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|  MIL-M-70821 (AR)
3 .4.3 Proof firing. Each sample mount shall be subjected to
proof fixing at a Government proving ground as specified in
4.7.4.2 without evidence of malfunction or failure and shall meet
the criteria of 3.4.3.1 through 3.4.3.3. After proof firing, the
gun mount shall meet the requirement of 3.4.5, 3.4.6 and 3.4.7.
3.4.3.1
CTRR.
3.4.3.1.1 CTRR velocity. At 1.0 .1 inch from the complete
in-battery position, the CTRR velocity shall not exceed one and
one-half (1-1/2) feet per second.
0
3.4.3.1.2 CTRR cycle time.
The CTRR cycle time at -50 F tp
0
+145 F in seconds shall be:
CTRR Stroke
Elevation in Degrees
0
30 F and Below
Above 30 F
.650 - 3.500
.650 - 1.900
.850 - 5.900
.850 - 3.900
Maximum
3.4.3.2 Recoil cycle. The recoil cyclye travel (in inches) and
total cycle time (in seconds) shall be as follows:
3.4.3.2.1 Recoil travel in inches.
Recoil Travel
Elevation
0
0
27 - "36
18 - 27
Maximum
3.4.3.2.2 Total cycle time.
Total Cycle Time
Elevation
300 and Below
Above 300 F
.800 - 3.700
0
.800 - 2.100
1.000 - 6.100
1.000 - 4.100
Maximum
NOTE : Conditions of hanging-out-of-battery at the higher
elevations are acceptable on the M182 gun mount provided it
returns to battery upon lowering tube to loading elevations
(approximately 110 roils). The test agency is to record the length
of hanging-out-of-battery' s in reports.
3.4.3.3 Recoil performance zones. For all proof firings,
actual recoil oil pressure versus time curves shall be within
defined recoil performance zones in figures 3 and 4.
9
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