(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 that float is requested; and

(2) The vertical loads prescribed in §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 §29.521. An appropriate
load distribution under critical conditions must be used.