MIL-DTL-6162C
in accordance with MIL-C-5541 may be used in lieu of anodizing. Castings containing non-aluminum alloy integral
inserts may be treated with chemical films in accordance with MIL-C-5541 in lieu of anodizing. When abrasion
resistance is a factor, chemical films in accordance with MIL-C-5541 shall not be used in lieu of anodizing.
3.3.3 Color. With the exception of the surfaces listed below, all exposed surfaces shall be finished in a color
conforming to FED-STD-595, color No. 17875. As an alternate, the machine finish may be an aluminum or stainless
steel color. The finishes shall be unaffected by the environmental or performance tests specified.
EXCEPTIONS
a. Corrosion-resistant steel, copper, or bronze parts.
b. Cable.
c. Working surface.
d. Threads.
e. Oil holes.
f. Cadmium or zinc plated parts.
g. Those parts on which the application of paint has been demonstrated to the satisfaction of the
procuring activity to be impractical or unnecessary.
3.3.4 Lubricants. Unless otherwise specified, bearing lubricant shall conform to MIL-G-81322. Silicon base
grease shall not be used.
3.3.5 Varnishes and insulation. Silicone varnishes or insulation shall not be utilized.
3.3.6 Encapsulation. Encapsulation and embedment (potting) shall be in accordance with current industry
practices (reference MIL-HDBK-454, requirement 47), except that silicone compounds shall not be used.
3.3.7 Age control. Age control of all synthetic rubber parts except for fluorocarbon material shall be in
accordance with SAE AS-1933.
3.4 Design and construction. The machine design shall be consistent with good aircraft accessory practice and
conform to the associated specification sheet. Unless otherwise specified by the associated specification sheet, the
machine shall be designed to operate with voltage regulators conforming to MIL-R-23761 or current industry
practices.
3.4.1 Reliability. High equipment reliability is a primary objective. Trouble-free operation during a definite
specifiable period after initial installation and after overhaul is mandatory. In order to provide the required
reliability, the machine shall be fabricated and constructed to provide a specified minimum mean time between
failure (MTBF) in accordance with current industry practices (reference MIL-HDBK-781), of 2000 starting cycles
and 1500 hours of Class A or 1250 hours of Class B or C generator operation. If not used as a starter, the machine
shall have a specified MTBF of 2000 hours of Class A or 1650 hours of Class B or C generator operation, as
applicable, all based on a 90 percent confidence level. Failure is defined as any malfunction which results in
performance diminished from specification requirements no matter what the cause, undue careless handling or test
equipment malfunction excepted. For brush type machines, the above figures are predicated on one (1) change of
brushes (see 3.3).
3.4.2 Simplification. Simplicity of design resulting from the use of the same part for as many applications as
possible in a given model or various models is highly desirable. The machine shall have a minimum number of parts
consistent with reliability (see 4.6.1).
3.4.3 Interchangeability. All parts having the same manufacturer's part number shall be functionally and
dimensionally interchangeable (see 4.6.1). The drawing requirements of MIL-STD-100 shall govern changes in the
manufacturer's part number.
3.4.4 Maintainability. Careful attention shall be given in the design to provide for ease of inspection, testing,
disassembly, maintenance, repair and re-assembly, preferably without the need for special tools or fixtures. Machine
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