Table 2-2. Mission Predive Setup Procedure.

TM 5-4220-225-14 Table 2-2. Mission Predive Setup Procedure. Step Procedure NOTE Equipment requirements will be tailored to each dive mission. A briefing by the dive supervisor will indi- cate the specific requirements and all equipment for diving should be assembled on the diving station, including necessary support equipment such as tools and repair parts. The equipment must be laid out in an orderly manner and inspected and tested in accordance with these procedures. 1. HELMET ASSEMBLY NOTE (External Checks) Always rest the helmet on a rubber mat when inspecting or testing. Place the helmet on a bench with the communication whip extended over the side to avoid sharp flexing of the whip. a. Supply Valve Check. (1) Remove the supply valve handle and ensure the packing gland nut is snug. Reinstall the valve handle. (2) Check the valve for smooth operation through its full range (approximately three turns). Ensure the valve handle is secured firmly to the valve stem. b. Exhaust Valve Check. NOTE Between missions, stow helmet with the exhaust valve in the adjustable configuration; backoff the valve handle (fully open) to remove tension on the spring. (1) Lay the helmet assembly on its right side with the exhaust valve facing up. (2) Check the exhaust valve in accordance with the applicable procedure below. 2-27