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A cpr pilot, descending near jot, extended the speed brakes while using the autoplt for descent, causing a 300 ft pitch up.
| Attributes | |
| ACN | 494027 |
| Time | |
| Date | 200012 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : jot.vortac |
| State Reference | IL |
| Altitude | msl bound lower : 11000 msl bound upper : 11300 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : c90.tracon |
| Operator | general aviation : corporate |
| Make Model Name | Medium Transport |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other vortac |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time total : 11500 |
| ASRS Report | 494027 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem flight crew : overrode automation |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Ambiguous |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were level at 11000 ft. We were cleared to descend to 6000 ft. I was on autoplt. I needed to slow to 250 KTS, so I selected speed brakes while starting my descent. The aircraft pitched up 300 ft to 11300 ft instead of descending. I do not know why. I then took off the autoplt and hand flew the aircraft on descent. ATC did not say anything. I think the autoplt was not able to hold the aircraft with the pitch mode while selecting the speed brakes, which create a pitch-up movement on the aircraft.
Original NASA ASRS Text
Title: A CPR PLT, DSNDING NEAR JOT, EXTENDED THE SPD BRAKES WHILE USING THE AUTOPLT FOR DSCNT, CAUSING A 300 FT PITCH UP.
Narrative: WE WERE LEVEL AT 11000 FT. WE WERE CLRED TO DSND TO 6000 FT. I WAS ON AUTOPLT. I NEEDED TO SLOW TO 250 KTS, SO I SELECTED SPD BRAKES WHILE STARTING MY DSCNT. THE ACFT PITCHED UP 300 FT TO 11300 FT INSTEAD OF DSNDING. I DO NOT KNOW WHY. I THEN TOOK OFF THE AUTOPLT AND HAND FLEW THE ACFT ON DSCNT. ATC DID NOT SAY ANYTHING. I THINK THE AUTOPLT WAS NOT ABLE TO HOLD THE ACFT WITH THE PITCH MODE WHILE SELECTING THE SPD BRAKES, WHICH CREATE A PITCH-UP MOVEMENT ON THE ACFT.
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.