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An A300 at FL300 had both flight management screens go blank and #1 autoplt disconnected. When #1 autoplt engaged; yoke moved forward then disconnected.
| Attributes | |
| ACN | 689452 |
| Time | |
| Date | 200603 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : zob.artcc |
| State Reference | US |
| Altitude | msl bound lower : 30000 msl bound upper : 30290 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level ground : maintenance |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 4 flight time total : 6050 flight time type : 1650 |
| ASRS Report | 689452 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 128 flight time total : 11800 flight time type : 1000 |
| ASRS Report | 689455 |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude |
| Independent Detector | aircraft equipment other aircraft equipment : fmc 'fail' messsage other flight crewa other flight crewb |
| Resolutory Action | flight crew : regained aircraft control |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
While en route at FL300; approximately 60 mi east of slt with autoplt #1 engaged; ATC cleared us direct to ape. Captain was flying. First officer on the radio. The #1 FMC was used to enter direct to ape. After ape was executed; both FMC screens blanked and the #1 autoplt disconnected and the aircraft started an immediate climb. FMC screens came back up with a 'please wait' message in the scratch pad. Captain leveled off back at FL300 after a climb to FL302.9. After the re-level at FL300; #2 flight director fail message appeared with loss of flight director on first officer side; message remained for several seconds. When aircraft was level and in trim; #1 autoplt was re-engaged. The yoke immediately moved forward with force and autoplt #1 disconnected again. After aircraft was stabilized; #2 autoplt was engaged without further incident. Upon landing; thorough debrief with maintenance took place. We noted a failure light for an event in-flight was recorded on the maintenance panel. Callback conversation with reporter revealed the following information: the reporter stated the cause of the dual FMS failure and the #1 autoplt failure is unknown. #2 autoplt functioned normally and was used the remainder of the flight. Maintenance has released no information on the action taken.
Original NASA ASRS Text
Title: AN A300 AT FL300 HAD BOTH FLT MGMNT SCREENS GO BLANK AND #1 AUTOPLT DISCONNECTED. WHEN #1 AUTOPLT ENGAGED; YOKE MOVED FORWARD THEN DISCONNECTED.
Narrative: WHILE ENRTE AT FL300; APPROX 60 MI E OF SLT WITH AUTOPLT #1 ENGAGED; ATC CLRED US DIRECT TO APE. CAPT WAS FLYING. FO ON THE RADIO. THE #1 FMC WAS USED TO ENTER DIRECT TO APE. AFTER APE WAS EXECUTED; BOTH FMC SCREENS BLANKED AND THE #1 AUTOPLT DISCONNECTED AND THE ACFT STARTED AN IMMEDIATE CLB. FMC SCREENS CAME BACK UP WITH A 'PLEASE WAIT' MESSAGE IN THE SCRATCH PAD. CAPT LEVELED OFF BACK AT FL300 AFTER A CLB TO FL302.9. AFTER THE RE-LEVEL AT FL300; #2 FLT DIRECTOR FAIL MESSAGE APPEARED WITH LOSS OF FLT DIRECTOR ON FO SIDE; MESSAGE REMAINED FOR SEVERAL SECONDS. WHEN ACFT WAS LEVEL AND IN TRIM; #1 AUTOPLT WAS RE-ENGAGED. THE YOKE IMMEDIATELY MOVED FORWARD WITH FORCE AND AUTOPLT #1 DISCONNECTED AGAIN. AFTER ACFT WAS STABILIZED; #2 AUTOPLT WAS ENGAGED WITHOUT FURTHER INCIDENT. UPON LNDG; THOROUGH DEBRIEF WITH MAINT TOOK PLACE. WE NOTED A FAILURE LIGHT FOR AN EVENT INFLT WAS RECORDED ON THE MAINT PANEL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE DUAL FMS FAILURE AND THE #1 AUTOPLT FAILURE IS UNKNOWN. #2 AUTOPLT FUNCTIONED NORMALLY AND WAS USED THE REMAINDER OF THE FLT. MAINT HAS RELEASED NO INFO ON THE ACTION TAKEN.
Data retrieved from NASA's ASRS site as of January 2009 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.