy

DTW FLT 902 EN ROUTE CLT TO DTW, DURING DESCENT, BELOW FL 290, ENGINE 1 BEGAN TO RUMBLE AND VIBRATE.  THE AUTOTHROTTLE WAS DISCONNECTED AND THE NUMBER 1 ENGINE WAS BROUGHT BACK IDLE AND THE VIBRATIONS STOPPED.  AT 7,000 FEET AND 210 KNOTS, THE AUTOTHROTTLES WERE RE-ENGAGED AND ALL OPERATIONS WERE NORMAL.  AFTER LANDING AND ARRIVAL AT THE GATE, THE GROUND CREW NOTICED A TRAIL OF FUEL THAT FOLLOWED THE NUMBER ENGINE, ENDING IN A PUDDLE UNDERNEATH IT.  ALSO, A 1,000 POUND DIFFERENCE IN FUEL BURN BETWEEN THE LEFT AND RIGHT FUEL TANKS WAS NOTED.  MAINTENANCE FOUND THE NUMBER 1 ENGINE HMU LEAKING.  THE HMU WAS CHANGED WITH THE ENGINE.  THE ENGINE WAS CHANGED DUE TO OTHER PERFORMANCE ISSUES NOT RELATED TO THE FUEL LEA

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