# SDR 95ZZZX6761

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 25, 1995
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: N9170T
- Make and model: Mooney M20R
- Registry model: [Mooney M20R](https://openairdocs.org/model/mooney-m20r) (OpenAirDocs)
- Aircraft serial: 290033
- System (JASC): [3416 · Altimeter, Barometric/Encoder](https://openairdocs.org/jasc/3416)
- Part: Encoder
- Part number: AT3000
- Condition: Not Compatible
- Location: Cockpit
- Stage of operation: IN
- Nature of condition: W
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/95ZZZX6761

## Discrepancy

FAILED ENCODER REMOVED AND REPLACED.  NEW ENCODER FAILED TO WORK.  FOUND THAT WHILE BOTH UNITS HAD THE SAME PART NUMBER (0900-4099-01), THE NEW UNIT IS NOT PLUG COMPATIBLE.  SUBMITTER SUGGESTS AN UNDOCUMENTED DESIGN CHANGE BY THE FACTORY IS THE CAUSE OF THIS PROBLEM.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.