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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An air carrier flight crew of a B737-200 was surprised when the aircraft overshot their assigned altitude. The flight crew suspects that the 'B' channel autoplt malfunctioned.
| Attributes | |
| ACN | 426040 |
| Time | |
| Date | 199901 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : joh |
| State Reference | AK |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-200 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer |
| Experience | flight time last 90 days : 200 flight time total : 13000 flight time type : 5000 |
| ASRS Report | 426040 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 80 flight time total : 8000 flight time type : 300 |
| ASRS Report | 425446 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : far |
| Independent Detector | other flight crewa |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | Pilot Deviation |
Narrative:
B737-200 advanced model with CAT ii dual channel autoplt. Autoplt in 'B' channel, 'altitude held' blew through FL330. We MEL'ed and pulled circuit breaker on 'B' channel autoplt.
Original NASA ASRS Text
Title: AN ACR FLC OF A B737-200 WAS SURPRISED WHEN THE ACFT OVERSHOT THEIR ASSIGNED ALT. THE FLC SUSPECTS THAT THE 'B' CHANNEL AUTOPLT MALFUNCTIONED.
Narrative: B737-200 ADVANCED MODEL WITH CAT II DUAL CHANNEL AUTOPLT. AUTOPLT IN 'B' CHANNEL, 'ALT HELD' BLEW THROUGH FL330. WE MEL'ED AND PULLED CIRCUIT BREAKER ON 'B' CHANNEL AUTOPLT.
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.