Instruction manual

PROFICIENCY IN SURVIVAL CRAFT AND RESCUE BOATS OTHER THAN
FAST RESCUE BOATS
5 1
5. Launching arrangements
5.1 Boat davits
5.1.1 Life Saving Appliance Code provisions
( Chapter Vl Launching and embarkation appliances)
a) General requirements
With the exception of the secondary means of launching for freefall
lifeboats, each launching appliance shall be so arranged that the fully equipped
survival craft or rescue boat it serves can be safely launched against
unfavourable conditions of trim of up to 10˚ and a list of up to 20˚either way:
a) when embarked as required with its full complement of persons;
b) with not more than the required operating crew on board.
Notwithstanding the requirements of paragraph (a) above, lifeboat
launching appliances for oil tankers chemical tankers and gas carriers with a
final angle of heel greater than 20˚ calculated in accordance with the
International Convention for the Prevention of Pollution from Ships,1973, as
modified by the 1978 Protocol, shall be capable of operating at the final angle of
heel on the lower side of the ship.
A launching appliance shall not depend on any means other than gravity
or stored mechanical power which is independent of the ship’s power supplies to
launch the survival craft or rescue boat it serves in the fully loaded and equipped
condition and also in the light condition.
Each launching appliance shall be so constructed that only a minimum
amount of routine maintenance is necessary. All parts requiring regular
maintenance by the ship's crew shall be readily accessible ano easily
maintained.
The launching appliance and its attachments other than winch brakes
shall be of sufficient strength to withstand astatic proof load on test of not less
than 2.2 times the maximum working load.
Structural members and all blocks, falls, padeyes, links, fastenings
and all other fittings used in connection with launching equipment shall be
designed with a factor of safety on the basis of the maximum working load
assigned and the ultimate strengths of the materials used for construction. A
minimum factor of safety of 4.5 shall be applied to all structural members, and a
minimum factor of safety of 6 shall be applied to falls, suspension chains, links
and blocks.
Each launching appliance shall, as far as practicable, remain effective
under conditions of icing.
A lifeboat launching appliance shall be capable of recovering the lifeboat
with its crew.