MIL-PRF-14516G
interface
Fuel interface
3.6.2
4.6.2
X
Tent interface
3.6.3
4.6.3
X
4.3. Operating requirements verification. All operating requirements shall be verified as
follows.
4.3.1 Operation inspection. Verify proper operation during all performance and reliability
testing specified herein. Any use of electrical power for operation shall constitute a failure.
4.3.2 Ignition inspection. Observe heater on start. Failure of heater to operate using a match
as an ignition source shall constitute a failure. Failure of the heater to be operating within
specified smoke and efficiency readings within 15 minutes after lighting under any
environmental condition specified herein, shall constitute a failure.
4.3.3 Monitoring inspection. Observe the heater during operation. Inability to view entire
flame through a sight glass or similar means shall constitute a failure.
4.3.4 Liquid fuel verification. Verify fuel compatibility during environmental climate
testing of 4.5.2, and 4.5.3. Verify fuels do not degrade any heater components such as fuel lines
and gaskets during reliability testing.
4.3.5 Fuel supply inspection. During environmental and reliability testing determine
adequacy of siphon arrangement for safe usage, visually inspect fuel can for signs of heat
damage and measure fuel temperature at all times to verify safe temperature below flash point.
4.3.6 Fuel control test. Determine adequacy of the fuel control during environmental
climate testing of 4.5.2, and 4.5.3. Operate the heaters over the full range of settings. Measure
heat output as outline in Appendix A for each setting. Failure of the flow rate and heat output to
incrementally increase shall constitute a test failure. Measure the smoke level per Appendix A
over the range of settings during the climatic tests of 4.5.2, and 4.5.3. Any smoke readings
greater than #4 for over 30% of the range of settings shall constitute a failure. Presence of an
unsafe over fire condition during testing as evidenced by black smoke exiting the exhaust stack,
pulsing, sputtering or backfiring of the heater or excessive sooting shall constitute a failure.
During test of 4.3.2, measure flow rate to the heater at setting 4 after 1 hour of operation and
record. After one more hour of operation at a constant ambient temperature with the tent doors
closed and at a fuel control setting 4, measure the flow rate to the heater. An increase greater
than 10% over the previous reading shall constitute a failure.
4.3.7 On/off switch test. Connect a buret in-line with a gravity feed fuel supply line to the
fuel control. After the heater has been operating for a minimum of 10 minutes, turn the on/off
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