# SDR UIEA2022032600242

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 26, 2022
- Submitted: March 28, 2022
- Operation: Air carrier
- Aircraft: [N492MC](https://openairdocs.org/aircraft/N492MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 29253
- Aircraft time: 97,959 hours
- System (JASC): [3412 · Outside Air Temperature Indicator/Sensor](https://openairdocs.org/jasc/3412)
- Part: Aoa
- Part number: 0861DR
- Part serial: 0346
- Condition: Failed
- Stage of operation: CR
- How discovered: V
- Nature of condition: G, J, S
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2022032600242

## Discrepancy

CREW REPORTED AUTOPILOT FAILURES, SINGLE IRU MODE, MULTIPLE ADC ISSUES, WHICH WERE CONFIRMED IN AHM.(<P ><SPAN>REPLACED LEFT AIR DATA COMPUTER. DURING OPS CHECK, LEFT ANGLE OF ATTACK SENSOR FAILED. REMOVED AND REPLACED LEFT ANGLE OF ATTACK SENSOR IAW AMM 34-12-03-404-148. OPS CHECK GOOD.</SPAN></P> / <P> </P>)

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