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MIL-M-70821 (AR)
4.7.2 Automatic acceptance inspection.  In addition to the
requirements as specified. In this specification and in the
applicable contract, the requirements of MIL-A-70625 shall apply
to automatic acceptance inspection equipment.
4.7.3 Mechanical gymnastication.  Each mount, including the
cannon or simulated equal shall be gymnasticated on a
Government-approved gymnasticator for a minimum of 40 cycles as
follows:
10 cycles at 0, long recoil (36.0 .2 inches)
a.
10 cycles at 45, long recoil (36.0 2 inches)
b.
0
10 cycles at 45 , short recoil (24.0 .2 inchess)
c.
10 cycles at max. QE, short recoil (24.0 .2 inches).
d.
Smooth counter-recoil performance is required prior to completion
of gymnastication.  Recuperator nitrogen charge pressure shall be
0
set at 700 + 10 psi at 70 F temperature prior to gymnastication.
4.7.3.1 Particle count.  After gymnastication, oil shall be
drained from the assembly for particle count (3.3.1).
4.7.3.2 Hydraulic leakaqe.  During each 10 cycle test the
mount shall be lnspected for evid for evidence of hydraulic leakage (3.4.5).
4.7.3.3 Nitrogen leakage.  During each 10 cycle test, the
mount shall be inspected for evidence of nitrogen leakage (3.4.6).
4.7.4 Functional/proof firing.  Each gun mount shall be
subjected to the followlng firing test:
4.7.4.1 Functional firing.  Each gun mount shall be submitted
to the powder gymnastication or hydraulic artillery simulation
test as specified in Table II with the recuperator nitrogen
pressure set to 700 25 psi at ambient temperature prior to
firing.  All testing shall be done on a test stand at zero
elevation with the variable recoil locked for long recoil or short
recoil as applicable to simulate specified elevations.  The
gymnasticator/simulator shall be varied as required to meet the
stated impluse levels.  All measurements required by 3.4.2 shall
be made for erratic motion in counter-recoil. During and after
firing, each mount shall be examined to determine compliance with
oil leakage requirements specified in 3.4.5 and nitrogen leakage
as specified in 3.4.6.
17

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