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Altitude excursion in a BE20 when the altitude hold automatic trips off due to a design problem, after a 4000 ft altitude overshoot.
| Attributes | |
| ACN | 510230 |
| Time | |
| Date | 200105 |
| Day | Fri |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | navaid : sns.vortac |
| State Reference | CA |
| Altitude | msl bound lower : 29000 msl bound upper : 29250 |
| Aircraft 1 | |
| Operator | general aviation : corporate |
| Make Model Name | Super King Air 200 HDC |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : multi engine pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 11000 flight time type : 7100 |
| ASRS Report | 510230 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance |
| Resolutory Action | flight crew : returned to assigned altitude flight crew : became reoriented |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Moving papers around the center console moved the pitch trim wheel on the autoplt. The slightest movement causes the autoplt to turn off altitude hold. At FL250 the altitude alarm sounded and was able to correct back to FL290. No conflict was noted by ATC. This has been a problem in the past. A fix would require depressing the altitude hold to off, then use the pitch trim on the autoplt.
Original NASA ASRS Text
Title: ALT EXCURSION IN A BE20 WHEN THE ALT HOLD AUTO TRIPS OFF DUE TO A DESIGN PROB, AFTER A 4000 FT ALT OVERSHOOT.
Narrative: MOVING PAPERS AROUND THE CTR CONSOLE MOVED THE PITCH TRIM WHEEL ON THE AUTOPLT. THE SLIGHTEST MOVEMENT CAUSES THE AUTOPLT TO TURN OFF ALT HOLD. AT FL250 THE ALT ALARM SOUNDED AND WAS ABLE TO CORRECT BACK TO FL290. NO CONFLICT WAS NOTED BY ATC. THIS HAS BEEN A PROB IN THE PAST. A FIX WOULD REQUIRE DEPRESSING THE ALT HOLD TO OFF, THEN USE THE PITCH TRIM ON THE AUTOPLT.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.