Operation

HIMore than one rope may be fed through the double crab.

egardless of the type of belay device, two Marines will be required in lowering. One to operate the belay device (i.e. crab brake) and one to monitor the safety prusik.

NOTE: The double carabiner brake/double crab is a one way brake used for lowering only and cannot be reversed under a load.

TRANSITION: Now that we have covered the operation, are there any questions? If there are none for me, then I have some for you.

PRACTICE (CONC)

a. Students will construct an A-frame and vertical hauling line and operate a vertical hauling line.

PROVIDE HELP (CONC)

a. The instructors will assist the students when necessary. OPPORTUNITY FOR QUESTIONS (3 Min)

1 QUESTIONS FROM THE CLASS 1 QUESTIONS TO THE CLASS

What is the purpose of a vertical hauling line?

A. The purpose of a vertical hauling line is to move equipment and troops over steep, rocky terrain.

Q What are the four criteria for site-selection for a vertical hauling line?

Q(1) Suitable to anchor.

(2) Good loading and unloading platform.

(3) Sufficient clearance for the load.

(4) Butt ends of the A-Frame must be anchored.

SUMMARY (2 Min)

a During this period of instruction we have discussed the materials needed to construct a vertical hauling line with an A-frame and the actual techniques involved in the construction of an A-frame and a vertical hauling line.

3 Those of you with IRF's please fill them out at this time and turn them in to the instructor. We will now take a short break.

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