MIL-PRF-32504
continue during periods of reduced visibility, nighttime operations or with the shelter doors fully closed.
Visually inspect that the shelter system possesses a means to physically support the lights.
4.5.7.8 Environmental Control Unit: Verify that ECU s operate on power supply systems which match
those of the Main Electrical Distribution Panel. Observe performance which will accommodate and
secure a minimum of two sets of 16" diameter fabric ducts. These ducts and fabric interface shall allow
intake and exhaust from an external ECU, without loss of environmental or blackout protection.
4.6 Operating environment requirements:
4.6.1 Wind resistance verification: Perform the wind load demonstration or the alternative analysis.
4.6.1.1 Wind load demonstration: With the test shelter in the fully installed condition and all
doors/openings secured, perform a wind test for one hour with the wind velocity at 40 mph, with one 15
minute period at 90 mph at the following sites: Full Width End Door, Main Bay Fabric Panel/Framing
member interface, Personnel Access Door and the Roll-up or Sliding Vehicle Access Door. Inspect for
damage to fabric, findings, framing or operational deficiencies. Degradation of material or material
interface or operational capability shall constitute failure of this test.
4.6.1.2 Alternative wind load analysis: Demonstrate through mathematical analysis that shelter
materials and design have sufficient strength to withstand forces consistent with constant 90 mph wind
velocity.
4.6.2 Wind Driven Rain resistance demonstration: Perform rain resistance test on shelter fabric
representative sample which includes weather barrier fabric, the frame to fabric interface, frame to frame
assembly joint and external wind driven rain covering assembly. Test shall in in accordance with MIL-
STD 810 G, 506.5, Test Procedure II or equivalent.
4.6.3 Water resistance: Visually inspect erected shelter to determine if any water collects or pools on
the exterior of the erected test shelter.
4.6.4 Snow and sleet resistance verification: Perform the snow load test or the alternative analysis.
4.6.4.1 Snow load test: Erect a shelter with all doors, flaps and other openings configured for cold
weather blackout conditions. Perform this test on frozen soil, hard pan dry soil or asphalt/concrete to
simulate winter soil conditions. Evenly load the entire top surface of the shelter at a maximum of 8 lbs
per square foot. Apply the weight gradually and leave in place for an additional 12 hours. Typical user
adjustments, such as line tensioning, may be performed as necessary. Verify structural integrity and no
damage to the shelter.
4.6.4.2 Snow load alternative analysis: Demonstrate shelter material and design has sufficient strength
to provide protection while loaded at a maximum 8 lbs per square foot.
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