# SDR MTNA20220615001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 15, 2022
- Submitted: June 16, 2022
- Operation: Air carrier
- Aircraft: [N804FX](https://openairdocs.org/aircraft/N804FX), registered now
- Make and model: Aerosp ATR72
- Aircraft serial: 370
- Aircraft time: 40,391 hours, 40,796 cycles
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: None
- Condition: None
- Stage of operation: TO
- How discovered: V
- Nature of condition: O
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/MTNA20220615001

## Discrepancy

DURING THE TAKEOFF ROLL, AT 70KTS, THE CREW RECEIVED AN ADU MESSAGE OF "DADC DATA INVALID," ACCOMPANIED BY A ZERO AIRSPEED INDICATION ON THE CAPTAIN'S SIDE AIRSPEED INDICATOR. THE CREW ABORTED THE TAKEOFF, NOTIFIED ATC, AND RETURNED TO THE GATE. MAINTENANCE REPLACED THE #1 AIR DATA COMPUTER WITH A SUCCESSFUL OPS CHECK.

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