Instruction manual

PROFICIENCY IN SURVIVAL CRAFT AND RESCUE BOATS OTHER THAN
FAST RESCUE BOATS
5 2
Each rescue boat launching appliance shall be fitted with a powered
winch motor capable of raising the rescue boat from the water with its full rescue
boat complement of persons and equipment at a rate of not less than 0.3 m/s.
The arrangements of the launching appliance shall be such as to enable
safe boarding of the survival craft in accordance with the requirements of
paragraphs 4.1.4.2, 4.1.4.3, 4.4.3.1 and 4.4.3.2 of the L.S.A.Code.
b) Launching appliances using falls and a winch
The launching mechanism shall be so arranged that it may be actuated
by one person from a position on the ship's deck and, except for secondary
launching appliances for free-fall lifeboats from a position with in the survival craft
or rescue boat. When launched by a person on the deck, the survival craft or
rescue boat shall be visible to that person.
Falls shall be of rotation resistant and corrosion resistant steel wire rope.
In the case of a multiple-drum winch, unless an efficient compensatory
device is fitted, the falls shall be so arranged as to wind off the drums at the
same rate when lowering, and to wind on to the drums evenly at the same rate
when hoisting.
The winch brakes of a launching appliance shall be of sufficient strength
to withstand:
a) a static test with a proof load of not less than 1.5 times the
maximum working load;
b) a dynamic test with a proof load of not less than 1.1 times the
maximum working load at maximum lowering speed.
An efficient hand gear shall be provided for recovery of each survival
craft and rescue boat. Hand-gear handles or wheels shall not be rotated by
moving parts of the winch when the survival craft or rescue boat is being lowered
or when it is being hoisted by power.
Where davit arms are recovered by power, safety devices shall be fitted
which will automatically cut off the power before the davit arms reach the stops in
order to prevent overstressing the falls or davits, unless the motor is designed to
prevent such overstressing.
The speed at which the fully loaded survival craft or rescue boat is
lowered to the water shall not be less than that obtained from the formula:
S = 0.4 + 0.02 x H
where: * S is the lowering speed in metres per second
* H is the height in metres from the davit head to the
waterline with the ship in the lightest sea-going condition.
The maximum lowering speed shall be established by the Administration
having regard to the design of the survival craft or rescue boat, the protection of
its occupants from excessive forces, and the strength of the launching
arrangements taking into account inertia forces during an emergency stop
Every launching appliance shall be fitted with brakes capable of stopping
the descent of the survival craft or rescue boat and holding it securely when