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Flight crew of B757 has problem with flight director remaining in altitude hold mode after intermediate leveloff. Pitch bars indicated a climb. During troubleshooting the problem they had an altitude excursion of 400 ft.
| Attributes | |
| ACN | 387160 |
| Time | |
| Date | 199711 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : mia airport : fll |
| State Reference | FL |
| Altitude | msl bound lower : 11000 msl bound upper : 11400 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mia |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : instrument pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 240 flight time total : 10000 flight time type : 5000 |
| ASRS Report | 387160 |
| 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 | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
On climb out from fll the flight director stayed in an 'altitude hold' mode after an intermediate leveloff. However, the pitch bars gave a climb indication. Autothrottles clicked off and 'power mode' was lost. Could not restore flight director out of 'altitude hold' mode back into 'VNAV.' while working on problem, exceeded altitude of 11000 ft by 400 ft. Turned everything off and flew raw data to 11000 ft. I was finally able to restore 'VNAV' after 2 reset attempts. Did not get autothrottles back until coming out of climb mode at 25000 ft.
Original NASA ASRS Text
Title: FLC OF B757 HAS PROB WITH FLT DIRECTOR REMAINING IN ALT HOLD MODE AFTER INTERMEDIATE LEVELOFF. PITCH BARS INDICATED A CLB. DURING TROUBLESHOOTING THE PROB THEY HAD AN ALT EXCURSION OF 400 FT.
Narrative: ON CLBOUT FROM FLL THE FLT DIRECTOR STAYED IN AN 'ALT HOLD' MODE AFTER AN INTERMEDIATE LEVELOFF. HOWEVER, THE PITCH BARS GAVE A CLB INDICATION. AUTOTHROTTLES CLICKED OFF AND 'PWR MODE' WAS LOST. COULD NOT RESTORE FLT DIRECTOR OUT OF 'ALT HOLD' MODE BACK INTO 'VNAV.' WHILE WORKING ON PROB, EXCEEDED ALT OF 11000 FT BY 400 FT. TURNED EVERYTHING OFF AND FLEW RAW DATA TO 11000 FT. I WAS FINALLY ABLE TO RESTORE 'VNAV' AFTER 2 RESET ATTEMPTS. DID NOT GET AUTOTHROTTLES BACK UNTIL COMING OUT OF CLB MODE AT 25000 FT.
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.