MIL-PRF-14516G
switch to the off position and observe flow rate in the buret. Failure of fuel flow to stop
immediately upon activation of the off switch shall constitute a failure.
4.3.8 Fuel filtering inspection. Observe condition of filtering device after reliability testing.
Any heater shut downs related to particles bypassing the fuel filtering device or the device
rusting and preventing fuel flow shall constitute a failure. Failure to remove and replace the
filtering device for cleaning in less than 15 minutes using only common hand tools shall
constitute a failure.
4.3.9 Combustion efficiency test. During environmental testing of 4.5.2, and 4.5.3, after
durability testing, every 24 hours during reliability testing, and as required, measure efficiency
per procedure outlined in Appendix A. Any readings lower than 60% while the heater is
operating at 50,000 BTU/Hr or higher shall constitute a test failure.
4.3.10 Smoke test. During environmental testing of 4.8.2 and 4.8.3, after durability testing,
and every 24 hours during reliability testing, measure smoke readings per procedure outlined in
Appendix A. Any readings greater than a #4 during any required firing rate shall constitute a
failure.
4.3.11 Heat output test. See 4.5.2, 4.5.3
4.3.12 Exhaust pipe inspection. Inspect for presence of type I or type II exhaust pipe
assembly.
4.3.12.1 Type I exhaust pipe inspection. Inspect heater during operation and verify that the
exhaust pipe will pass through the opening in the GP medium tent. Verify the presence of an
exhaust pipe cap with guy lines or other means to keep exhaust pipe from blowing off in windy
conditions.
4.3.12.2 Type II exhaust pipe inspection. Inspect for the complete exhaust pipe assembly per
3.3.12.1, including smoke jack assembly when specified (see 6.2).
4.3.12.3 Smoke jack assembly inspection. Inspect for complete smoke jack assembly per
3.3.12.3.
4.3.13 Tilt test. Operate the heater. After the heater has stabilized tilt the heater 2 degrees
and operate for a minimum of 15 minutes. Failure of the heater to continue normal safe
operation shall constitute a failure. Perform this test a total of four times, tilting the heater in
both directions on the two bottom orthogonal axes.
4.3.14 Safety inspection. Observe test records and performance of all test and inspections
within this performance specification. Inspect heater system documentation for adequacy of
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