# SDR UIEA200400148

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 14, 2004
- Submitted: September 13, 2004
- Operation: Air carrier
- Aircraft: N524MC
- Make and model: Boeing 747-2D7B
- Registry model: [Boeing 747-2D7B](https://openairdocs.org/model/boeing-747-2d7b) (OpenAirDocs)
- Aircraft serial: 21784
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Computer
- Part number: 3751832
- Condition: Failed
- Location: Nr 2
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA200400148

## Discrepancy

MIA/LAX - EN ROUTE AFTER LEAVING MIAMI THE F/O PRESSURE ALTIMETER FLUCTUATING UNCONTROLLABLE AND MACH INDICATOR FLAP ALTERNATELY COMING IN VIEW.  WITH A DIFFERENCE IN MACH SPEED OF 6.5, CAPTAIN 79 MACH.  F/O .19 MACH INDICATED.  SUSPECT F/O CADS.  REMOVED AND REPLACED CADC NR 2.  OPS CHECK OK IAW REF MM 34-12-01.  (M)

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