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An air carrier FK10 flight crew had to return to their departure airport when the MFDU started to display a 'liftdumpers unsafe' message accompanied by a master warning light.
| Attributes | |
| ACN | 364343 |
| Time | |
| Date | 199703 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : aus |
| State Reference | TX |
| Altitude | msl bound lower : 7000 msl bound upper : 7000 |
| Aircraft 1 | |
| Controlling Facilities | tracon : aus |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker 100 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 364343 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : declared emergency other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
Passing through 7000 ft MSL, the master warning light flashed, accompanied by a checklist on the MFDU. The caption 'liftdumpers unsafe' (liftdumper = ground spoiler lift/weight sensing actuator) appeared for a fraction of a second in red, then turned white. The MFDU was cleared and approximately 30 seconds later the same thing happened again. We notified austin departure control that we needed to return to austin for landing. The master warning light came on numerous times prior to landing, and the sequence of events were identical to the previous incidents described above. At austin, maintenance deactivated the liftdumpers in accordance with MEL. At XA00 we departed austin without any further problems.
Original NASA ASRS Text
Title: AN ACR FK10 FLC HAD TO RETURN TO THEIR DEP ARPT WHEN THE MFDU STARTED TO DISPLAY A 'LIFTDUMPERS UNSAFE' MESSAGE ACCOMPANIED BY A MASTER WARNING LIGHT.
Narrative: PASSING THROUGH 7000 FT MSL, THE MASTER WARNING LIGHT FLASHED, ACCOMPANIED BY A CHKLIST ON THE MFDU. THE CAPTION 'LIFTDUMPERS UNSAFE' (LIFTDUMPER = GND SPOILER LIFT/WT SENSING ACTUATOR) APPEARED FOR A FRACTION OF A SECOND IN RED, THEN TURNED WHITE. THE MFDU WAS CLRED AND APPROX 30 SECONDS LATER THE SAME THING HAPPENED AGAIN. WE NOTIFIED AUSTIN DEP CTL THAT WE NEEDED TO RETURN TO AUSTIN FOR LNDG. THE MASTER WARNING LIGHT CAME ON NUMEROUS TIMES PRIOR TO LNDG, AND THE SEQUENCE OF EVENTS WERE IDENTICAL TO THE PREVIOUS INCIDENTS DESCRIBED ABOVE. AT AUSTIN, MAINT DEACTIVATED THE LIFTDUMPERS IN ACCORDANCE WITH MEL. AT XA00 WE DEPARTED AUSTIN WITHOUT ANY FURTHER PROBS.
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.