ED Decision 2003/16/RM
(a) For main floats, the buoyancy necessary to support the maximum weight of the rotorcraft in fresh water must be exceeded by:
(1) 50%, for single floats; and
(2) 60%, for multiple floats.
(b) Each main float must have enough watertight compartments so that, with any single main float compartment flooded, the main floats will provide a margin of positive stability great enough to minimise the probability of capsizing.
ED Decision 2003/16/RM
(a) Bag floats. Each bag float must be designed to withstand:
(1) The maximum pressure differential that might be developed at the maximum altitude for which certification with the float is requested; and
(2) The vertical loads prescribed in CS 29.521(a), distributed along the length of the bag over three-quarters of its projected area.
(b) Rigid floats. Each rigid float must be able to withstand the vertical, horizontal, and side loads prescribed in CS 29.521. An appropriate load distribution under critical conditions must be used.
ED Decision 2003/16/RM
Water-based and amphibian rotorcraft. The hull and auxiliary floats, if used, must have enough watertight compartments so that, with any single compartment of the hull or auxiliary floats flooded, the buoyancy of the hull and auxiliary floats, and wheel tyres if used, provides a margin of positive water stability great enough to minimise the probability of capsizing the rotorcraft for the worst combination of wave heights and surface winds for which approval is desired.
CS 29.757 Hull and auxiliary float strength
ED Decision 2003/16/RM
The hull, and auxiliary floats if used, must withstand the water loads prescribed by CS 29.519 with a rational and conservative distribution of local and distributed water pressures over the hull and float bottom.