3.4.3 Proof firing. Each sample mount shall be subjected to
proof firing at a Government proving ground as specified in 4.6.3
without evidence of malfunction or failure and shall meet the
criteria of 188.8.131.52 through 184.108.40.206. During and after proof
firing, the gun mount shall meet the requirements of 3.4.5, 3.4.6
220.127.116.11 CTRR velocity. At one inch from the complete
in-battery position, the CTRR velicuty shall not exceed one and
one-half (1 1/2) feet per second.
18.104.22.168.2 CTRR cycle time.
The CTRR cycle time at 400F to
100 F in seconds shall be:
Elevation in Degrees
.650 - 1.250
.850 - 1.850
22.214.171.124 Recoil cycle. The recoil cycle travel (in inches)
and total cycle time (In seconds) shall be as follows:
Recoil travel in inches.
27 - 36
18 - 27
Total cycle time in seconds.
Total Cycle Time
.800 - 1.400
1.000 - 2.000
NOTE : Conditions of having-out-of-battery at the higher
elevations are acceptable on the M178 Gun Mount provided it
returns to battery upon lowering tube to loading elevations
(approximately 110 mils). The test agency is to specify length of
hanging-out-of-battery's in reports.
126.96.36.199 Recoil performance zones. For all full charge firings
actual recoil cyclinder Oil pressure versus time curves shall be
within defined recoil performance zones shown in Figures 3 and 4.