MIL-DTL-24765A(NAVY)
3.5.5 Ambient temperature. The UPS shall start and operate satisfactorily and conform to all requirements
specified herein throughout an ambient temperature range of 0 to 50 °C.
3.5.6 Cooling. The UPS shall be cooled by ambient air of a temperature not greater than 50 °C. The cabinets
may be forced-air cooled. Where possible, air filters in accordance with MIL-PRF-16552 shall be used with forced-
air cooling.
3.5.7 Accessibility. Front access shall be provided, to the maximum extent possible, for operation and
maintenance.
3.5.8 Ship motion. The UPS shall operate satisfactorily when inclined 15 degrees permanently in any direction
or up to and including 45 degrees temporarily (less than or equal to one hour) in any direction.
3.5.9 Lifting provision. Each cabinet shall have provisions to permit hoisting and handling.
3.5.10 Humidity conditions. The UPS shall operate with relative humidity ranging up to 95±5 percent for both
intermittent and continuous periods including conditions wherein condensation takes place in and on the UPS
cabinets in the form of both water and frost.
3.5.11 Clearance for ventilation and accessibility. Maximum clearance allowed between the UPS cabinet and
adjacent equipment or structure shall be as follows:
a.
Bottom
-
No clearance allowed
b.
Sides
-
No clearance allowed
c.
Rear
-
6 inches
d.
Top
-
6 inches
e.
Front
-
30 inches
3.6 Reliability.
3.6.1 Reliability measure. The reliability measure shall be mean-time-between-failures (MTBF) and shall be
not less than 30,000 hours including battery bank. MIL-HDBK-781 may be used for guidance.
3.6.2 Definition of failure. The definition of failure for the purpose of determining the achievement of
reliability characteristics shall be input or output performance not in accordance with requirements specified herein.
3.7 Maintainability.
3.7.1 Maintainability measure. The maintainability measure shall be mean time to repair (MTTR) and shall be
not greater than 2 hours. MIL-HDBK-470 may be used for guidance.
3.7.2 Test equipment. The maintenance of the UPS shall not require the use of any special tools or equipment.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
First article inspection (see 4.2).
b.
Conformance inspection (see 4.3).
4.2 First article inspection. One UPS of each power rating shall be subjected to the examination and tests as
specified in table II.
4.3 Conformance inspection. Each UPS offered for delivery shall be subjected to the conformance inspection
as specified in table III.
4.4 Inspection conditions. Unless otherwise specified herein, tests shall be conducted under nominal existing
ambient temperature and humidity.
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