# SDR UIEA2026042000226

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 20, 2026
- Submitted: April 22, 2026
- Operation: Air carrier
- Aircraft: [N249BA](https://openairdocs.org/aircraft/N249BA), registered now
- Make and model: Boeing 747409
- Aircraft serial: 24309
- Aircraft time: 89,110 hours, 16,925 cycles
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Adc
- Part number: 4040800915
- Part serial: 32392915
- Condition: Faulted
- Location: Left
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2026042000226

## Discrepancy

CAPTAIN AIRSPEED DROPPED FROM 250 KNOTS TO MINIMUM ON CLIMBOUT.  PERFORMED LEAK CHK OF CAPT'S AND FO'S PITOT STATIC SYS IAW IAW 34-11-00, VERIFIED AIRSPEED DROPPED 250 KNOTS AND CAME BACK TO NORMAL. R & R LH ADC AND REPEATED LK CHK, AIR SPEED STABLE AT 300 KNOTS WITH LOSS OF 2 KNOTS IN 5 MINUTES. WITHIN LIMITS PER AMM 34-11-00-795-019.

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