Instruction manual

PROFICIENCY IN SURVIVAL CRAFT AND RESCUE BOATS OTHER THAN
FAST RESCUE BOATS
5 4
weight of the boat transferred to the falls before persons are embarked in the
boat.
Fig. 5.1 Gravity davit
Gravity davits are provided with a safety device which will prevent the
davits from operating while it is in position. This device usually takes the form of
a trigger to which the gripes are attached and is so adjusted that while the gripes
are “on”, the davits cannot operate.
In addition, holes are being inadvertently operated in port. These bolts,
known as “Harbour safety pins “are to be shipped only in port.
When the falls and winches are being overhauled the lifeboat must be
floated or landed before the falls are let go for overhauling.
Harbour safety pins are always to be unshipped before the vessel
proceed to sea, so that the boats are at all times ready for immediate use.
Gravity davit “Miranda “System
The boat is contained in and attached to a cradle that is hoisted to the
davit head by means of two single wire rope falls; there are therefore no floating
blocks. The boat is attached to the cradle by means of two short wire straps
placed between the cradle head and the boat’s lifting hooks. The painter whinch
is attached to the lifeboat by means os a quick release system is also attached to
the cradle and not to the ship.
The davits is static and contain no moving parts except the sheaves.
The gripes clear automatically as the boat is lowered by means of the control
wire, which is also situated at the helmsman’s position. No bowsing-in tackles or
tricing pendants are required.