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Page Title:
Reliability in Mean-Time-Between-Failures (MTBF) |
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|  MIL-N-81604C(AS)
3.3.2.3 Reliability in Mean-Time-Between-Failures (MTBF) - The
equipment, including any built-in-test (BIT) provisions and the
battery associated circuitry (charging circuit and changeover
circuit), shall have a specified reliability of 700 hours mean
(operating) time between failures when tested in accordance with
MIL-STD-781B. The reliability apportionment (minimum MTBF/unit)
shall be as shown in table I.
RELIABILITY APPORTIONMENT
TABLE 1.
MTBF (Minimum)
Unit
1,800
hours
Inertial Measuring Unit (IMU)
2,000
hours
Air Navigation Computer Unit (ANCU)
13,200
hours
Control Indicator Unit (CIU)
17,300
hours
Power Supply Unit (PSU)
4,175
hours
Converter AmPlifier Unit (CAU)
3.3.2.4 Elapsed Time Indicators- Each unit listed in 1.2,
exceept for mounts, shall contain an electromechanical elapsed
time indicator which shall meet the requirements of MIL-M-7793
and conform to MS-17322D. The indicators shall be located
so that they may be read without removing covers or any other
parts from the units. The indicators shall be energized during
all equipment "ON: time periods. "ON" time is defined as any
operating mode, including BIT.
3.3.3 Cables and Connections -
3.3.3.1 Cables and Connectors - The equipment shall provide for
the use of external cables and connectors in accordance with
Where possible, all cable connectors shall be elec-
MIL-E-5400.
trically bonded in accordance with MIL-B-5087.
3.3.3.2 Interconnection Cabling. - The equipment shall be capable
of satisfactory operation using external wiring in accordance
with the applicable requirements of MIL-W-5088. The external
wiring shall be unshielded, except that a minimum number of the
individual wires may be shielded when demonstrated as necessary
to meet interference control requirements, and provided that the
assembly of the cable to its plugs may be easily accomplished.
External cables and that portion of the connectors attached to
the cables shall not be supplied as part of the equipment. The
equipment shall be designed to operate utilizing the maximum
cable lengths specified in table II.
7
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