# SDR 9517889938

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 12, 1995
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N1798U
- Make and model: Doug DC-9-31
- Registry model: [Doug DC-9-31](https://openairdocs.org/model/douglas-dc-9-31) (OpenAirDocs)
- Aircraft serial: 47369
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Adc
- Condition: Failed
- Location: E/E Compt
- Stage of operation: CL
- Nature of condition: J, G
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9517889938

## Discrepancy

DURING CLIMB, THE ALTIMETER AND BOTH THE NR 1 AND NR 2 ATC TRANSPONDERS FAILED AND THE AUTOPILOT WOULD NOT ENGAGE.  THE AIRCRAFT RETURNED TO DTW AND LANDED WITHOUT INCIDENT.  REPLACED THE AIR DATA COMPUTER AND THE NR 2 ATC TRANSPONDER, OPERATIONAL CHECK GOOD.

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