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INSPECTION FOR CONTROL CABLE INTERFERENCE

Precautionary inspection, L-13 Blanik, all serial numbers. During flight, a control jamming occurred which was cleared by a high force applied to the control column. Subsequent investigation revealed that a rudder cable turnbuckle and elevator control cable turnbuckle were located side by side just behind the fuselage main bulkhead and due to slackness of the control cables which was not unusually excessive, the cables had come together sufficiently for the turnbuckle locking plates to become hooked together. Further investigation of a number of L-13 Blaniks has not shown the location of the control cable turnbuckle to be the same as the subject glider but it is not known if there are other Blaniks which have the control cables turnbuckle located similarly.