Section III. PRINCIPLES OF OPERATION

TM 5-4220-226-14&P 1-8. Equipment Data. a. Helmet Weight: 24 pounds (approximate). b. Helmet Construction: Woven fiberglass and polyester resin. c. Maximum Operating Depth: 250 feet (IAC FM 20-11-1). 1-9. Safety, Care, and Handling. a. Safety. It is imperative that all safety precautions specified on the warning pages in front of this manual be observed. Also, observe specific warnings and cautions specified throughout this manual. The warnings are provided for protection from death or serious injury. b. Care and Handling. (1) Cleanliness is imperative in maintaining and handling diving system components. All tools and parts must be kept free of oil, grease, rust, or other contaminants. (2) Store helmet in a dry, well ventilated location, protected from pilferage, dampness, fire, dirt, insects, rodents, and direct sunlight. Section III. PRINCIPLES OF OPERATION 1-10. General. This section describes how the diving helmet operates. 1-11. Head Attached Dry Diving Helmet. The helmet is attached directly to the diver's head. It moves with the divers head and handles similarly to a diving mask. Primary advantages to this helmet compared to a mask are: a. Elimination of the mask face seal provides more comfort to the diver. Ear infection is reduced. Communications are improved both to and from the diver. b. It is unlikely that the helmet be accidentally pulled from the diver's head, even if diver is unconscious. 1-12. Neck Clamp. The neck clamp provides rapid locking in place of the helmet by the diver without assistance. 1-3