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|  MIL-F-45556A
4.6.2.1 Feeders shall be tested for endurance requirement using
slave M61 or M61A1 guns or Government approved test equipment of the
contractor's design (see 4.5.6.2) which simulates the function of the
gun.
4.6.2.2 Linked ammunition in belts of 100 rounds shall be used
and a steady state torque load of 55 30 pound-inches shall be app-
lied to the booster take-off assembly drive point during functioning.
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
declutched at fire-out (without ammunition in feeder). The feeder
solenoid shall be energized to declutch the feeder at the instant
power to drve is removed, and shall be de-energized after the gun
comes to a complete stop. The feeder solenoid shall be checked
after each 1,500 rounds for correct timiming 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. 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 pre-
arranged system specified below. Interchange of parts shall be accom-
plished by dividing the parts of each feeder into three groups of non-
mating parts as shown below and distriubting 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 thorugh three; groups of parts from the se-
cond feeder shall be taken in order and placed in trays 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 rend-
ered unservicable by disassembly shall be replaced without penalty
to the interchangeability test. The feeders shall be reassembled us-
ing only those parts which are in the same tray.
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