# SDR 99ZZZX3141

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 1, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N44996](https://openairdocs.org/aircraft/N44996), registered now
- Make and model: Piper PA-28-161
- Registry model: [Piper PA-28-161](https://openairdocs.org/model/piper-pa-28-161) (OpenAirDocs)
- Aircraft serial: 287816054
- System (JASC): [3416 · Altimeter, Barometric/Encoder](https://openairdocs.org/jasc/3416)
- Part: Encoder
- Condition: Malfunctioned
- Location: Cockpit
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99ZZZX3141

## Discrepancy

FOUND THE APOLLO ALT ENCODER PLUS 700 FEET ON INITIAL EVALUATION.  ADJUSTED AND RAN IT UP TO 20,000 FEET AND ERRORS WERE WITHIN ACCEPTABLE TOLERANCE.  REPAIRED A STATIC LEAK (OPEN) AT THE PITOT STATIC MAST ASSY AND CHECKED STATIC AND TRANSPONDER GOOD.  COULD NOT ISOLATE CAUSE OF 'INVALID' TO SPECIFIC COMPONENT.

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