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MIL-N-81497A(AS)
3.3.1
Total Weight - The total weight of this equipment
exluding cables, shall be a minimum consistent with good design
and shall not exceed 85.0 pounds.
Reliability -
3.3.2
Operational Stability - The equipment shall be
3.3.2.1
designed to operate with satisfactory performance, continuously
or intermittently for a period of at least 500 operating hours or 6
months whichever occurs first, without the necessity for readjustment
of any controls which are inaccessible to the operator during normal use.
Operating Life - The equipment shall have a total
3.3.2.2
operating life of 25,000 hours with reasonable servicing and replace-
ment of parts.  Parts requiring scheduled replacement shall be
specified by the contractor.
3.3.2.3
Reliability in Mean Time Between Failure (MTBF) -
the equipment shall have 750 hours of mean (operating) time between
failures when tested and accepted as outlined under the requirements of 4.4.3.
Time Totalizing Meter - The equipment shall contain
3.3.2.4
time totalizing meters in accordance with MIL-M-7793.  Meters shall
have a range of 9999 hours, and shall be included in the following
units:
Type of Meter
Unit
MS17322
Gyroscope Assembly
MS17322
Computer,
Navigation
Power Supply
MS17322
Cabling and Connections
3.3.3
Cables and Connectors - The equipment shall provide
3.3.3.1
for the use of cables and connectors in accordance with MIL-E-5400.
Interconnection Cabling - The equipment shall be
3.3.3.2
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 inter-
ference control requirements and provided 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.
5

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