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|  MIL-H-3177C
$.5.4.12 Service life. Subject the preproduction model heaters (one
in vertical, one in horizontal installation-adaptation) to a service-life-
simulation series of preheat cycles according to the following procedure
and the schedule in Table VII. In each cycle, cool, and soak-out the
heater to the Specified ambient temperature, than start and operate with
gradually increasing coolant temperatures until cutoff by the cycling control
occurs, followed by normal purging. Then control coolant temperature to drop
gradually until restart by the] cycling control occurs. Continue to operate
until the prescribed time requirement for that cycle is fulfilled. (Coolant
temperature may be controlled to prevent more than one automatic cutoff
and restart per preheat cycle. Cooldown time shall be at least 5 minutes
from automatic cutoff to restart. Soak-out time before each cycle shall.
be at least equal to the specified operating time for that cycle, after
thermocouples Indicate full cooldown of heater and coolant.) Complete
the prescribed number of cycles on each fuel in the sequence gasoline,
jet fuel, and diesel fuel, before starting any cycles at the next lower
temperature. Nonconformance to 3.8.5 shall constitute failure] of this
test.
Service Lift Test
Table VII.
4.5.4.13 Electromagnetic interference. The preproduction model shall
be tested to determine conformance to 3.8.6. The supplier shall furnish
the contracting officer a report of tests required by MIL-STD-461. Dis-
approval of the report shall constitute failure of this test.
4.5.4,14 Noise level. Noise levels shall be determined in accordance
with the procedures contained in MIL-STD-1474. Nonconformance to
3.23 shall constitute failure of this test.
4.5.4.15 Human factors. The heater shall be evaluated throughout the
testing to determine that the human factors criteria of 3.24 have been met.
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