MIL-PRF-40136K
4.5.3 Slope. The fully loaded units shall be moved along a side slope of 20 percent. The
procedure shall be repeated in the opposite direction. The truck shall be driven up-grade on a
ramp of 30 percent slope, then down-grade. After negotiating the ramps, the units shall be
operated at rated capacity for not less than 1 hour. Permanent deformation or damage to
components of the unit or failure to operate as prescribed shall constitute failure of this test.
4.5.4 Emergency stop. The type I unit shall be subjected to a series of emergency stops while
fully loaded. The truck shall be stopped while moving forward at 10 mph, then five consecutive
emergency stops from each of the following speeds: 20, 30, and 45 mph forward, and finally 10
mph in reverse. The type I unit shall be operated at rated capacity for not less than 1 hour on
completing the emergency stops. The fully loaded type II unit shall be subjected to a series of
emergency stops following the same procedure as for the type I unit, except that the emergency
stops shall be from 10, 20, and 35 mph in the forward direction and at 5 mph in reverse; five
consecutive times from each speed. The mounting and tiedown systems shall be inspected
throughout both tests. Permanent deformation or damage to components of the unit or failure to
operate as prescribed herein shall constitute failure of this test.
4.5.5 Tank leakage. The interior and exterior of the tank shall be completely cleaned of
foreign matter and dried. Once the tank is completely clean and dry, close all openings such as
valves and fill cap. Plug the fill cap vent, and subject the tank to a constant internal air pressure of
3.0 to 5.0 psig. Spray liquid detergent over the entire exterior surface of the tank at a pressure of
not less than 70.0 psig. Applying the liquid detergent by brush or other means shall not be
acceptable. Observe the exterior of the tank. Leaks shall be shown by fizzing or bubbling of the
liquid detergent. Surface rupture, leakage, deformation, or malfunctioning hardware shall
constitute failure of this test.
4.5.6 Pump unit. To include hoses, couplings, nozzles, valves, and filter separator.
4.5.6.1 Hydrostatic pressure. The pump unit shall be subjected to a hydrostatic pressure of
not less than 50 psi for 20 minutes. Any leakage, rupture, loss of pressure, permanent
deformation or damage to components shall constitute failure of this test.
4.5.6.2 Electromagnetic interference. The pump unit power leads shall be tested using the
CS101 method in MIL-STD-462. Test results not within the range of 30 Hz to 50 kHz shall
constitute failure of this test.
4.5.7 Environmental.
4.5.7.1 Operating temperature. A tank and pump unit shall be placed in a temperature-
controlled chamber. The chamber temperature shall be varied by hour to cycle through the
temperatures from -25 °F to 140 °F in a 24-hour period. Seven 24-hour cycles shall be run to
complete the test. The unit shall be examined before the test start and the condition of all items
noted. During the final cycle at -25 °F and 140 °F the pump unit shall be examined and placed in
operation for a 30-minute period. Permanent deformation or damage to components of the unit
or failure to operate as prescribed herein shall constitute failure of this test.
4.5.7.2 Storage temperature. A tank and pump unit shall be placed in a temperature-
controlled chamber. At a rate not to exceed 6 °F per minute, the chamber temperature shall be
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