# SDR 99ZZZX2748

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 1, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N3974U](https://openairdocs.org/aircraft/N3974U), registered now
- Make and model: Cessna 150E
- Registry model: [Cessna 150E](https://openairdocs.org/model/cessna-150e) (OpenAirDocs)
- Aircraft serial: 15061374
- System (JASC): [3416 · Altimeter, Barometric/Encoder](https://openairdocs.org/jasc/3416)
- Part: Encoder
- Part number: KT78
- Condition: Broke
- Location: Cockpit
- Component: King
- Stage of operation: IN
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99ZZZX2748

## Discrepancy

TRANSPONDER MODE C REPORTED BY ATC AS BEING INVALID.  FOUND AND REPLACED BROKEN TEE CONNECTION IN SENSE LINE FOR ENCODER.

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