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Printed page 16. PDF page 29.
Figure 13. The jackscrew ball-nut was found in a horizontal stabilizer trim position of 2.5 units, equivalent to 0.5 degree horizontal stabilizer 16Open official document at PDF page 29Aircraft Accident Report: SilkAir Flight MI 185, Boeing B737-300, 9V-TRF
Printed page 32. PDF page 45.
jackscrew was found in a position equivalent to a horizontal stabilizer trim position of 2.5 units. It was also observed that the ball nut could not be moved freely due to impact deformation. The upper end counter-bore (aft portion) wasOpen official document at PDF page 45Aircraft Accident Report: SilkAir Flight MI 185, Boeing B737-300, 9V-TRF
Printed page 33. PDF page 46.
jackscrew was found in a position equivalent to a horizontal stabilizer trim position of 2.5 units. The difference in the trim positions indicated a change of about 2.0 units (degrees) of the horizontal stabilizer position. The horizontal stabilizer trim normallyOpen official document at PDF page 46Aircraft Accident Report: SilkAir Flight MI 185, Boeing B737-300, 9V-TRF
Printed page 34. PDF page 47.
trim switches forward continuously would move the horizontal stabilizer to a limit of 2.5 units when the flaps are retracted. The horizontal stabilizer trim position was found in a 2.5 units position during the tear down examination. This matches theOpen official document at PDF page 47Aircraft Accident Report: SilkAir Flight MI 185, Boeing B737-300, 9V-TRF
Printed page 38. PDF page 51.
other possibilities, a combination of changing the stabilizer trim from about 4.5 to 2.5 units and an aileron input could result in a descent time history similar to 38Open official document at PDF page 51Aircraft Accident Report: SilkAir Flight MI 185, Boeing B737-300, 9V-TRF
Printed page 45. PDF page 58.
contributing to the accident. � The horizontal stabilizer trim was found to be in the 2.5 units position which matched the forward limit of the manual electrical trim. Flight Operations � Weather and Air Traffic Control were not factors contributingOpen official document at PDF page 58Aircraft Accident Report: SilkAir Flight MI 185, Boeing B737-300, 9V-TRF