# SDR UPS06546008

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 23, 2006
- Submitted: January 23, 2006
- Operation: Air carrier
- Aircraft: [N428UP](https://openairdocs.org/aircraft/N428UP), registered now
- Make and model: Boeing 757-24APF
- Registry model: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (OpenAirDocs)
- Aircraft serial: 25459
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Adc
- Part number: 4040800912
- Part serial: 90072286
- Condition: Malfunctioned
- Location: Cockpit
- Stage of operation: IN
- How discovered: O
- Nature of condition: N
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UPS06546008

## Discrepancy

ATB - IMMEDIATELY AFTER TAKEOFF, L ADC FAILED.  FLAGS APPEARED ON CAPTAINS AIRSPEED, ALTIMETER AND IVSI.  OVERSPEED WARNING OCCURRED EVERY FEW SECONDS THROUGHOUT CLIMB, LEVEL OFF, APPROACH AND TAXI-IN.  SELECTED ALTERNATE ADC AND CAPTAINS RESTORED, BUT OVERSPEED WARNINGS CONTINUED.  PERFORMED AIR TURN BACK.  REMOVED AND REPLACED LT ADC IAW AMM 34-12-01-4.

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