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PF climbs on autoplt in vertical speed mode toward FL290. ATC assigns FL230 just prior to reaching FL290. PNF resets FL230 in the altitude window. The autoplt no longer has a target of FL290 and continues climbing through FL290 to FL295 before PF stops the climb. Captain notifies ARTCC of altitude overshoot.
| Attributes | |
| ACN | 322180 |
| Time | |
| Date | 199511 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : zau |
| State Reference | IL |
| Altitude | msl bound lower : 29000 msl bound upper : 29500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | general aviation : corporate |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 88 flight time total : 3800 |
| ASRS Report | 322180 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were at FL270 and requested higher due to turbulence. We were assigned FL290. I was flying and engaged the autoplt. We climbed through FL280 and got the 1000 ft altitude horn. I called 1000 ft to go and checked the autoplt command panel. All was as it should be, altitude select and vertical speed were selected. The captain also called FL280 for FL290. ATC then advised us to cross 60 mi west of polar at FL230. The captain set FL230 in the altitude window. At FL290 I realized the autoplt was not going to level at FL290. I began corrective action smoothly, so as not to injure passenger in the back. The captain advised ATC we were at FL295 due to autoplt problem and were descending to FL230. Nothing more was said, but I will monitor the autoplt more diligently from now on.
Original NASA ASRS Text
Title: PF CLBS ON AUTOPLT IN VERT SPD MODE TOWARD FL290. ATC ASSIGNS FL230 JUST PRIOR TO REACHING FL290. PNF RESETS FL230 IN THE ALT WINDOW. THE AUTOPLT NO LONGER HAS A TARGET OF FL290 AND CONTINUES CLBING THROUGH FL290 TO FL295 BEFORE PF STOPS THE CLB. CAPT NOTIFIES ARTCC OF ALT OVERSHOOT.
Narrative: WE WERE AT FL270 AND REQUESTED HIGHER DUE TO TURB. WE WERE ASSIGNED FL290. I WAS FLYING AND ENGAGED THE AUTOPLT. WE CLBED THROUGH FL280 AND GOT THE 1000 FT ALT HORN. I CALLED 1000 FT TO GO AND CHKED THE AUTOPLT COMMAND PANEL. ALL WAS AS IT SHOULD BE, ALT SELECT AND VERT SPD WERE SELECTED. THE CAPT ALSO CALLED FL280 FOR FL290. ATC THEN ADVISED US TO CROSS 60 MI W OF POLAR AT FL230. THE CAPT SET FL230 IN THE ALT WINDOW. AT FL290 I REALIZED THE AUTOPLT WAS NOT GOING TO LEVEL AT FL290. I BEGAN CORRECTIVE ACTION SMOOTHLY, SO AS NOT TO INJURE PAX IN THE BACK. THE CAPT ADVISED ATC WE WERE AT FL295 DUE TO AUTOPLT PROB AND WERE DSNDING TO FL230. NOTHING MORE WAS SAID, BUT I WILL MONITOR THE AUTOPLT MORE DILIGENTLY FROM NOW ON.
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.