# SDR COEA0602817

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 7, 2006
- Submitted: January 5, 2007
- Operation: Air carrier
- Aircraft: N817FX
- Make and model: Aerosp ATR 72 202
- Registry model: [Aerosp ATR 72 202](https://openairdocs.org/model/aerospatiale-atr-atr-72-202) (OpenAirDocs)
- Aircraft serial: 256
- Engine: Pwa PW124B
- Propeller: Hamstd 14SF*
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Adc
- Part number: 7000700951
- Condition: Failed
- Location: Left
- Part time: 417 hours
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/COEA0602817

## Discrepancy

AIR TURN-BACK, ON TAKEOFF, THE CAPT`S AIRSPEED, ALTIMETER, VSI, AND TORQUE BUG FAILED.  THE CREW ELECTED TO RETURN TO DEPARTURE.  THE CAUSE WAS FOUND TO BE THE NR 1 ADC.  THE PART WAS REPLACED AND ALL OPERATIONAL CHECKS PERFORMED SATISFACTORY.  (K)

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