# SDR DL75E081813

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 29, 2008
- Submitted: January 21, 2009
- Operation: Air carrier
- Aircraft: [N706TW](https://openairdocs.org/aircraft/N706TW), registered now
- Make and model: Boeing 757-2Q8
- Registry model: [Boeing 757-2Q8](https://openairdocs.org/model/boeing-757-2q8) (OpenAirDocs)
- Aircraft serial: 28165
- Aircraft time: 40,181 hours, 13,484 cycles
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Adc
- Part number: 4040800912
- Part serial: 96114811
- Condition: Inoperative
- Location: Right
- Stage of operation: CR
- How discovered: O
- Nature of condition: P
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DL75E081813

## Discrepancy

AIR TURN BACK, AFTER TAKEOFF MACH SPEED TRIM AND RUDDER RATIO EICAS MSG F/O AIRSPEED IND VERY SLOW TO INCREASE ABOVE 100KTS, LAGGED BEHIND CAPT AIRSPEED INDICATOR BY 30+ KNOTS.  REMOVED AND REPLACED RT ADC AND FCC IAW MM.

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