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oo. Open the small aperture of the AN/VPS-2B lens cover.
PP.  View through the AN/VPS-2B night sight and adjust the
azimuth and elevation boresight adjusting screws of the
AN/VPS-2B until the distant aiming point is centered on
the top center dot of the AN/VPS-2B sight reticle.
qq.  Cage the M61 sight.
rr. Set the SYSTEM POWER switch to the OFF position.
ss. On the drum drive assembly, pull out the shift pin handle
and place the drum drive in the fire position (shift to
F position).
tt.  Recheck that there is nothing in the muzzle.
4.6.29 Hand brake test. The weapon system shall be subjected to the
hand brake test to determine compliance with 3.3.27, unless documentary
evidence is supplied as proof that the brakes were tested during production
by an equivalent static torque test with the brake assembly mounted to the
running gearo
4.6.30 Towing and fording test. The weapon system shall be towed
over terrain and road conditions at speeds specified in 3.3.28 using an
M561, M705 or M715 2 1/2 ton truck and coupler adapter (8438335) installed
on the carriage. The weapon system shall be tested under the conditions
of, and shall comply with the requirements for fording of 3.3.29.
4.6.31 Environmental test. The weapon system shall be tested as
specified in through to determine compliance with
3.4.1 through 3.4.9. Where advantageous, naturally occurring environ-
ments may be used in lieu of laboratory produced conditions. There
shall be no evidence of corrosion, degradation of performance, or damage
that would prevent the weapon system from performing its intended function. Altitude test.  The weapon system shall be tested to
determine air transportability to 40,000 feet and operability to 10,000
feet in accordance with Procedure I, Method 500 of MIL-STD-810. Temperature tests. High temperature test. The weapon system shall be
tested when stabilized at 1250 after four hours in a storage temperature
at 155 in accordance with Procedure 1, Method 501 of MIL-STD-810. The
weapon system shall be tested for operation at 120F in accordance with
Procedure II, Method 501 of MIL-STD-810. Low temperature test.  The weapon system Shall be tested
for a low temperature storage condition of -40F for 12 hours without
solar radiation in accordance with Procedure I, Method 502 of MIL-STD-
810. At 0, -20 and -40F, the degradation in performance shall be not
more than 5, 10 and 15 percent, respectively.

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