MIL-PRF-85725A(AS)
3.4.1.9 Shock. The rack shall withstand the shock test as specified in 4.5.2.9 with no
material yield, failure, or loss of joint integrity.
3.4.1.10 Crash safety. The rack shall withstand the crash safety test as specified in 4.5.2.10
with no failure of the mounting attachment.
3.4.2 Mechanical.
3.4.2.1 Guide rails. The guide rails shall not deform or crack when tested as specified in
4.5.3.1.
3.4.2.2 Tier insertion/extraction. The rack shall withstand the test specified in 4.5.3.2 with no
physical or performance degradation. Each tier for Format B and C modules shall be capable of
being removed without extracting any modules. This requirement is not applicable for Format E
module racks.
3.4.2.3 Pressure drop. When tested in accordance with 4.5.3.3, the pressure drop from the
inlet of each cold rail to its exit shall be not greater than the values given in figure 4 over the
entire range of flows shown. Differences in pressure drops among different cold rails at the like
flow rates shall be not greater than two percent. The pressure drop from the inlet of the rack
enclosure to (and including) any of the exhaust ports, with no exhaust air collection, shall be not
greater than the values shown on figure 5 over the entire range of flows. The variation in such
values among the different exhaust ports shall be not greater than a one-percent flow rate
differential between any two cold rails at the maximum anticipated flow rate. For the designs
where all exhaust air is to be collected and exhausted through one single port, the pressure drop
shall not be greater than the values shown on figure 5. Under this condition, the flow rate
differential between any two cold rails shall be not greater than one percent at the maximum
anticipated flow rate.
3.4.2.4 Leakage. The maximum allowable leakage rate shall be not greater than two percent
of the maximum anticipated flow rate through the rack when tested as specified in 4.5.3.4.
3.4.3 Thermal. The rack shall be tested for thermal characteristics as specified in 4.5.4. The
rack shall dissipate at least 250 watts per tier for 26 Format B Span 2 modules dissipating equal
power. The racks shall dissipate at least 500 watts per tier for 26 Format C modules dissipating
equal power. The racks shall dissipate at least 1500 watts per tier for 30 Format E modules
dissipating equal power. The following conditions shall apply:
a. Cooling air inlet temperature: 27 °C ± 1 °C (81 °F ± 2 °F).
b. Ambient temperature: 71 °C ± 1 °C (160 °F ± 2 °F).
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