MIL-DTL-62420B(AT)
3.4.3 Chemicals. The assembly shall meet the performance requirements of 3.4.1 after
exposure to vapors of and in direct contact with the following materials for 48 hours minimum:
a. Diesel fuel grade 1 and 2, aviation turbine fuels grade JP-4 or JP-5 and regular
automotive leaded gasoline. Hydraulic fluid per MIL-PRF-6083, or equivalent
and MIL-H-46170, or equivalent.
3.5 Interface requirements. The assembly shall conform to the interface envelope
dimensions, mounting and electrical interfaces in the applicable drawing (see 4.8).
3.6 Support and ownership requirements. Each control unit shall possess the following
life cycle ownership characteristics.
3.6.1 Bubbles and inclusions. Bubbles and inclusions (excepting lint) in the clear
aperature shall not exceed 0.040 inch (in.) (1 millimeter (mm)) in maximum diameter and the total
projected areas (perpendicular to the light path) of all bubbles and inclusions shall not exceed
0.50% of the cross-sectional area of the bonded body perpendicular to the light path. Maximum
permissible inclusions are listed in table I (excepting lint):
TABLE I. Maximum Permissible Inclusions.
Diameter in inches (mm)
Periscope
0.040 0.030
0.020
0.010
0.005
(1)
(0.8)
(0.5)
(0.3)
(0.1)
M1 driver (all)
3
10
12
48
92
M1 commander (all)
3
10
12
48
92
15° uplook
3
10
12
48
92
20° uplook
3
10
12
48
92
12357918
3
10
12
48
92
12357792, 12357794
5
10
21
81
332
12357850, 12370033
12370322, 12370393
More than the maximum combination of bubbles and inclusions shall not be permitted although a
lesser number than permissible is found in one area.
3.6.2 Lint. No lint particles in the clear aperature shall exceed 0.25 in. (6.4 mm) in
projected length (perpendicular to the light path). Not more than one such lint particle shall be
permitted. No additional lint particles shall exceed 0.125 in. (3.2 mm) in projected length. The
cross-sectional area of all lint particles shall be computed on the basis of 0.003 in. (0.08 mm)
width and shall be included in the computation of total projected area. The total projected length
(in.) of all lint particles shall not exceed the following:
7
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