# SDR UIEA2026041400181

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 14, 2026
- Submitted: April 15, 2026
- Operation: Air carrier
- Aircraft: [N249BA](https://openairdocs.org/aircraft/N249BA), registered now
- Make and model: Boeing 747409
- Aircraft serial: 24309
- Aircraft time: 89,108 hours, 16,929 cycles
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Adc
- Part number: 4040800915
- Part serial: 01036528
- Condition: Faulted
- Location: Zone 200
- 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/UIEA2026041400181

## Discrepancy

CAPTAINS AIRSPEED INDICATION UNRELIABLE. FO INDICATION APPEARED TO BE NORMAL(<P>LH AIR DATA COMPT FAILED. REMOVED & REPLACED REF LOG PAGES #2107407, 2107408,2107409 FOR FURTHER DETAILS</P> / <P>LP 2107408 M3&4: R/R L ADC IAW AMM 34-12-01/401 REV 116. REF IPC 34-12-01 SHEET 1 ITEM 1. GROUND TEST NORMAL, FAULT CLEARED. R/R ADC LT REF AMM 34-12-01 REV 116. INSTALLATION TEST OF THE ADC PASS, NO FAULTS. AIR DATA SYS OPERATIONAL TEST PASS, NO FAULTS, REF AMM 34-12-00/501 REV 116. REF IPC 34-12-01-01-105 REV 10. </P> / <P>LP 2107409 M5: MSG 21167 NUISANCE MSG, REF FIM 21-61 TASK 914 REV 116. NO ACTION REQ, CONTINUE SERVICE.</P>)

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