# SDR DALA13064680975

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 27, 2013
- Submitted: December 2, 2013
- Operation: Air carrier
- Aircraft: N975DL
- Make and model: Doug MD-88
- Registry model: [Doug MD-88](https://openairdocs.org/model/mcdonnell-douglas-md-88) (OpenAirDocs)
- Aircraft serial: 53243
- Aircraft time: 60,300 hours, 44,721 cycles
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Adc
- Condition: Failed
- Stage of operation: CR
- How discovered: O
- Nature of condition: F
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA13064680975

## Discrepancy

DURING CRUISE,  DECLARED AN EMERGENCY, AFTER LOSING BOTH NR 1 & 2 AIR DATA SYSTEMS.  INITIALLY RECEIVED MACH TRIM INOPERATIVE LIGHT FOLLOWED BY DUAL AUTOTHROTTLE AND AUTOPILOT DISENGAGEMENT. CAPTAIN`S  & F/O`S AIRSPEED INDICATIONS SUBSEQUENTLY BECAME UNRELIABLE.  LANDED SAFELY USING STANDBY INSTRUMENTS ONLY.  MX REPLACED BOTH AIR DATA COMPUTERS IAW AMM 34-16-01 AND ALSO REPLACED THE RAT PROBE IAW AMM 34-1 WITH ALL SUBSEQUENT CHECKS OK.    A VERIFICATION FLIGHT WAS PERFORMED AFTER MAINTENANCE.  THE ACFT WAS RETURNED TO SERVICE.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.