MIL-DTL-45500E
only) recoil spring assembly preload, shall be measured and recorded
at the start of the test, after each 15,000 rounds fired, and at the
end of the test.
4.6.6.4 Parts replacement. No alteration or replacement of
parts except as scheduled shall be made unless the parts are
broken or worn to the extent that they cause malfunctions or
impair or jeopardize the safe operation of the gun. A complete
record shall be kept for each endurance test, showing all gun
maintenance procedures, each malfunction, and all parts replaced,
including the number of the gun rounds at which they occurred.
4.6.6.5 Disposition. Endurance tested guns and parts shall
be disposed of as specified in the contract (see 6.2).
4.6.7
Interchangeability test.
4.6.7.1
Intra-plant.
4.6.7.1.1 Guns. Guns shall be tested by disassembly and
reassembly of parts, using parts from a prearranged system.
Interchangeability of parts shall be accomplished by dividing the
parts of each gun into three groups of non-mating parts, and
distributing the groups into three different trays until each
tray contains parts for a complete gun. Groups of parts with the
same part number are to be exchanged between guns as a set.
Groups I, II and III of non-mating parts shall be as specified on
the applicable specification sheet. Groups of parts from the
first gun shall be taken in order and placed in trays 1 through
3; groups of parts from the second gun shall be taken in order
and placed in trays 2, 3, and 1; groups of parts from the third
gun shall be taken in order and placed in trays 3, 1, and 2.
Common hardware such as screws, spring pins, etc., shall be
placed in the same tray as their mating or associate part. New
laminated shims may be used for reassembly of guns during the
interchangeability test. Any common hardware or other expendable
items, rendered unserviceable by disassembly shall be replaced
without penalty to the interchangeability test. The guns shall
be reassembled using only those parts which are in the same tray.
4.6.7.1.2 Concurrent repair parts. When required by contract
(see 6.2), concurrent repair parts shall be tested for interchange-
ability by disassembling two guns previously tested in 4.6.7.1.1 and
reassembling, using the concurrent repair parts. This test shall be
performed independently of the interchangeability test required in
4.6.7.1.1 using accepted guns taken from current production.
4.6.7.2
Inter-plant.
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