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The deteriorated condition of the plastic cable guards, and the use of tape to effect a "repair", suggests that the manufacturer's advice regarding replacement of the guards had not been heeded during major maintenance inspections.

It is likely that, when the plastic cable guard failed, a piece or pieces of plastic lodged in the left side cable run aileron control pulley, restricting the cable movement in one direction. The debris probably dislodged when the aircraft was at about 400 ft on final approach.

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