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Gfa ad 192

FAILURE OF SPLIT PIN IN LOWER RUDDER MOUNT

Reports have been received of the split pin securing the lower rudder hinge of the subject glider type failing in service as a result of shearing. It appears that bouncing the tail end of the fuselage during take-off and landing and ground movements has led to progressive shearing of the split pin under vertical loading. Later models of this glider have a nut securing the lower hinge in place with a split pin, but it is not known what serial number the change was made. If the lower hinge is fitted with a split pin to secure the rudder in place, the split pin is to be replaced with a modified hinge pin having a slotted nut and split pin to secure the rudder in place.