# SDR AALA20110604MIA01

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 4, 2011
- Submitted: June 7, 2011
- Operation: Air carrier
- Aircraft: [N647AM](https://openairdocs.org/aircraft/N647AM), registered now
- Make and model: Boeing 757223
- Aircraft serial: 24605
- Aircraft time: 62,001 hours, 21,248 cycles
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Adc
- Condition: Malfunctioned
- Location: Left
- Stage of operation: CR
- How discovered: O
- Nature of condition: G
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA20110604MIA01

## Discrepancy

MIA - CREW REPORTED DURING CRUISE MACH WINDOW AIR SPEEED KEPT INCRESING. TURNED OFF AUTO THROTTLE AND REDUCED THRUST BUT AIRSPEED WOULD NOT REDUCE.  ABOUT 1 MINUTE LATER AIRSPEED BEGAN TO SLOW.  FLIGHT RETURNED MIA LANDED WITHOUT INCIDENT.  AIRCRAFT REMOVED FROM SERVICE.  REPLACED LEFT AIR DATA COMPUTER.  SYSTEM GROUND CHECK NORMAL OPERATION.

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