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MIL-S-8720B
3.3.2.3 Protective treatment. - When materials are used that are subject
to deterioration when exposed to climatic and environmental conditions likely
to occur during storage or service usage, they shall be protected against such
deterioration in a manner that will in no way prevent compliance with the
performance requirements of this specification. The use of any protective
coating that will chip, crack, abrade, peel, or scale with usage, age, or
extremes of climatic and environmental conditions shall be prohibited.
Anodizing plating, protective treatments, and painting of fuel system
strainers shall be as specified in the model specification and applicable
detail drawings.  Cadmium plating shall conform to class 2, type II of
QQ-P-416.  Chromium plating shall conform to class 2 of QQ-C-320.
3.3.2.4 Castings.-  Castings shall be clean, sound, and free from blow-
holes, porosity, and other defects.
3.3.3 Synthetic rubber ~ts.-
3.3.3.1 Serviceability.- All synthetic rubber parts shall be readily
replaceable with a nimimum replacement of attaching parts.
3.3 3.2 Age controls. - Age controls, if applicable, shall conform to
ANA Bulletin No. 438
3.3.3.3 Unformity - For components which include parts fabricated from
synthetic material in contact with fuel, manufacturers shall control subsequent
batches to provide for uniformity.
3.3.3.4 "O" ring packing. - "O" rings shall conform to MIL-P-5315,
MIL-R-25697, MIL-R-25988, and MS33666, MS33668, MS29513.
3.4 Design and construction. -
2.4.1 Design. - Fuel system strainers shall be designed in accordance with
standard aircraft practices.  The weight and size of the unit shall be kept
to a minimum.
3.4.1.1 Special tools.  - The design shall be such that disassembly and
replacement of parts of the fuel system strainer may be accomplished without
the use of special tools.
3.4.2 Detailed design requirements. - The detailed design requirements
shall be specified by the model specification and shall include the following
data, if applicable:
(a) Installation characteristics:
(1)
Mounting detail (include normal mounting position)
(2)
Envelope dimensions
Location, size, and type of plumbing and electrical connections
(3)
(4)
Servicing clearance
(5)
Direction of flow
4

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