TM 5-4220-226-14&P
1-12. Neck Clamp - continued.
1-13. Neck Dam System.
WARNING
Never modify neck dam to accommodate a dry suit. Ballooning
may occur putting the diver at risk of injury or death.
The hood of the wet/dry suit should never be worn inside the
helmet. The neck dam seal, communications, and divers
breathing will be adversely affected.
a. The slot in the yoke that fits around the diver's neck is smaller than his head. It is improbable that the
helmet could be accidentally pulled from the head with the yoke in place.
b. The yoke hinges into place around the divers upper neck and the lower part of his head. The lower
part of the head cushion (inside the helmet) is pushed in by the yoke, thus section the helmet comfortably onto
the diver's head.
c. The neck dam is sandwiched between the yoke and the lower part of the head cushion, preventing
ballooning or any bellows effect from the breathing cycle.
1-14. Life Support System.
The Superlite 17B is designed for use with umbilical supplied air and emergency air supply. Only under very
controlled conditions should the helmet be used with a self-contained air supply (SCUBA mode). The flow of
the breathing medium (air or mixed gas) is described below.
1-4
