MIL-DTL-62420B(AT)
4.7.3 Chemicals. The assembly shall be exposed to the vapors of and direct contact with
the chemicals specified in 3.4.3 for a period of 48 hours minimum. The periscope to be tested
shall be placed on an open rack suspended in a sealed container. Prior to closure of the container
each chemical shall be successively sprayed onto all exterior surfaces in sufficient volume to begin
run off. The container will be sealed for 48 hours minimum. After exposure the assembly shall be
subjected to and pass the performance tests of 3.4.1.
4.8 Interface requirements verification. Verify the envelope dimensions and mounting
interface by measurement and placement, and the electrical interface by connection and
disconnection of cables and connectors, in the existing location on different types of fully tracked
combat vehicles.
4.9 Support and ownership requirements verification.
4.9.1 Bubbles and inclusions. Periscopes shall be inspected for bubbles and inclusions
under brilliant illumination such as outlined in 4.7.1. The distribution and size of bubbles and
inclusions shall conform to 3.6.1.
4.9.2 Lint. The test for lint shall be performed on the periscopes at the same time that the
test for bubbles and inclusions of 4.9.1 is being performed. The length of the lint particles shall
conform to the requirements of 3.6.2. The total projected area of any lint particles shall be
computed as stated in 3.6.2 and shall be added to the total area found in 4.9.1. The periscopes
shall then be subjected to and pass the test of 4.7.1.
4.9.3 Cleanliness. Each optical system exit and entrance window exterior surface shall be
examined with the unaided eye.
4.9.4 Identification and marking. Verify the presence of the required markings on the
assembly. After performing all environmental tests in 4.10, re-inspect the assembly markings for
readability.
4.9.5 Safety Inspection. Inspect periscopes for hazardous burrs, nicks, sharp edges,
foreign materials, or other imperfections that pose physical danger to an installer/operator.
4.10 Operating environmental requirement verification. Unless otherwise specified
herein, the applicable test methods and procedures of MIL-STD-810, or equivalent shall apply
(see 3.7). Note that the optical performance tests of 3.4.1 shall be performed after completing the
required series of environmental tests. Conducting optical performance tests between
environmental tests is optional.
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