MIL-DTL-62478C(AT)
3.3.7 Visual anomalies. The optical coupler shall contribute no visually perceptible
defects to the integrated system such as flare ghost image or effects outside the ITA exit pupil
(see 4.6.7).
3.3.8 Leak resistance. The helium leak rate for the optical coupler assembly, when
mounted to the ITA, or a fixture simulating the ITA, shall be no greater than
0.0000152 atmosphere-cubic inch (in3) (0.000025 atmosphere-cubic centimeter (cm3)) per
second when tested with an internal atmosphere which is 10 ±1 percent (%) helium with an ITA
(or fixture) internal pressure of 1 atmosphere (atm) (101.325 kPa) and an external pressure which
is no greater than 1/1500 atm (67.55 Pascals (Pa)) (see 4.6.8).
3.4 Interface requirements. Each optical coupler shall accommodate the following inputs
and interfaces.
3.4.1 Configuration. The external configuration of the optical coupler shall not exceed
the external configuration shown on Drawing 12310400 without obtaining approval from the
contracting authority (see 4.7.1).
3.4.2 Weight. The weight of the optical coupler shall not exceed 9.75 pounds (lb)
(4.43 kilograms (kg)) (see 4.7.2).
3.5 Support and ownership requirements. Each optical coupler shall meet the following
logistical requirements and possess the following life cycle characteristics.
3.5.1 Paint. All exterior painted surfaces shall be painted with chemical agent resistant
aliphatic polyurethane coating conforming to MIL-DTL-53039 or MIL-DTL-64159, color green
383, #34094 of FED-STD-595. All aluminum surfaces shall be cleaned and treated per
MIL-DTL-554, Type II, and primed per MIL-PRF-23377, Type I (see 4.8.1).
3.5.2 Identification marking. Identification marking shall be permanent and legible and
as a minimum, shall include the marking identification code (cage), the contract number, and
National Stock Number (NSN). The nameplate shall be permanently attached, in the proper
location, and include the following information (see 4.8.2):
a.
Optical coupler
Manufacturer s identification
b.
Manufacturer s serial number
c.
d.
Military part number
e.
National stock number (NSN)
Manufacturer s part number
f.
g.
Date of manufacture
h.
Contract number
i.
U.S.
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