MIL-PRF-14516G
safety information. Presence of any hazards, injury to personnel or damage to equipment or
property resulting from testing shall constitute a failure.
4.3.14.1 Fuel flow inspection. Verify fuel flow stops entering the combustion area during a
flame loss condition.
4.3.14.2 Burner inspection. Verify no raw fuel accumulates in the combustion area of the
heater after shut off or during operation.
4.3.14.3 Exhaust test. Test for, at a minimum, carbon dioxide, carbon monoxide, ammonia,
nitrogen dioxide and formaldehyde while the heater is set up and operated in a GP Medium tent
using the Type I exhaust pipe in an ambient temperature of 40E F. The heaters shall operate for a
minimum of 8 hours and all doors shall be closed during testing with no one entering the tent during
the test. Any readings above the TLV-TWA as established by the ACGIH shall constitute a failure.
The test shall be conducted using JP-8 fuel.
4.3.14.4 Sharp edges. Visually inspect the heater. Presence of any non-functional sharp edges
shall constitute a failure.
4.3.14.5 Noise. Operate the heater at the high fire rate. Measure sound levels at a 3-foot
distance around the outside of the heater on four sides and the top. Any readings in excess of 60 dB
shall constitute a failure.
4.3.14.6 Bottom surface temperature inspection . Inspect temperature of base of heater in
contact with the floor during operation. Any readings in excess of 175E F shall constitute a
failure.
4.4 Support or ownership requirements. All support or ownership requirements shall be
verified as follows.
4.4.1 Mean Time Between Essential Function Failure (MTBEFF)/Maintenance Ratio (MR) test.
Four heaters shall each be placed on a reliability test for a minimum of 461 hours each for a total of
1844 hours collective. Testing shall be conducted at 68E F and the heaters shall be at a setting to
maintain 50,000 BTU/Hr. There shall be no more than one chargeable essential function failure
(cumulative ). Fuel type used for test shall be divided equally among DF-2 and JP-8. Perform
burner smoke spot, during the start and each 100 hour interval (" 10 hours) and once during the last
start cycle at the conclusion of this test for each unit operated. A maintenance ratio greater than
.0016 maintenance man-hour per operating hour for any maintenance other than PMCS shall
constitute a test failure. . An essential function failure (EFF) shall be scored when an incident results
in the loss or significant degradation of an essential function that can not be quickly (within 15
minutes) corrected by the crew using only on board tools, spares and repair parts. An incident that
causes catastrophic or critical hazards shall also be scored as an EFF.
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