MIL-PRF-49157B
3.5.3 Vibration. The objective lens assembly shall not be damaged (see
3.9.1) by vibrations in the frequency range of 10 hertz (Hz) to 55 Hz with a
double amplitude of 0.050 inch ± 0.005.
3.5.4 Immersion. The objective lens assembly shall not be damaged (see
3.9.1) after being immersed in fresh water to a depth of not less than 3 feet for
a period of not less than 30 minutes. The objective lens assembly shall be pre-
conditioned by exposure to a temperature of 45oC ± 3 C° for a period of 2 hours
prior to being immersed in the fresh water at a temperature of 18oC ± 5 C°.
3.6 Treatment and painting. Treatment and painting shall be anti-
reflective, shall be rust resistant and as specified on the applicable drawings
unless otherwise specified in the contract or purchase order.
3.7 Marking. Marking shall be in accordance with the drawing unless
otherwise specified in the contract or purchase order.
3.8 Workmanship. Workmanship standards shall be such that the objective
lens assembly will meet all requirements of this specification and any referenced
specifications or drawings.
3.9 Technical interpretations. The following technical interpretations
are, when referenced in sections 3, mandatory for this specification.
3.9.1 Damage. Damage is defined as: condensation, fogging, or moisture
on any internal surface; failure of any finish; dents, breakage, or failure of
any hardware, connection, interface, or component.
3.9.2 Ambient (room) temperature.
Ambient (room) temperature is defined
as 23 C ± 10 Co.
o
3.9.3 g. g is defined as the magnitude of the earth's mean surface
gravitational acceleration with a value of 32.2 feet per second per second.
3.9.4 Optical cell. The optical cell is defined as the cylindrical part
of the cell assembly which is in direct contact with the lens elements and
spacers, holds the lens elements and spacers in their fixed relative positions,
and has no external pins, sleeves, flanges, retainers, or other surfaces or
fittings attached to it in any manner.
3.9.5 Environmental temperature.
Environmental chamber temperature shall be
controlled to within ±5C°.
4.
VERIFICATION
4.1
Classification of inspections.
Inspections shall be classified as
follows:
a.
First article test inspection (see 4.2).
b. Conformance inspection (see 4.3).
4.2 First article test inspection. When specified in the contract or
purchase order (see 6.2.c), first article test (FAT) inspection shall be
performed by the contractor. The quantity of FAT inspection samples shall be as
specified in the contract or purchase order (see 6.2.d) and shall be selected
from the first production lot.
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