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A CL65 first officer, with only 100 hours on the aircraft, reported that the autoplt did not capture the assigned altitude. After engaging the autoplt a second time, the aircraft began to descend again and the captain stopped the descent.
| Attributes | |
| ACN | 451581 |
| Time | |
| Date | 199910 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : csn.vortac |
| State Reference | VA |
| Altitude | msl bound lower : 27100 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet CL65, Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 2900 flight time type : 100 |
| ASRS Report | 451581 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude altitude deviation : overshoot non adherence : clearance non adherence : far |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : returned to assigned altitude flight crew : overrode automation |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Descending through our assigned altitude of FL280, autoplt did not level off and the descent continued until the captain disengaged the autoplt and manually initiated a climb (lowest altitude reached was FL271). Upon reaching FL280 (assigned altitude), autoplt was engaged again, and commanded/initiated a descent unexpectedly. This time the descent was manually stopped by the captain at FL275 and the aircraft was returned to FL280. Autoplt was engaged again and performed normally thereafter. No traffic conflict occurred nor was reported.
Original NASA ASRS Text
Title: A CL65 FO, WITH ONLY 100 HRS ON THE ACFT, RPTED THAT THE AUTOPLT DID NOT CAPTURE THE ASSIGNED ALT. AFTER ENGAGING THE AUTOPLT A SECOND TIME, THE ACFT BEGAN TO DSND AGAIN AND THE CAPT STOPPED THE DSCNT.
Narrative: DSNDING THROUGH OUR ASSIGNED ALT OF FL280, AUTOPLT DID NOT LEVEL OFF AND THE DSCNT CONTINUED UNTIL THE CAPT DISENGAGED THE AUTOPLT AND MANUALLY INITIATED A CLB (LOWEST ALT REACHED WAS FL271). UPON REACHING FL280 (ASSIGNED ALT), AUTOPLT WAS ENGAGED AGAIN, AND COMMANDED/INITIATED A DSCNT UNEXPECTEDLY. THIS TIME THE DSCNT WAS MANUALLY STOPPED BY THE CAPT AT FL275 AND THE ACFT WAS RETURNED TO FL280. AUTOPLT WAS ENGAGED AGAIN AND PERFORMED NORMALLY THEREAFTER. NO TFC CONFLICT OCCURRED NOR WAS RPTED.
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.