Text in force at 29-59: from 29-3, effective 25 Feb 1968.
(a) For main floats, the buoyancy necessary to support the maximum weight of the rotorcraft in fresh water must be exceeded by--
(1) 50 percent, for single floats; and
(2) 60 percent, for multiple floats.
(b) Each main float must have [enough water-tight compartments so that, with any single main float compartment flooded, the mainfloats will provide a margin of positive stability great enough to minimize the probability of capsizing.]
33 FR 967 · Source