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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An air carrier large transport starts a descent during its leveloff phase and gets 400 ft below their assigned altitude before the captain manually recovered.
| Attributes | |
| ACN | 345330 |
| Time | |
| Date | 199608 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : bke |
| State Reference | OR |
| Altitude | msl bound lower : 37000 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute airway : zse |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 10000 flight time type : 800 |
| ASRS Report | 345330 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : undershoot non adherence : clearance non adherence : far |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
At FL369 autoplt engaged just prior to leveloff at FL370. Autoplt descended to FL366 then was disconnected and hand flown to FL370. Autoplt reengaged at FL370 and worked ok the rest of flight.
Original NASA ASRS Text
Title: AN ACR LGT STARTS A DSCNT DURING ITS LEVELOFF PHASE AND GETS 400 FT BELOW THEIR ASSIGNED ALT BEFORE THE CAPT MANUALLY RECOVERED.
Narrative: AT FL369 AUTOPLT ENGAGED JUST PRIOR TO LEVELOFF AT FL370. AUTOPLT DSNDED TO FL366 THEN WAS DISCONNECTED AND HAND FLOWN TO FL370. AUTOPLT REENGAGED AT FL370 AND WORKED OK THE REST OF FLT.
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.