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Quantitative reliability requirements |
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|  MIL-V-85830(AS)
3.6.2 Selection of printed wiring boards. The selection of parts and
materials shall be as specified in MIL-STD-454, Requirement 17 or with the
approval of the acquiring activity. Microelectric technology should be
utilized to the fullest extent possible. Components shall be rated so that
the ventilator shall function within the limits of this specification after
extended inoperative periods while carried in military aircraft and subjected
to the varied range of environmental conditions defined herein. Nonrepairable
subassemblies, as outlined in MIL-E-5400, shall be used when practical.
3.6.2.1 Printed wiring board modifications. Printed wiring board
modifications shall be performed as specified in MIL-P-28809.
All electronic components shall be as
3.6.3 Electronic components.
specified in MIL-STD-454.
3.6.4 Insulating materials. Electrical Insulating materials shall be as
specified in MIL-STD-454, Requirement 11. Insulation for power circuits shall
be arc-resistant as specified in MIL-STD-454, Requirement 26.
3.6.5 Encapsulation and embedment. Materials for encapsulation and
embedment shall be as specified in MIL-STD-454, Requirement 47.
3.6.6 Semiconductor devices. Semiconductor devices shall be selected and
applied as specified in MIL-STD-454, Requirement 30. Microelectronic devices
shall be selected and applied as specified in MIL-STD-454, Requirement 64.
Use of nonstandard parts shall be substantiated by reliability data or testing
to assure adequate device reliability for the application.
Resistors shall be as specified In MIL-STD-454,
3.6.7 Resistors.
Requirement 33.
3.6.8 Capacitors. Capacitors shall be chosen and applied as specified in
MIL-STD-454, Requirement 2.
Soldering shall be as specified in MIL-STD-454,
3.6.9 Soldering.
Requirement 5.
3.6.10 Relays.
Relays shall be as specified in MIL-STD-454,
Requirement 57.
Wiring shall be as specified in MIL-W-16878.
3.6.11 Miring.
3.7 Hardware.
3.7.1 Fasteners. All fasteners, including bolts, screws, nuts, rivets,
washers and hinges shall be as specified in SD-24.
3.8 Quantitative reliability requirements. When tested in accordance with
MIL-STD-781 as specified in 4,8.3.3, the mean time between failure (MTBF) for
the ventilator, based on an exponential distribution of failure times, the
lower single sided 90 percent confidence limit, shall be 500 hours (excluding
The performance requirements specified in 3.9.1, 3.9.2, 3.9.3,
batteries).
3.9.4 and 3.9.5 shall be the reliability requirements for determining mean
time between failures.
3.9 Performance.
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