Narrative:

Due to a flap selection handle malfunction, my flaps traveled from 10 degrees (takeoff) to 35 degrees (landing) sometime during the takeoff roll. There is no annunciator for this occurrence. Due to situational considerations, I continued the flight to stl (no passenger, day, VFR). The switch was replaced and the problem corrected. 2 days prior to this, the aircraft sustained significant damage due to a lightning strike under another captain's command. Callback conversation with reporter revealed the following information: the reporter stated the flap indicator was checked at start of takeoff roll and was at 10 degrees and the flaps were visually checked at 10 degrees. The reporter said that during the takeoff roll and at or near rotation, the trailing edge flaps extended to the 35 degree position uncommanded. The reporter said on climbing out, it appeared a strong headwind was encountered and the aircraft performance was poor. The reporter stated the flap handle was moved to the full retract position from the indicated 10 degrees and it was discovered the flaps now at 35 degrees would not retract. The reporter said there is no checklist for this malfunction. The reporter said the flap handle was moved to full retract several times with no flap movement and circuit breaker reset to help. The reporter said the alternate flap operation is a hand pump but used only to extend the flaps. The reporter stated this aircraft does not have a takeoff confign warning system. The reporter said it was his decision to continue to stl at flaps 35 degree speed. The reporter stated maintenance found the flap selector handle switch failed closed.

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Original NASA ASRS Text

Title: A JETSTREAM 3201 ON TKOF ROLL HAD TRAILING EDGE FLAPS MOVE FROM 10 DEGS TKOF POS TO 35 DEGS DUE TO A FAILED FLAP HANDLE SWITCH.

Narrative: DUE TO A FLAP SELECTION HANDLE MALFUNCTION, MY FLAPS TRAVELED FROM 10 DEGS (TKOF) TO 35 DEGS (LNDG) SOMETIME DURING THE TKOF ROLL. THERE IS NO ANNUNCIATOR FOR THIS OCCURRENCE. DUE TO SITUATIONAL CONSIDERATIONS, I CONTINUED THE FLT TO STL (NO PAX, DAY, VFR). THE SWITCH WAS REPLACED AND THE PROB CORRECTED. 2 DAYS PRIOR TO THIS, THE ACFT SUSTAINED SIGNIFICANT DAMAGE DUE TO A LIGHTNING STRIKE UNDER ANOTHER CAPT'S COMMAND. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE FLAP INDICATOR WAS CHKED AT START OF TKOF ROLL AND WAS AT 10 DEGS AND THE FLAPS WERE VISUALLY CHKED AT 10 DEGS. THE RPTR SAID THAT DURING THE TKOF ROLL AND AT OR NEAR ROTATION, THE TRAILING EDGE FLAPS EXTENDED TO THE 35 DEG POS UNCOMMANDED. THE RPTR SAID ON CLBING OUT, IT APPEARED A STRONG HEADWIND WAS ENCOUNTERED AND THE ACFT PERFORMANCE WAS POOR. THE RPTR STATED THE FLAP HANDLE WAS MOVED TO THE FULL RETRACT POS FROM THE INDICATED 10 DEGS AND IT WAS DISCOVERED THE FLAPS NOW AT 35 DEGS WOULD NOT RETRACT. THE RPTR SAID THERE IS NO CHKLIST FOR THIS MALFUNCTION. THE RPTR SAID THE FLAP HANDLE WAS MOVED TO FULL RETRACT SEVERAL TIMES WITH NO FLAP MOVEMENT AND CIRCUIT BREAKER RESET TO HELP. THE RPTR SAID THE ALTERNATE FLAP OP IS A HAND PUMP BUT USED ONLY TO EXTEND THE FLAPS. THE RPTR STATED THIS ACFT DOES NOT HAVE A TKOF CONFIGN WARNING SYS. THE RPTR SAID IT WAS HIS DECISION TO CONTINUE TO STL AT FLAPS 35 DEG SPD. THE RPTR STATED MAINT FOUND THE FLAP SELECTOR HANDLE SWITCH FAILED CLOSED.

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.