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|  MIL-F-45557B
4.6.2 Endurance test.
4.6.2.1 Feeders shall be tested for endurance requirement using
slave M61 and M61A1 guns or contractor designed Government approved
test equipment which simulates the function of the gun.
4.6.2.2 Linked ammunition in belts of 100 rounds each shallbe
used. The feeders shall be accelerated up to a feeding steady state
rate of 4,000 to 4,400 rounds per minute before the feeder is declutched
approximately in the middle of each belt. The feeder shall not be de-
clutched at fire-out (without ammunition in feeder). The feeder solenoid
shall be energized to declutch the feeder at the instant power to the
drive is removed, and shall be deenergized after the gun comes to a com-
plete stop. The feeder solenoid shall not be energized for more than
15 seconds at any one the. Feeders shall be checked after each 1,500
rounds for correct timing and loosening of parts. All loosened parts
shall be retightened and recorded. In addition, the feeders shall be
cleaned and lubricated after each 1,500 rounds and at the end of each
day's testing. The bearings and electrical parts shall be protected
from contamination by cleaning materials. Instrumentation shall be in
accordance with 4.6.1. Data shall be taken and recorded from one belt
in each 1,500 round series for use in computing required data.
4.6.2.3 Endurance tested feeders shall be disposed of as specified
in procurement documents (see 6.1).
4.6.3 Interchange of parts.
4.6.3.1 In plant.
4.6.3.1.1 Feeders. Feeders shall be tested for interchange of
parts by disassembling and then reassembling parts using the parts and
prearranged system specified below. Interchange of parts shall be
accomplished by dividing the parts of each feeder into three groups of
nonmating parts as shown below and distributing the groups into three
different trays until each tray contains parts for a complete feeder.
Groups of parts from the first feeder shall be taken in order and placed
in trays one through three; groups of parts from the second feeder shall
be taken in order and placed in two, three and one; groups of parts
from the third feeder shall be taken in order and placed in trays three,
one, and two. Commercial parts such as screws, spring pins, etc., shall
be placed in the same tray as their mating or associate part. Any
commercial part rendered unserviceable by disassembly shall be replaced
without penalty to the interchangeability test. The feeders using only
those parts which are in the same tray.
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