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| MILT81821
(h) The trainer panels and related trainer peculiar materials and equipments
shall be designed to keep the maintenance requirements to a minimum,
both in level of skills and number of personnel required to maintain the
trainer.
(i) Minimum Mean Time To Repair (MTTR). The MTTR for the trainers shall
be based on the sum of the corrective maintenance down time for a given
period of time divided by the sum of all corrected maintenance actions for
that same period, excluding parts acquisition time. This period of time or
the MTTR requirement will be specified in the Detail Specification.
All maintenance training equipment shall be designed for
3.2.5 Environmental conditions.
normal operation in the average classroom environment, and to withstand transportation and
storage environments to be encountered. Average classroom environments include temperature
range of sixty-five degrees (65) F to ninety-five degrees (95) F; humidity range from
twenty-percent (20%) RH (relative humidity) to one-hundred percent (100!%) RH at seventy degrees
(70) F; and atmospheric pressure encountered at sea-level to one (1) mile altitude. The range of
conditions encountered during transportation and storage include temperature range from
minus-twenty degrees (-20) F to two-hundred degrees (200) F; humidity range of ten percent
(10%) RH at seventy degrees (70) F to one-hundred percent (100%) RH at one-hundred degrees
(100) F; and atmospheric pressure range from sea-level to thirty-thousand (30,000) ft altitude for
unpressurized aircraft cargo spaces. In addition, transportation environments include conditions
such as vibration, dust, acceleration, acoustical noise, shock, etc. encountered in transportation by
aircraft, trucks, and sea craft, and shock due to fork-lifting.
Trainer panels shall be designed to comply with the transportability
3.2.6 Transportability.
requirements of DOD INST. 3224.1. The trainers covered by this specification are transported
primarily by air-ride van and military transport aircraft. Design for transportability shall comply
with the requirements for these modes of transportation.
Trainers designated in the Detail Specification for air
3.2.6.1 Air transportability.
transportability shall be designed to comply with the appropriate air transportability requirements
of MILA8421.
In the event the size and weight limitations specified in
3.2.6.2 Disassembly for shipment.
3.2.2.2, severely limit trainer design for optimum training capability or would result in excessive
costs, consideration shall be given to the feasibility of partial disassembly of the trainer for
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