# SDR UIEA2024042200305

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 22, 2024
- Submitted: April 24, 2024
- Operation: Air carrier
- Aircraft: [N412MC](https://openairdocs.org/aircraft/N412MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 30559
- Aircraft time: 96,477 hours, 15,633 cycles
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Adc
- Part number: 4040800911
- Part serial: 97044963
- Condition: Faulted
- Location: Right
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: J, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2024042200305

## Discrepancy

DURING FLIGHT BUFFET MARGIN AND STALL SPEED MARGIN DISPLAYS WERE DIFFERENT BY +/- 20KIAS FROM LEFT AND RIGHT DISPLAYS(<P>DFDR DATA DOWNLOADED & SENT TO HDQ PER AMM 31-31-01 REV 110. AOA SENSOR TEST OK (NO LIGHT) PER AMM 34-12-03 REV 110. AS PER REQUEST, R/R RH AOA SENSOR PER  34-12-03 REV 110. R/R LH AOA SENSOR PER AMM 34-12-03 REV 110. ACCOMPLISHED BOEING RECOMMENDED YLS-TLS 24--0392-02B, 1/03B & -05B. ACCOMPLISHED R/R LH & RH ADC & OPS CHECK NORMAL PER AMM 34-12-01 REV 110. R/R JETT NOZZLE VALVE & ACTUATOR PER AMM 28-31-03 & 28-31-04 ERV 110. LEAK TEST OK PER AMM 28-31-03 REV 110. ACCOMPLISHED TLS-24-0392-09B. NOTIFIED MCC & OK TO CLOSE. RETURN TO SERVICE.</P>)

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