# SDR IPXA10561072

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 8, 2010
- Submitted: July 12, 2010
- Operation: Air carrier
- Aircraft: [N405UP](https://openairdocs.org/aircraft/N405UP), registered now
- Make and model: Boeing 757-24APF
- Registry model: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (OpenAirDocs)
- Aircraft serial: 23727
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Adc
- Part number: 4040800912
- Part serial: 87061104
- Condition: Inoperative
- Location: Cockpit
- Stage of operation: DE
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA10561072

## Discrepancy

PRIOR TO TOP OF DESCENT, CAPT IAS SHOWED A 30KT OVERSPEED WITH ATTENDANT WARNINGS, EICAS MESSAGES FOR RUDDER RATIO AND MACH SPEED TRIM F/O AIRSPEED INDICATOR DID NOT SHOW AN OVERSPEED.  PITCH AND POWER CONFIRMED.  EMERGENCY DECLARED.  CAPT AIR DATA COMPUTER REPLACED, TESTED SERVICABLE IAW AMM 34-12-00-5. LOW LEVEL CHECK CARRIED OUT SERV IAW MM 34-11-00-5. SEE LP 347116/1 FOR REPLACEMENT OF RT ADC.

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