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The left wing ground spoiler on an mdt came out in turbulence. It broke free and retracted when the aircraft sped up in descent.
| Attributes | |
| ACN | 220642 |
| Time | |
| Date | 199209 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : roa |
| State Reference | VA |
| Altitude | msl bound lower : 8000 msl bound upper : 17000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Transport, High Wing, 2 Turboprop Eng |
| Flight Phase | climbout : intermediate altitude cruise other descent other |
| Route In Use | enroute airway : zdc |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 280 flight time total : 8000 flight time type : 3000 |
| ASRS Report | 220642 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : overcame equipment problem |
| Consequence | other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
During climb to cruise altitude, at 8000 MSL, this aircraft encountered light turbulence and the autoplt immediately made an input to counter. The ground spoiler deployed light illuminated and the control wheel was positioned at approximately 50 degrees left wing down and the 'ball' displaced to the left. I disengaged the autoplt and kept the control wheel at 50 degrees left wing down and considerable left rudder. The IAS lost about 25 KIAS and we maintained 125 KIAS and 500 FPM climb. I maintained 125 KIAS and 300-500 FPM to 17000 ft MSL. Upon reaching 17000 MSL, climb power was maintained and cruise speed was approximately 155 KIAS. The aircraft handling was normal except for the 50 degree control wheel input, the strong left rudder trim, and the approximately 30-40 KIAS too low airspeed. I did not engage the autoplt for the remainder of the flight. When given a descent by ZDC, I began to increase airspeed in 10 KIAS increments and the aircraft handled well. At approximately 232 KIAS, the aircraft suddenly jumped to a left wing low, out of trim condition, the ground spoiler light went out and airspeed started to increase more rapidly. The aircraft now flew normally and an uneventful landing was made at bwi. Maintenance later reported that the spoiler bracket broke at 230 KIAS and the spoiler retracted itself. Recommend some method of retracting such spoiler deployment in flight.
Original NASA ASRS Text
Title: THE L WING GND SPOILER ON AN MDT CAME OUT IN TURB. IT BROKE FREE AND RETRACTED WHEN THE ACFT SPED UP IN DSCNT.
Narrative: DURING CLB TO CRUISE ALT, AT 8000 MSL, THIS ACFT ENCOUNTERED LIGHT TURB AND THE AUTOPLT IMMEDIATELY MADE AN INPUT TO COUNTER. THE GND SPOILER DEPLOYED LIGHT ILLUMINATED AND THE CTL WHEEL WAS POSITIONED AT APPROX 50 DEGS L WING DOWN AND THE 'BALL' DISPLACED TO THE L. I DISENGAGED THE AUTOPLT AND KEPT THE CTL WHEEL AT 50 DEGS L WING DOWN AND CONSIDERABLE L RUDDER. THE IAS LOST ABOUT 25 KIAS AND WE MAINTAINED 125 KIAS AND 500 FPM CLB. I MAINTAINED 125 KIAS AND 300-500 FPM TO 17000 FT MSL. UPON REACHING 17000 MSL, CLB PWR WAS MAINTAINED AND CRUISE SPD WAS APPROX 155 KIAS. THE ACFT HANDLING WAS NORMAL EXCEPT FOR THE 50 DEG CTL WHEEL INPUT, THE STRONG L RUDDER TRIM, AND THE APPROX 30-40 KIAS TOO LOW AIRSPD. I DID NOT ENGAGE THE AUTOPLT FOR THE REMAINDER OF THE FLT. WHEN GIVEN A DSCNT BY ZDC, I BEGAN TO INCREASE AIRSPD IN 10 KIAS INCREMENTS AND THE ACFT HANDLED WELL. AT APPROX 232 KIAS, THE ACFT SUDDENLY JUMPED TO A L WING LOW, OUT OF TRIM CONDITION, THE GND SPOILER LIGHT WENT OUT AND AIRSPD STARTED TO INCREASE MORE RAPIDLY. THE ACFT NOW FLEW NORMALLY AND AN UNEVENTFUL LNDG WAS MADE AT BWI. MAINT LATER RPTED THAT THE SPOILER BRACKET BROKE AT 230 KIAS AND THE SPOILER RETRACTED ITSELF. RECOMMEND SOME METHOD OF RETRACTING SUCH SPOILER DEPLOYMENT IN 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.