Safety of Flight CH-47-04-01 |
Swashplate Bearing |
Summary of Problem: Safety of Flight message, CH-47-03-01, established inspection requirements for the H-47 Forward and Aft Swashplate Assemblies. These inspection requirements included submitting a grease sample for analysis by the Army Oil Analysis Program (AOAP). Inconsistent results from this program do not show correlation between grease sample results and actual swashplate assembly damage/condition. The AOAP grease sampling results can not be considered a reliable method to indicate pending bearing failure or even used to assess the condition of the swashplate bearings. See also 91-00233. |
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