# SDR 2005UALA01301

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 20, 2005
- Submitted: November 29, 2005
- Operation: Air carrier
- Aircraft: N407UA
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 456
- Aircraft time: 39,804 hours, 14,374 cycles
- Engine: Iae V2527A5
- Engine time: 23,465 hours, 8,224 cycles
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Engine
- Condition: Surges
- Location: Nr 1
- Stage of operation: CL
- How discovered: O
- Nature of condition: R, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2005UALA01301

## Discrepancy

RETURNED TO FIELD AFTER THE NR 1 ENGINE SURGED.   ECM SHOWS NO RECORD OF A SURGE/STALL. EEC/FADEC RECORDED NO STALL MESSAGE.  FMU WAS REPLACED FOR N1 OVER SPEED AND CHANNEL B FAULT. FMU TEST SHOWS NO FAULT FOUND.  CAUSE OF SURGE CAN NOT BE DETERMINED.

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