# SDR FDEA201803050606

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 5, 2018
- Submitted: March 6, 2018
- Operation: Air carrier
- Aircraft: [N920FD](https://openairdocs.org/aircraft/N920FD), registered now
- Make and model: Boeing 757-23A
- Registry model: [Boeing 757-23A](https://openairdocs.org/model/boeing-757-23a) (OpenAirDocs)
- Aircraft serial: 24289
- Aircraft time: 75,310 hours, 26,982 cycles
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Adc
- Condition: Fluctuates
- Location: Captain'S
- Stage of operation: TO
- How discovered: O
- Nature of condition: J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/FDEA201803050606

## Discrepancy

DURING TAKE OFF,  IMMEDIATELY AFTER SETTING POWER, CAPTAIN`S AIRSPEED AND ALTIMETER STARTED FLUCTUATING.  RUDDER RATIO ANNUNCIATED IN EICAS AND OVERHEAD. REJECT AIRSPEED WAS ESTIMATED AT 100KTNS ON FIRST OFFICER'S INDICATOR.  TROUBLESHOT IAW FIM 34-12-00-1,  LT AIR DATA COMPUTER REPLACED IAW AMM 34-12-01-4.  MCDP TEST 30 PERFORMED IAW AMM 22-00-02-2,  NO FAULTS PRESENT.   AIR DATA COMPUTING SYSTEM OPERATIONAL TEST PERFORMED IAW AMM 34-12-00-5.

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