MIL-DTL-62337C(AT)
4.8.2.3.1 Preparation of the absolute filter. An absolute filter conforming to ASTM
C800 shall be placed in an air oven and dried for 6 hours at a temperature of 200F to 240F
(93C to 116C) prior to insertion in the test setup. This drying time may be reduced and the
absolute filter considered as completely dry, if there is no change in weight of the absolute filter
over two consecutive 10 minute intervals.
4.8.2.4 Post service airflow restriction. To determine conformance to 3.4.4, after the
dust capacity test of 4.8.2.2, the filter element shall be removed and cleaned of dust by using
clean, dry, compressed air with 100 +10 lb/in2 (690 +69 kPa) line pressure, and a nozzle inside
diameter of not less than 0.13 in. (3.18 mm). The air nozzle shall be inserted into each pocket or
serration of the filter element using a back and forth motion along the length of each serration
and a direct flow into each pocket from inside out. After the filter element is thoroughly air
cleaned, it shall be reassembled in the assembly. The assembly shall be subjected to and pass a
dust free flow of 900 ft3/min (425 L/s) of air through the filter element. The restriction to flow
shall be measured.
4.8.2.5 Air leakage resistance. To determine conformance to 3.4.5, the assembly shall be
sealed at all inlets and outlets and subjected to a vacuum of 30 +0.5 in. of water (7.5 +0.12 kPa).
The vacuum decay (leakage) shall be monitored for 3 minutes. The humidity condition of 3.4
shall not apply.
4.8.3 Interface requirements verification. To determine conformance to 3.5, the
assembly shall be inspected for interface and mounting using one or more of the methods
outlined in 4.7.
4.8.4 Support and ownership requirements verification.
4.8.4.1 Identification marking. To determine conformance to 3.6.1, verify the presence
of the required markings on the air cleaner assembly. After performing all environmental tests in
4.8.5, re-inspect the assemblies markings for presence and readability.
4.8.4.2 Painting. To determine conformance to 3.6.2, the exterior color shall be
examined using one or more of the methods outlined in 4.7 to verify that it is in accordance with
color chip 24087 of FED-STD-595.
4.8.4.3 Serviceability. To determine conformance to 3.6.3, the assembly shall be
inspected for serviceability using one or more of the methods outlined in 4.7.
4.8.4.4 Interchangeability. To determine conformance to 3.6.4, the interchangeability
between different parts, subassemblies, and assemblies having the same military part number
shall be verified using one or more of the methods of 4.7.
4.8.4.5 Safety. To determine conformance to 3.6.5, the assembly shall be inspected to
assure that the components are free of hazardous burrs, nicks, sharp edges, foreign materials, or
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