6.1.2 Launching appliances using falls and a winch
6.
6.
.2.1 Every launching appliance using falls and a winch, except for secondary launching
appliances for free-fall lifeboats, shall comply with the requirements of paragraph 6.1.1
and, in addition, shall comply with the requirements of this paragraph:
.2.2 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 within 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.
6.1.2.3 Falls shall be of rotation-resistant and corrosion-resistant steel wire rope.
6.1.2.4 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.
6.1.2.5 The winch brakes of a launching appliance shall be of sufficient strength to
withstand:
.l a static test with a proof load of not less than 1.5 times the maximum working
load; and
.2 a dynamic test with a proof load of not less than 1.1 times the maximum
working load at maximum lowering speed.
6.1.2.6 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.
6.1.2.7 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.
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6.1.2.8 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 + 0.02H
where: S is the lowering speed in metres per second; and
H is the height in metres from the davit head to the waterline with the ship
at the lightest seagoing condition.
6.1.2.9 The lowering speed of a fully equipped liferaft without persons on board shall be
to the satisfaction of the Administration. The lowering speed of other survival craft,
fully equipped but without persons on board, shall be at least 70% of that required by
paragraph 6.1.2.8.
6.1.2.10 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. Means shall be incorporated in the
appliance to ensure that this speed is not exceeded.
6.1.2.11 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 loaded with
its full complement of persons and equipment; brake pads shall, where necessary, be
protected from water and oil.
6.1.2.12 Manual brakes shall be so arranged that the brake is always applied unless the
operator, or a mechanism activated by the operator, holds the brake control in the
"off' position.