MIL-P-45651B(MU)
image tilt, and parallelism of reticle and
A visual examination shall be made for
image. The device shall permit mounting the
missing or damaged parts before the peri-
body assembly with datum plane X vertical
scope is subjected to the remaining perform-
ance tests. Minimum visual examination shall
within 10 seconds and reference line Y hori-
zontal within 10 seconds. Corresponding
include boresight locks, elevation input
mating locating surfaces of the device shall
coupling, body assembly, head assembly, and
be in complete contact with the locating
eyepiece assembly. A tactile examination
surfaces (datum plane X and referenced
should also be conducted to determine loose-
line Y) of the body assembly. The device
ness or improper functioning of such moving
shall also be equipped with a 24-volt direct
parts as the input coupling, azimuth and
current power source for energizing the
elevation knobs, boresight knob and lock,
reticle light.
as well as screws, nuts, and other assembled
parts which may have been loosened as a
4.5 Test methods and procedures.
result of vibration. An audible examination
shall be made by holding the periscope close
4.5.1 Environmental.
to the ear and shaking the periscope by hand
4.5.1.1 Storage temperatures. This test
to try to detect loose optical and mechanical
shall be conducted in accordance with the
parts such as lenses, cells, retainers, prisms,
conditions of 3.4.1 and the applicable Test
adapters, or separated bonded elements, Any
Facilities of Specification MIL-F-13926,
one of the possible defects defined above shall
Upon completion of the specified exposure,
be cause to consider the periscope as defec-
tive unless separate defects per-hundred
the periscope shall be inspected for damage
and then subjected to all the tests of this
type sampling plans are established and
specification in accordance with 3.4.1.
approved by the Government as a part of
the supplier's inspection system. Periscopes
4.5.1.2 Operating temperatures. This test
which have passed the above examinations
shall be Conducted in accordance with the
shall be subjected to the tests of 4.5.2.2 to
conditions of 3.4.2 and the applicable Test
4.5.8.14, inclusive, to determine overall con-
Facilities of Specification MIL-F-13926.
formance with 3.4.3.
While exposed to and thermally stabilized
4.5.2.2 Line of sight retention. This test
at the indicated temperatures, the periscope
shall be performed prior to vibration in
shall be subjected to the tests specified in
accordance with 4.5.7.1, and the results
4.5.5.4.5.7.6, 4.5.8.6, and 4.5.8.7. The controls
of the periscope shall meet the torque and
noted. Subsequent to vibration the test shall
again be performed and the line of sight
force requirements for the indicated operat-
shall be within the tolerance as specifiecd
ing temperatures as specified in 3.4.2.
in 3.4.4.
4.5.2 Vibration. Standard vibrating equip-
4.5.3 Cleanliness. The periscope shall be
ment capable of providing the amplitude and
inspected for cleanliness in accordance with
frequeney as specified in 3.4.3 shall be uti-
Specification MIL-O-13830 and shall meet.
lized for this test. The periscope shall be
vibrated in a vertical plane. Unless otherwise
the requirements specified. The mean diam-
specified the test equipnent shall be in
eter of a size 19 dig is equal to 0.10 Milli-
meter.
conformance with the Test Facilities require-
ments of Specification MIL-F-13926.
4.5.4 Parallax. Position the periscope. in
its normal operating position. in a holding
4.5.2.1. Post vibration. Subsequent to vibra-
tion the
device. Adjust the boresight knobs of the
ined for physical defects resulting from poor
body assemb]y to their mid-point of travel, as
workmanship and materials to determine
indicated in 3.9.2 and 3.9.3, and the parallax
compliance with 3.4.3 prior to being sub-
adjustment screw as specified. Direct a line
of sight through the periscope boresight
jected to the remaining tests specified herein.
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