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A lear 45 first officer, the PF, was surprised by the autoplt's ballooning through the assigned altitude after it had annunciated altitude capture.
| Attributes | |
| ACN | 469995 |
| Time | |
| Date | 200004 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| State Reference | AR |
| Altitude | msl bound lower : 32700 msl bound upper : 33500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Gates Learjet Corp Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | climbout other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : atp pilot : cfi pilot : flight engineer |
| Experience | flight time last 90 days : 75 flight time total : 6900 flight time type : 200 |
| ASRS Report | 469995 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : far |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : overrode automation flight crew : returned to assigned altitude flight crew : overcame equipment problem |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Aircraft was climbing on autoplt, FGC modes navigation and flight crew. Approximately 300 ft below FL330, asel was annunciated indicating capture of the altitude. However, the aircraft continued to climb through FL330 and increased vertical speed. I disconnected the autoplt at FL332, stopped the climb at FL335 and descended down to FL330. The vertical modes have worked reliably in this aircraft up to now, but the lear 45's are so plagued with problems nothing would surprise me at this point. By the way, the TCASII didn't show any traffic and there didn't appear to be any conflict.
Original NASA ASRS Text
Title: A LEAR 45 FO, THE PF, WAS SURPRISED BY THE AUTOPLT'S BALLOONING THROUGH THE ASSIGNED ALT AFTER IT HAD ANNUNCIATED ALT CAPTURE.
Narrative: ACFT WAS CLBING ON AUTOPLT, FGC MODES NAV AND FLC. APPROX 300 FT BELOW FL330, ASEL WAS ANNUNCIATED INDICATING CAPTURE OF THE ALT. HOWEVER, THE ACFT CONTINUED TO CLB THROUGH FL330 AND INCREASED VERT SPD. I DISCONNECTED THE AUTOPLT AT FL332, STOPPED THE CLB AT FL335 AND DSNDED DOWN TO FL330. THE VERT MODES HAVE WORKED RELIABLY IN THIS ACFT UP TO NOW, BUT THE LEAR 45'S ARE SO PLAGUED WITH PROBS NOTHING WOULD SURPRISE ME AT THIS POINT. BY THE WAY, THE TCASII DIDN'T SHOW ANY TFC AND THERE DIDN'T APPEAR TO BE ANY CONFLICT.
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.