What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23)During takeoff, pilot attempted to move the collective up but it would not move. A second try was made, but the collective would not move. Mechanics fund the lower rod end of the collective servo screwed out. The threaded end of the rod end contains a grove that the locing washer tang fits into and mates up against the servo lower piston and secured with the jam nut and locking wire. It was found that the locking washer tang had been sheared off allowing the rod end to became unscrewed from the lower piston as it rotated inside of the servo housing. The piston then extended amd lodged itself against the threaded end of the free rod end freezing the servo. Block 32, "other", will be addressed with a safety recommendation.
As the FAA filed it
(-23)DURING TAKEOFF, PILOT ATTEMPTED TO MOVE THE COLLECTIVE UP BUT IT WOULD NOT MOVE. A SECOND TRY WAS MADE, BUT THE COLLECTIVE WOULD NOT MOVE. MECHANICS FUND THE LOWER ROD END OF THE COLLECTIVE SERVO SCREWED OUT. THE THREADED END OF THE ROD END CONTAINS A GROVE THAT THE LOCING WASHER TANG FITS INTO AND MATES UP AGAINST THE SERVO LOWER PISTON AND SECURED WITH THE JAM NUT AND LOCKING WIRE. IT WAS FOUND THAT THE LOCKING WASHER TANG HAD BEEN SHEARED OFF ALLOWING THE ROD END TO BECAME UNSCREWED FROM THE LOWER PISTON AS IT ROTATED INSIDE OF THE SERVO HOUSING. THE PISTON THEN EXTENDED AMD LODGED ITSELF AGAINST THE THREADED END OF THE FREE ROD END FREEZING THE SERVO. BLOCK 32, "OTHER", WILL BE ADDRESSED WITH A SAFETY RECOMMENDATION.
Other reports on N5736J · 2
Matched to the same aircraft by N-number and date.