# SDR CA040130001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 25, 2004
- Submitted: March 1, 2004
- Operation: General aviation
- Make and model: Bombdr DHC8400
- Engine: Pwc PW150A
- Propeller: Rotol CR4086123F17
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Adc
- Part number: C17053AC03
- Part serial: 471
- Condition: Inoperative
- Location: Cockpit
- Stage of operation: LD
- 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/CA040130001

## Discrepancy

(CAN) DURING LANDING ROLL OUT IAS MISMATCH MESSAGE APPEARED, NR 1 IAS WAS 30 KTS HIGHER THAN NR 2 IAS.  AFTER PARKING AT THE ARRIVAL GATE,  NR 1 IAS INDICTED 38 KTS AND TAS WAS SCROLLING.  NR 2 IAS STEADY AT 30 KTS (NORMAL).  MAINTENANCE PURGED NR 1 PITOT/STATIC LINES THEN RECONNECTED.  NR 1 IAS CONTINUED TO FLUCTUATE AT 38 KTS FOR SEVERAL MINUTES THEN DROPPED TO 30 KTS AND BECAME STEADY. NR 1 ADU REPLACED.

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