# SDR 20000407SH027

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 9, 2000
- Submitted: April 7, 2000
- Operation: General aviation
- Aircraft: [N4145X](https://openairdocs.org/aircraft/N4145X), registered now
- Make and model: Piper PA-28-181
- Registry model: [Piper PA-28-181](https://openairdocs.org/model/piper-pa-28-181) (OpenAirDocs)
- Aircraft serial: 2843152
- System (JASC): [3416 · Altimeter, Barometric/Encoder](https://openairdocs.org/jasc/3416)
- Part: Encoder
- Part number: AR850
- Part serial: 15091
- Condition: Leaking
- Location: Cockpit
- Part time: 1,177 hours
- Stage of operation: IN
- How discovered: V
- Nature of condition: K
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/20000407SH027

## Discrepancy

INTERNAL LEAK IN ALTITUDE ENCODER GREATER THAN THE ALLOWED 100 FEET/MINUTE NON- PRESSURIZED AIRCRAFT.  THESE ENCODERS ARE NORMALLY VERY REALIABLE, YET RECERTIFICATION SINCE PIPER AIRCRAFT INSTALLATION.  POSSIBLE NARCO MANUFACTURE DEFECT IN ASSEMBLY OF PRESSURE SENSOR.  LEAKS AROUND GLUE JOINT IN SENSOR.  (X)

---
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.