# SDR 96ZZZX1158

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 22, 1996
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N2247R](https://openairdocs.org/aircraft/N2247R), registered now
- Make and model: Beech C90A
- Registry model: [Beech C90A](https://openairdocs.org/model/beech-c90a) (OpenAirDocs)
- Aircraft serial: LJ1352
- System (JASC): [2211 · Autopilot Computer](https://openairdocs.org/jasc/2211)
- Part: Computer
- Part number: KCP320
- Condition: Malfunctioned
- Location: Autopilot
- Stage of operation: AP
- Nature of condition: F
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/96ZZZX1158

## Discrepancy

GLIDESLOPE TRIES TO COUPLE A SIGNAL BEYOND THE PARAMETERS ESTABLISHED IN THE PILOT'S OPERATING HANDBOOK.  WHEN AUTOPILOT IS IN THE APPR CPLD MODE, THE GLIDESLOPE SIGNAL DROPS OUT AND COMES BACK, THE AUTOPILOT COMMANDS THE ACFT PITCH UP OR DOWN TO INTERCEPT THE GLIDESLOPE AT THE CLOSEST POINT.  IT WAS STRESSED REPEATEDLY TO ALLIED SIGNAL THAT DURING ONE PARTICULAR APPROACH, THIS ACFT PITCHED UP AND AIRSPEED DROPPED TO 90 KNOTS BEFORE THE PILOT COULD DISENGAGE THE AUTOPILOT AND REGAIN NORMAL FLIGHT PROFILE OF THE AIRCRAFT.

---
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.