# SDR AALA202205101709

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 8, 2022
- Submitted: May 10, 2022
- Operation: Air carrier
- Aircraft: [N970UY](https://openairdocs.org/aircraft/N970UY), registered now
- Make and model: Airbus A300*
- Aircraft serial: 3924
- Aircraft time: 43,914 hours, 16,005 cycles
- System (JASC): [2200 · Auto Flight System](https://openairdocs.org/jasc/2200)
- Part: Adiru
- Part number: 46502003030316
- Part serial: 0017160
- Condition: None
- Location: Zone 100 - Fuse
- Part time: 43,969 hours, 16,067 cycles
- Stage of operation: CR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202205101709

## Discrepancy

AIRCRAFT WAS GROUNDED: ON TAXI DURING 90 DEGREE  TURN ENCOUNTERED ADR 1 FAULT WHICH SELF CLEARED.  ON CLIMB (FL200) AND AT CRUISE (FL330) ENCOUNTERED UN-COMMANDED YAW MOVEMENT WITH ACCOMPANYING ADR1 FAULT MOMENTARILY (1/2 SECOND) BEFORE CLEARING ITSELF.  AP2 WAS ENGAGED.   SWITCHING TO AP1 WAS A YAW UPON THE 4TH ADR1 FAULT. ON DECENT IN LIGHT TURBULENCE ADRS "ON BAT", IR1"FAULT" , ADR "FAULT" ILLUMINATED INTERMITTENTLY ABOUT 4 OR 5 TIMES.. REPLACED #1 AIR DATA AND INERTIAL REFERENCE UNIT (ADIRU) PER AMM 34-12-34.

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