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|
Attributes | |
ACN | 130539 |
Time | |
Date | 198912 |
Day | Fri |
Local Time Of Day | 1201 To 1800 |
Place | |
Locale Reference | airport : pbi |
State Reference | FL |
Altitude | msl bound lower : 10000 msl bound upper : 10300 |
Environment | |
Flight Conditions | IMC |
Light | Daylight |
Aircraft 1 | |
Controlling Facilities | artcc : zma |
Operator | common carrier : air carrier |
Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
Navigation In Use | Other Other |
Flight Phase | climbout : intermediate altitude |
Flight Plan | IFR |
Person 1 | |
Affiliation | company : air carrier |
Function | flight crew : captain oversight : pic |
Qualification | pilot : cfi pilot : atp |
Experience | flight time last 90 days : 150 flight time total : 5002 flight time type : 2470 |
ASRS Report | 130539 |
Person 2 | |
Affiliation | company : air carrier |
Function | flight crew : first officer |
Qualification | pilot : instrument pilot : commercial |
Events | |
Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance |
Independent Detector | other flight crewa |
Resolutory Action | flight crew : returned to intended course or assigned course flight crew : overcame equipment problem |
Consequence | Other |
Supplementary | |
Primary Problem | Flight Crew Human Performance |
Air Traffic Incident | Pilot Deviation |
Narrative:
During climb out the aircraft was on autoplt and coupled to the performance computer. The first officer was flying. 10000' was set and armed in the altitude window. The aircraft leveled off at 10000', and the FMA showed that it was in the performance cruise mode. It was accelerating and the first officer was entering a cruise speed of 280 KTS in the performance computer. I was doing the 10000' check. The altitude warning horn went off at 10200'. The first officer disengaged the autoplt and autothrottles and flew it back to 10000'. We had reached 10300' before going back to 10000'. We inspected the performance computer and discovered it had dumped some of its data and would not accept commands. Should we trust these computers? One never knows when they will fail!
Original NASA ASRS Text
Title: ACR MLG AUTOPLT FAILS TO CAPTURE ALT IN CLIMB.
Narrative: DURING CLBOUT THE ACFT WAS ON AUTOPLT AND COUPLED TO THE PERFORMANCE COMPUTER. THE F/O WAS FLYING. 10000' WAS SET AND ARMED IN THE ALT WINDOW. THE ACFT LEVELED OFF AT 10000', AND THE FMA SHOWED THAT IT WAS IN THE PERFORMANCE CRUISE MODE. IT WAS ACCELERATING AND THE F/O WAS ENTERING A CRUISE SPD OF 280 KTS IN THE PERFORMANCE COMPUTER. I WAS DOING THE 10000' CHK. THE ALT WARNING HORN WENT OFF AT 10200'. THE F/O DISENGAGED THE AUTOPLT AND AUTOTHROTTLES AND FLEW IT BACK TO 10000'. WE HAD REACHED 10300' BEFORE GOING BACK TO 10000'. WE INSPECTED THE PERFORMANCE COMPUTER AND DISCOVERED IT HAD DUMPED SOME OF ITS DATA AND WOULD NOT ACCEPT COMMANDS. SHOULD WE TRUST THESE COMPUTERS? ONE NEVER KNOWS WHEN THEY WILL FAIL!
Data retrieved from NASA's ASRS site as of August 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.