# SDR IPXA11M64662

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 8, 2011
- Submitted: February 9, 2011
- Operation: Air carrier
- Aircraft: N277UP
- Make and model: Doug MD-11F
- Registry model: [Doug MD-11F](https://openairdocs.org/model/mcdonnell-douglas-md-11f) (OpenAirDocs)
- Aircraft serial: 48578
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Adc
- Condition: Inoperative
- Location: Cockpit
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA11M64662

## Discrepancy

AFTER T/O AIRSPEED DIFF OF 15KNTS CAPTAIN'S LOWER THAN F/O.  DURING CLIMB AIRSPEED CLOSED TO WITHIN 5 KNOTS, CAPTAIN ALWAYS LOWER.  AMBER IAS ALERT.  PERFORMED PITOT STATIC LEAK CHECK IAW AMM 34-11-00-2, LEAK CHECK WAS GOOD, FOUND A SPLIT BETWEEN CAPT'S AND F/O'S AIRSPEED INDICATION.  R & R NR 1 ADC IAW AMM 34-16-01-4 AND 34-16-01-5, ALL CHECKS ARE GOOD.

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