# SDR WVBA2001012

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 20, 2001
- Submitted: March 13, 2001
- Operation: Air carrier
- Aircraft: [N4434D](https://openairdocs.org/aircraft/N4434D), registered now
- Make and model: Piper PA-31-350
- Registry model: [Piper PA-31-350](https://openairdocs.org/model/piper-pa-31-350) (OpenAirDocs)
- Aircraft serial: 317552020
- Engine: Lyc TIO540J2BD
- System (JASC): [2211 · Autopilot Computer](https://openairdocs.org/jasc/2211)
- Part: Computer
- Part number: 011033T
- Part serial: 5325
- Condition: Unserviceable
- Location: Pitch Control
- Stage of operation: NR
- How discovered: O
- Nature of condition: F
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/WVBA2001012

## Discrepancy

AFTER INITIAL INSTALL AIRCRAFT WAS ON CHECK FLIGHT, IN ALTITUDE HOLD, AIRCRAFT PORPOISES.  IT WAS DETERMINED THAT THE PITCH COMPUTER WAS THE CAUSE.  UNIT WAS REMOVED FOR ANALYSIS.

---
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.