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|  MIL-F-27656C(USAF)
d. Operating temperatures from -65 to +160F
3.4.1 Vibration The filter unit shall be capable of withstanding the vibration specified in paragraph
4.6.6.5.1.
3.5
Details of components
3.5.1 Housing. The housing shall be designed so that flow through the element will be from the
outside to the inside. The flow entering the housing shall not impinge directly upon the element
filter media.
3.5.1.1 Housing design. The design of the housing shall permit change of the element without removal
of the inlet or outlet line
3.5.1.2 Pressure indicator. Provisions shall be incorporated in the housing for the differential pressure
indicator specified in paragraph 3.5.3.
3.5.1.3 Dimensions. The inside dimensions and the relet and outlet threads of the housing shall be
shown on figures 1 and 2.
3.5.1.4 Mounting.
3.5.1.4.1 Mounting-Type I. Provisions shall be incorporated on the housing, or a corrosion resistant
adapter shall be provided, to permit its being mounted on a flat vertical surface with four
inch
diameter holes located in a rectangular position with hole centers spaced 4 1/2 164 x 10 1/64
inch. The long axis of the rectangular shall parallel to the axis of the filter elements. The top pair of
holes shall be 3 3/8 3/16 inch below the port-to-port centerline. The port-to-port centerline
shall be parallel to the flat vertical mounting surface. in this position, with the port's end of the
filter upward, the outlet port shall be on the right side. The distance from the port-to-port centerline
to the verticle mounting surface shall be 3 1/2 1/8 inch.
3.5.1.4.2 Mounting-Type II. Provisions shall be incorporated in the housing, or a corrosion-resistant
adaptor shall be provided, to permit its being mounted on a flat vertical surface with four 11/32 inch
diameter holes located in a rectangular position with hole centers spaced 6 1/2 1/64 x 6 1/2 1/64
inch. The top pair of holes shall be 1/2 1/8 inch above the port-to-port centerline. The port-to-port
centerline shall be parallel to the flat vertical mounting surface, in this position, with the port's end of
the falter upward, the outlet port shall be on the right side. The distance from the port-to-port center-
line to the vertical mounting surface shall be 3 1/2 1/8 inch.
3.5.1.5 Wrench pad and drain port. The bottom of the housing shall have a 2 1/4 inch minimum wrench
pad, and shall incorporate an MS33649-4 dram port with an AN814-4 or MS24391 plug.
3.5.1.6 Bleed port. The top of the housing shall incorporate an MS33649-4 air bleed port, located such
that optimum bleeding of entrapped air within the filter will be insured. The bleed port shall be fitted
with an AN814-4 or MS24391 plug.
3.5.2 E l e m e n t
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