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L1011 cleared to descend to 11000 ft, got to 10200 ft before returning to 11000 ft. Autoflt captured altitude but aircraft continued to descend.
| Attributes | |
| ACN | 358740 |
| Time | |
| Date | 199701 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : sfo |
| State Reference | CA |
| Altitude | msl bound lower : 10200 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : oak |
| Operator | common carrier : air carrier |
| Make Model Name | L-1011 Tri-Star All Series |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 16500 |
| ASRS Report | 358740 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Cleared to descend to 11000 ft by approach control. Autoplt on. Autoflt mode captured altitude, but aircraft continued to descend. Overshoot to 10200 ft with immediate climb back to 11000 ft. No word from ATC. Remainder of flight normal.
Original NASA ASRS Text
Title: L1011 CLRED TO DSND TO 11000 FT, GOT TO 10200 FT BEFORE RETURNING TO 11000 FT. AUTOFLT CAPTURED ALT BUT ACFT CONTINUED TO DSND.
Narrative: CLRED TO DSND TO 11000 FT BY APCH CTL. AUTOPLT ON. AUTOFLT MODE CAPTURED ALT, BUT ACFT CONTINUED TO DSND. OVERSHOOT TO 10200 FT WITH IMMEDIATE CLB BACK TO 11000 FT. NO WORD FROM ATC. REMAINDER OF FLT NORMAL.
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.