3.1.1 Qualification. Filter units and filter elements furnished under this specification shall be products
which are qualified for listing on the applicable qualified products list at the time set for opening of bids
(see 4.4 and 6.3).
3.1.2 Components. The filter unit shall consist of the following major components:
Differential pressure indicator
3.1.3 Selection of specifications and standards. Specifications and standards for necessary commodities
and services not specified herein shall be selected m accordance with MI L-STD-143.
3.2.1 Protective treatment. Except for filter elements, aluminum alloy parts shall be anodized in
accordance with MIL-A-8625. The use of plating to meet corrosion resistance of metals referred to in
paragraph 3.2.2 is prohibited.
3.2.2 Metals. Metals shall be of the non-ferrous type in order to resist corrosion due to water, hydraulic
fluids, salt spray, or atmospheric conditions likely to be met in storage or normal service.
3.2.2 Dissimilar metals. Unless protected against electrolytic corrosion, dissimilar metals shall not be
used in intimate contact with each other. Dissimilar metals are defined in MIL-STD-33 586.
3.2.4 Recovered materials. For the purpose of this requirement, recovered materials are those materials
which have been collected from solid waste and reprocessed to become a source of raw materials, as
distinguished from virgin raw materials. The components, pieces and parts incorporated in the filter unit
may be newly fabricated from recovered materials to the maximum extent practicable. provided the filter
unit produced meets all other requirements of this specification. Used, rebuilt or remanufactured com-
ponents, pieces and parts shall not be incorporated m the filter unit.
Design and construction. The filter unit shall be designed and constructed so that no parts will
work loose in service. The filter unit shall withstand the stresses, jars, vibrations, and other conditions
incident to shipping, storage, installation, and flight line service.