OPERATION IN HEAVY SNOW.
A higher air beam pressure setting should only be used during winter in locations where
heavy snow is possible.
a. LMS crew sets rib pressure gage set points to 2.0 psi (min.) and 2.9 psi (max.) when heavy snow
loads are expected.
b. Turn on NBC fan and maintain interior inflated ABS pressure at 0.5 iwg if heavy loads of snow are
expected to accumulate on ABS. Vent openings on ambulatory and TALP airlock door can be
2.27 OPERATION IN HIGH WINDS.
High winds may cause inflated ABS to be unstable and possibly collapse. Wind stability and survivability of
inflated ABS depends on the holding strength of ground stakes, the amount of weight around the edges of
ABS floor, the air beam pressure, and whether the system is under NBC conditions (over pressurized). For
high wind conditions:
a. Cab Crew Tasks
Locate high wind catenary (1, figure 2-57) along each side of ABS (2).
Set eleven (24 inch) stakes (3) as shown.
Loop high wind lines (4) around stakes (3) and adjust with slips (5).
b. LMS Crew Tasks
To prevent death or injury to personnel from contamination, ensure NBC SHELTER
PRESSURE gage reads at least 0.5 iwg.
NBC over pressure must be greater than wind pressure outside ABS.