scope:

Description of Driving Event:

In the time period of 1960-1975, a generic problem was encountered on several Scout Vehicle components containing elastomer O-Rings. During the Scout Production Procurement, components such as regulators and hydraulic actuators were a source of problems due to leakage after initial acceptance tests. An extensive investigation and long surveillance period determined the cause of the leakages to be the O-Ring set.

The type of set used was not the well-known permanent set of an elastomer, but rather a much shorter time duration. This was to allow the elastomer to seat in its permanent position in the groove, allow distribution of lubricant, etc. Corrective action was to allow a time period after component assembly and acceptance testing.

Further information can also be obtained by contacting the Reliability and Quality Division of Loral Vought Systems at P.O. Box 650003, Dallas, TX, 75265-0003 or calling (214) 603-1000.