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|  MIL-M-63333(AR)
3. 3.1 Storage temperatures. The mount shall show no evidence of physical
failure such as casting failure, adhesive failure, or deterioration of Gasket
10513302 due to storage at temperatures ranging from -80 to +160
Fahrenheit (F). Subsequent to meeting this requirement, the mount shall be
capable of meeting the requirements of 3.8.1.
3.3.2 Extreme operating temperatures. The mount shall meet the
applicable requirements of 3.8.1 while exposed to and thermally stabilized at
0
-65 and +150F.
temperatures of
3.3.3 Standard temperature. unless otherwise specified herein, the mount
shall meet the following requirements while exposed to a temperature between
+60 and +90F.
3.4 Orientation. The requirements of 3.6, 3.7 and 3.8
shall be met with
Datum Plane "A" in a horizontal plane within 2.0 degrees of
arc and the shield
assembly and Mount Assembly 11834835 positioned as shown on
Drawing
F11834833. Unless otherwise specified, the shield shall be
in the raised
position.
3.5 Vibration. The mount shall show no evidence of physical failure due
to being vibrated successively along 3 mutually perpendicular axes. Vibration
shall be a simple harmonic motion, the frequency varying either linearly or
logarithmically from 5 to 55 to 5 cycles per second in 5 minute cycles for a
total of 15 minutes along each of the axes. The amplitude of vibration shall
be maintained constant at 1/64 inch (1/32 inch total excursion). Following
the vibration test, the mount shall meet the requirements of 3.7.3, and shall
then meet all of the following requirements.
3.6 Sealing. The mount shall be capable of meeting this requirement
while exposed to prolonged rainfall with the shield in the raised position.
Gasket 10513302 shall be capable of preventing water penetration below the
contact surfaces when the periscope head assembly is positioned in the mount.
3.7 Periscope holding features.
3.7.1 Insertion and removal. The mount shall permit insertion and
removal of the head assembly and body assembly of the periscope without
restriction.
3.7.2 Periscope mounting repeatability. An original line of sight,
through the periscope body assembly, shall not deviate more than 0.10 mil due
to repeated mounting of the body assembly to the mount.
3.7.3 Rigidity (line of sight retention). The mount shall be capable of
maintaining a previously established line of sight, through the periscope body
assembly, within 0.10 mil subsequent to vibration (see 3.5).
3
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