# SDR COEA2016072552801

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 25, 2016
- Submitted: July 26, 2016
- Operation: Air carrier
- Aircraft: [N801FX](https://openairdocs.org/aircraft/N801FX), registered now
- Make and model: Aerosp ATR 72-212
- Registry model: [Aerosp ATR 72-212](https://openairdocs.org/model/aerospatiale-atr-72-212) (OpenAirDocs)
- Aircraft serial: 338
- Aircraft time: 35,289 hours, 39,303 cycles
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Adc
- Part number: 7000700951
- Part serial: 91034684
- Condition: Failed
- Location: Nr 1
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/COEA2016072552801

## Discrepancy

PASSING THROUGH APPROX. 7000FT, THE NR 1 ENGINE SURGED THROUGH APPROX. 95%. CREW ELECTED TO RETURN TO ANC, NO EMERGENCY DECLARED. LANDED WITHOUT INCIDENT. CORRECTIVE ACTION: COULD NOT DUPLICATE DURING ENGINE RUNS. OCF PERFORMED TO MONITOR ALL ENGINE PARAMETERS. NR 1 & 2 ENGINES SURGED IN VARIOUS PHASES OF FLIGHT. REPLACED NR 1 ADC. OPS CHECKED GOOD. SECOND OCF PERFORMED. OCF SUCCESSFUL, NO TORQUE SURGE. AIRCRAFT RETURNED TO SERVICE.

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