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| MILT81821
3.2.1.8 "Heat dissipation and cooling.
Trainer panels or items of equipment containing
heat-producing components shall be designed and arranged so that stabilized operating temperatures
do not exceed the rated temperatures of parts, equipment, and components exposed thereto. If this
cannot be accompIished, adequate provisions shall be made for the removal of heat. Where the rate
of heat emission is too high to warrant reliance upon natural convection for cooling, forced
ventilation shall be installed. Such ventilation shall prevent the stabilized operating temperatures of
parts, components, and equipment mounted in the enclosures from exceeding their rated
temperatures with an ambient air temperature of 90 F. Under any condition of operation, at an
ambient temperature of seventy-seven degrees (77) F, the temperature of exposed parts and
surfaces shall not exceed one hundred and forty degrees (140 ) F, except that the operating
controls and control panels shall not exceed one hundred degrees (100) F. Trainers shall be capable
of operating continuously for 4 hours or for the three complete cycles of operation, whichever is
longer, without overheating or damaging the equipment.
3.2.1.9 Input signals.
Simulated input signals may be provided in lieu of duplication of
equipment or system interface/interconnection with actual equipment on related trainer panels
when interface/interconnection is not feasible. Simulated input signals shall be identical to the full
range of variations which would be encountered on the actual system during normal maintenance
operation. Provision shall be incorporated for the utilization of all applicable organizational level
support equipment for complete organizational checkout of the system on organizational or dual
maintenance trainers in the same manner as it is used on the actual related end item. All simulated
input signals provided in lieu of actual equipment interface/interconnection shall be indicated in the
appropriate trainer descriptions in the Detail Specification. The method of simulation and
characteristics of the simulated signal shall be specified therein.
A means shall be provided for monitoring all output signals. All
3.2.1.10 Output signals.
applicable output signals incorporated in the trainer panels shall be listed, and the means of
monitoring these signals shall be indicated in the applicable trainer descriptions in the Detail
Specification.
The maintenance trainers programmed for use
3.2.1.11 Power requirements, general.
within the continental limits of the United States shall be designed to operate from a 120/208 VAC,
three (3) phase, four (4) wire, sixty (60) Hz power source, or appropriate power conversion units
utilizing this input power.
3.2.1 .11.1 Permanent power distribution systems.
Unless otherwise specified in the Detail
Specification the Government facility will include permanent electrical, hydraulic, and pneumatic
power distribution systems. The power conversion units required for the trainer operation shall be
contractor-furnished and shall be specified in the Detail Specification. The facility power
distribution requirements shall be specified in the facilities report specified in 3.4.7.2.
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