# SDR FDEA200808293646

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 29, 2008
- Submitted: February 3, 2009
- Operation: Air carrier
- Aircraft: [N661FE](https://openairdocs.org/aircraft/N661FE), registered now
- Make and model: Airbus A300 F4-605R
- Registry model: [Airbus A300 F4-605R](https://openairdocs.org/model/airbus-industrie-a300-f4-605r) (OpenAirDocs)
- Aircraft serial: 760
- Aircraft time: 19,763 hours, 10,484 cycles
- System (JASC): [7320 · Fuel Controlling System](https://openairdocs.org/jasc/7320)
- Part: Hmu
- Part number: 441790
- Part serial: BECK1078
- Condition: Failed
- Location: Nr 1
- Part time: 17,309 hours, 9,173 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: J, G
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/FDEA200808293646

## Discrepancy

NR 1 ENGINE N1 INDICATION BECAME UNSTABLE DURING CLIMB.  REPEAT WRITE-UP.  THEN EGT EXCEEDED LIMITS AT 952 DEG THEN FUEL FLOW INDICATION BECAME UNSTABLE WITH SURGING AND YAW.  PULLED TO IDLE N-1 AND FF INDICATION REMAINED UNSTABLE BUT SURGING STOPPED.  PERFORMED FADEC BITE TEST AND PULLED FAULT CODES NOTHING ABNORMAL FOUND.  BORESCOPED HPT STAGE 1 AND 2 PER 72-00-00-6.  NO DEFECTS NOTED.  REMOVED AND REPLACED HMU REF AMM 73-13-00-4.  PERFORMED PWR RUN PER JRH, ALL PARAMETERS WERE WITHIN LIMITS PER JRH.

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