Instruction manual

PROFICIENCY IN SURVIVAL CRAFT AND RESCUE BOATS OTHER THAN
FAST RESCUE BOATS
6 10
Connection to the boat
Open the hook by pulling downwards on the release knob. Position the ring
in the cut out near the block. Press the hook closed between the hands. This will
return the pointer to the safe position and retain the ring which must not lie over
the tongue extension on the block.
WARNING
Hook release under load in a boat whose lifting sling is under tension will
cause the lifting ring to come off the hook with considerable violence. The boat
and lifting sling store up energy and act like a spring as the hook is released.
Boat crew must be made aware of this. Keep away from the ring and lifting sling.
Do not pull the lanyard until the boat is approximately 2 m. above the water.
Inspection and maintenance of 3.0 tonne Release Hook
Check the following visually :
- that the hook is securely attached to the loop at the end of the davit fall by
ensuring that the swaged eye on the end of the fall is secured under the cones,
and that the nut and bolt are secured by their tab washers.
- that there is no severe contamination. If so it should be washed off using a
suitable solvent cleaner. Apply the approved grease with a small brush, working
it well into the moving areas and parts of the mechanism. Do not use solidifying
or emulsifying grease.
- that all four circlips are in position on the hook and latch shafts.
Test hook operation and condition as follows:
- pull the operating knob to ensure that the hook opens fully and freely, and
that it can be reset easily and fully.
- check that the knob is secure on the end of the release cable.
- check that the cable is not frayed.
- hang a load of 9 kg. on the hook using a 25.4 mm dia. lifting ring. Operate
the hook by pulling the lanyard. The hook must open and release the load.
- close the hook. Hang a load of 50 kg. on the hook. Pull the lanyard. The
hook must not open. Release the lanyard completely, then pull the lanyard hard a
second time. This time the pawl will engage the second latch position. The hook
must open under lanyard action and release the load.
- check that the hook is secured to a suitable strong point nearby to prevent it
swinging with the ship’s motion.