MIL-F-9490D(USAF) 3.2.8.3.2.1 Retention of threaded joints. All threaded joints which carry critical loads shall be positively locked in the assembled position so that load reversal at the threads is prevented. The use of jam locknuts alone is not a positive locking means unless lockwired or otherwise restrained.
Installing the rod end bearings for the rudder and elevator, I'm seeing a conflict between Vans plans and the above. For instance, the rudder plans (DWG 7, RV-7,9) note the use of jamnut AN316-6 on the rod end bearing. First, shouldn't I use two jamnuts together? And second, since it is a "threaded joint" which seems to carry a "critical load", is the use of jam locknuts alone sufficient?? And third, in general should jamnuts be torqued, if so, to what value?
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