 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
A B777 flight crew notice that the altitude capture failed during a descent and aircraft descended 200 ft below assigned altitude before the flight crew could react.
| Attributes | |
| ACN | 622261 |
| Time | |
| Date | 200305 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : eddf.airport |
| State Reference | FO |
| Altitude | msl bound lower : 7800 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : eddf.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other |
| Flight Phase | descent : intermediate altitude descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 232 flight time total : 15000 flight time type : 1825 |
| ASRS Report | 622261 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : far non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to assigned altitude |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
On vector to runway 25L, told to descend to 8000 ft and turn to heading 170 degrees. Selected flight level change and heading select. I called 'approaching 8000 ft,' aircraft failed to level off. I disconnected the autoplt and arrested descent at approximately 7800 ft. All 4 pilots in the cockpit witnessed event and have no explanation.
Original NASA ASRS Text
Title: A B777 FLT CREW NOTICE THAT THE ALT CAPTURE FAILED DURING A DSCNT AND ACFT DSNDED 200 FT BELOW ASSIGNED ALT BEFORE THE FLT CREW COULD REACT.
Narrative: ON VECTOR TO RWY 25L, TOLD TO DSND TO 8000 FT AND TURN TO HDG 170 DEGS. SELECTED FLT LEVEL CHANGE AND HDG SELECT. I CALLED 'APCHING 8000 FT,' ACFT FAILED TO LEVEL OFF. I DISCONNECTED THE AUTOPLT AND ARRESTED DSCNT AT APPROX 7800 FT. ALL 4 PLTS IN THE COCKPIT WITNESSED EVENT AND HAVE NO EXPLANATION.
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.