CHAPTER 6 — Operational Planning
Change A 6-55
MK 20 MOD 0 General
Characteristics
Principle of Operation:
Surface-supplied, open-circuit lightweight system
Minimum Equipment:
1.
MK 20 MOD 0 mask
2.
Harness
3.
Weight belt (as required)
4.
Dive knife
5.
Swim fins or boots
6.
Surface umbilical
Principal Applications:
Diving in mud tanks and enclosed spaces
Advantages:
1.
Unlimited by air supply
2.
Good horizo ntal mobility
3.
Voice and/or line-pull signal capabilities
Disadvantages:
1.
Limited physical protection
Restrictions:
1.
Work limits: 60 fsw
2.
Current - Above 1.5 knots requires extra
weights
3.
Enclosed space diving requires an Emergency
Gas Supply (EGS) with 50 to 150 foot whip
and second-stage regulator.
Operational Considerations:
1.
Adequate air supply system required
2.
Standby diver required
Figure 6-24. MK 20 MOD 0 General Characteristics.
MK 20 MOD 0 Helmet.
