made of nonslip, nonmarking, jet-fuel-resistant rubber. The steel box toe is constructed of cold- rolled carbon steel to provide a safety margin through greater compression resistance. The boot is designed for use by all aircrew members. Fitting The boot is fitted to the aircrew member and normally corresponds to his regular shoe size. Maintenance The aircrew member is responsible for main- tenance of the boot. Maintenance is limited to cleaning and polishing. Polish used for everyday care of shoes is acceptable. There are no authorized repairs, as the sole and heel should outwear the upper boot. Broken or worn laces may be replaced. SV-2 SURVIVAL VEST The SV-2B survival vest provides maximum useful storage for survival equipment, consistent with minimal bulk and weight. In addition, the survival vest provides for integration of a life preserver, anti-g coveralls, and the chest-mounted oxygen regulator. It does not interfere with use of either the regular or integrated-type parachute harness. The SV-2B vest is the latest authorized configuration for this series of survival vest. Configuration The SV-2B survival vest is constructed basi- cally of nylon cloth. An adjustable harness, leg straps, and an entrance slide fastener provide a means of fitting and securing the vest to the aircrew member. Elastic straps on the rear allow greater comfort and mobility of the wearer. Pockets are provided for stowage of survival items (fig. 4-4). When required, the chest-mounted oxygen regulator is located inside a pocket secured to the vest by means of hook and pile tape. Fittings The basic SV-2B survival vest is designed to fit chest sizes from 40 to 48 inches. By changing the elastic straps on the rear, the vest may be adapted to a wider size range. To fit an SV-2B properly, have the aircrew member wear all his normal flight gear, including the MA-2 torso harness, if used. Put the SV-2B vest on as if it were a jacket. Pass the leg straps through the crotch and attach the snap hooks. Adjust the leg and shoulder straps so that they are snug and the bottom of the vest is just above the hips. Examine the SV-2B for proper fit. If it is too loose, the elastic straps must be shortened. If it is too tight, you must lengthen the elastic straps. The pro- cedures for this adjustment, as well as main- tenance, calendar inspections, and cleaning, are covered in-depth in the Aircrew Personal Protective Equipment Manual, N A V A I R 13-1-6.7. ANTIEXPOSURE ASSEMBLIES Antiexposure assemblies are composed of several garments that protect the aircrew member in the event of immersion. Constant wear assemblies provide additional protection from cold weather. The constant wear assemblies consist of a waterproof outer garment worn over a ventilation liner and/or cold weather underwear. The quick-donning antiexposure suit is carried in the aircraft, and donned only in case of emergency. It consists of a waterproof outer garment equipped with permanently attached boots and wrist and neck seals. An inflatable hood and antiexposure mittens are stowed in the pockets. In case of emergency, the assembly is donned over the regular flight clothing. Either continuous-wear or quick-donning antiexposure suits, as appropriate, are provided for flight personnel and passengers when there is a significant risk of crashing in the water, and when any of the following conditions prevail: 1. The water temperature is 50°F or below. 2. The outside air temperature (OAT) is 32°F (wind chill factor corrected) or below. If the water temperature is between 50° and 60°F, the commanding officer of the unit concerned considers the following search and rescue (SAR) factors: 1. The maximum probable rescue time. This should be a function of mission distance, SAR equipment, and SAR location. 2. The lowest temperatures that will occur in the mission area during the time period of the flight. 3. Then by using table 4-1, he determines whether antiexposure suits are required. 4-6