Nomenclature: S-749
Part Number (Unshielded): 206621
Part Number (Shielded): 206622

The S-749 shelter provides optimum performance under the most demanding field conditions. This lightweight, high strength, insulated, all-weather, mobile unit satisfies general purpose applications for housing communications and other transportable electronic equipment.
The S-749 shelter is of the same proven foam and beam construction as the widely used S-280 unit. Panel construction is a bonded sandwich consisting of a polyurethane foam core, aluminum skins and a framework of high strength all aluminum alloy extrusions. Structural strength is assured by orientation of the floor and roof beams in transverse directions. This "barrel hoop" construction provides the ability to withstand drop tests and high roof loads. Thick inner and outer floor skins (0.050 in.) lend added strength to withstand increased personnel or equipment traffic. Shelter corners are reinforced to accept side loads imposed by high wind velocities.
The S-749 is considered a mid-sized shelter within the family of transportable shelters. Although intermediate in size, the S-749 provides the maximum headroom available and accommodates personnel standing inside the unit.
When required, personnel gain a critical advantage - access to the transport vehicle from curbside. In fact, shelter length allows loading onto both standard 2-1/2-ton and 5-ton military trucks in the transverse orientation. The S-749 can be transported via military truck, helicopter, cargo aircraft such as the C-130, M720 and M832 mobilizers, and by rail and ship.

Performance Specifications:
Specification MIL-S-55286E
Weight: 1,050 lbs.
Payload: 3,500 lbs
Roof Load:
Snow and Ice: 40 lbs./sq. ft.
Personnel and Equipment: 660 lbs. over a 2 sq. ft. area
Floor Loads: 2,500 lbs. over 3 sq. ft. area without permanent deformation
Member Loading: Wall, roof, and floor tensile load 2,000 lbs. followed by 100 inch-pounds torque load (5/16"-18 inserts)
Temperature Extremes:
Operating: -65° F to +125° F plus solar load
Non-operating: -80° F to +160° F

Heat Transfer: U-factor 0.35BTU/hr./sq. ft./° F
RFI Shielding: With addition of RFI modification kit, attenuation of 60 dB minimum over 150 kHz to 10 GHz for electric and magnetic fields and plane waves measured IAW MIL-STD-285
Watertightness: Tested to 21 inch fording depth and to simulated rainfall
Lifting Eyes: Four (4) eyes with 3 in. inside clearance. 14,400 lbs. tensile load per corner in any direction
Towing Eyes: Four (4) eyes with 2 in. inside clearance. 14,400 lbs. tensile load per corner in any direction
Features:
Skids: Three (3) full length replaceable shock absorbing type
Roof Access Steps: Three (3) recessed folding steps in sidewall and one roof handhold
Combination lifting/tie down sling to facilitate handling
Options: RFI modification kit
Combination lifting/tie down sling to facilitate handling
Mobilizer adapter kit for shelter/transporter interface