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Profile descent with rapid rate in autoplt. Autoplt failed to level at 10000'. Overshot to 9750'. First officer pushed vertical speed and then altitude hold at 10000'.
| Attributes | |
| ACN | 161777 |
| Time | |
| Date | 199011 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : sfo |
| State Reference | CA |
| Altitude | msl bound lower : 9730 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : oak |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| Route In Use | arrival : profile descent arrival other enroute airway : zoa |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 210 flight time total : 4000 flight time type : 650 |
| ASRS Report | 161777 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : instrument pilot : commercial pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 100 flight time total : 10000 flight time type : 500 |
| ASRS Report | 161946 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : regained aircraft control flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Flight guidance failed to capture altitude. Altitude was set and armed for 10000'. Altitude window annunciated altitude capture at 10000' MSL. Aircraft was still descending. I then pushed the altitude hold button. Aircraft immediately started to level off and climbed back to 1000' MSL. The lowest the aircraft descended during this event was 9750' MSL.
Original NASA ASRS Text
Title: PROFILE DESCENT WITH RAPID RATE IN AUTOPLT. AUTOPLT FAILED TO LEVEL AT 10000'. OVERSHOT TO 9750'. FO PUSHED VERTICAL SPEED AND THEN ALT HOLD AT 10000'.
Narrative: FLT GUIDANCE FAILED TO CAPTURE ALT. ALT WAS SET AND ARMED FOR 10000'. ALT WINDOW ANNUNCIATED ALT CAPTURE AT 10000' MSL. ACFT WAS STILL DSNDING. I THEN PUSHED THE ALT HOLD BUTTON. ACFT IMMEDIATELY STARTED TO LEVEL OFF AND CLBED BACK TO 1000' MSL. THE LOWEST THE ACFT DSNDED DURING THIS EVENT WAS 9750' MSL.
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.