MIL-DTL-46992E (OS)
4.4.6 Spring load. The spring shall be assembled in the test equipment and force applied until the spring
is compressed to the larger height specified in Drawing 8875988. The applied force shall be recorded.
Force shall be reapplied until the unit is compressed to the smaller height specified in Drawing 8875988
and the applied force recorded. Any spring exhibiting a compression force at either height outside the
load range permitted by Drawing 8875988 shall be classified defective.
4.4.7 Spring embrittlement. The spring shall be held at each end and stretched until the minimum point
of permanent distortion is reached. If the spring breaks before reaching that point, it shall be classified
defective. Springs so tested shall be discarded.
4.4.8 Corrosion resistance. Corrosion resistance testing shall be performed as specified in MIL-STD-
810.
4.4.9 Airtightness. Each knife delay assembly shall be tested in a helium gas leak tester.
4.4.10 Lanyard assembly pull test. The lanyard assembly shall be placed in the applicable test
equipment wherein it shall be held at the firing pin release and through the lanyard eye. The specified
load shall be applied. No dwell time is required. Any unit which separates shall be classified as
defective.
4.4.11 Radiographic examination. Each assembled cutter shall be radiographically examined in
accordance with ASTM E1742 with the exception that a fully assembled cutter shall be substituted for the
penetrameter. The cutters shall be positioned for the most revealing exposure with the long axis of the
cutter perpendicular to the rays of the x-ray machine. All assemblies shall be examined by radiographic
plates and any observable imperfections in components or assembly shall be cause for cutter rejection.
All assemblies shall be identified with serial numbers prior to examination. The cutter serial numbers
shall be in consecutive numerical order beginning with the number 001 in each production lot. The
assemblies for radiographic examination shall be arranged on trays or boards in numerical order and each
radiograph shall carry a permanent identification of the assemblies displayed thereon. Any missing serial
numbers are to be identified on the x-ray. The radiographic plate identification shall include the complete
lot number, as stamped on the cutters, and the span of serial numbers displayed. Radiographic plates of
the entire production lot shall be forwarded to the activity conducting the ballistic acceptance testing (see
6.3). Film interpretation of the radiographic plates shall verify that the final assembly is properly
assembled and includes all components. Defective assemblies found during x-ray review are to be
marked on the x-ray prior to shipment and those defective items shall be removed from the production lot.
4.4.12 Staking. The assembled cutter shall be placed in a holding device in which the prescribed amount
of torque can be applied to the retainer to verify that the staking between case and retainer meets the
requirements of 3.11.
4.4.13 Vibration. The selected sample shall undergo transportation vibration testing as specified by
procedure II in Test 401 of MIL-STD-331. All units shall be tested at ambient temperature (70° ± 5 °F)
only.
4.4.14 Withdrawal and non-withdrawal of cotter pin. The assembled cutter shall be firmly mounted
in a holding fixture. A force equal to the minimum specified withdrawal force shall be applied, without
impact, to the cotter pin so as to tend to remove the pin from the assembly. The force shall act in a
direction parallel to the length of the pin and shall be applied at the eye. If the safety cotter pin is not
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