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|  MIL-P-48571(MU)
Following the shock test the periscope shall meet the requirements of 3.8.3.2,
3.8.4.1, 3.8.9, 3.8.2, 3.8.3.1.1, 3.8.3.1.2, 3.8.5, 3.8.6, 3.8.6.1, 3.8.7,
3.8.8, 3.2, 3.1, 3.7, and then each module (see 3.1) shall meet their own
respective post-shock test requirements.
3.7 Cleanliness.- With the periscope disassembled, the three modular
units shall meet the following requirements:
a. Defects.- There shall be no evidence of moisture, grease, finger-
prints, condensates, fractures, and adhesive separations on any glass com-
ponent when viewing through either end of each module (Including the unity
power system).
b. Dirt.
(1) Body assembly (Daylight).- When viewed through the eyepiece,
there shall be no more than three dirt particles appearing within a 50 mil
diameter central field of view. There shall be no more than three dirt par-
ticles appearing outside the specified field of view. The angular separa-
tion between dirt particles shall be at least 15 mils. Dirt particles
smaller than 1/4 reticle line width shall be ignored regardless of distri-
bution. The size of any particle shall not exceed the apparent width of
the reticle line.
(2) Elbow assembly (Passive).- When viewing through the eye-
piece with the image intensifier tube energized, there shall be M more
than five particles visible on the screen surface. The size of any parti-
cle shall not exceed the apparent width of the reticle line.
(3) Head assembly.- There shall be no more than three parti-
cles of dirt or foreign material (classed as dirt) on any glass component.
The size of any dirt particle shall not exceed 0.05 inch.
3.8 Performance.
3.8.1 Orientation.
a. Datum Plane "W" (Ref. Dwg. F11747303) defined by the three mount-
ing pads in a vertical plane. Datum Plane "J" (Ref. Dwg. F11727486) on a
horizontal plane.
b. Side "L" (Ref. Dwg. F11727486) of the input coupling positioned
22 degrees 30 minutes with respect to Datum Plane "W" as measured in a
vertical plane.
At no time shall the input coupling be allowed to strike hard
NOTE:
against the travel stops.
c. The requirements of 3.8.3.1 to 3.8.3.2 inclusive, shall be met
with:
(1) The eyepiece of the daylight system focused on the reticle.
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