Text in force at CS29-12: from CS29-0, effective 14 Nov 2003.
For Category A rotorcraft, if a range of hei ghts exists at any speed, including zero, within which it is not possi ble t o m ake a safe landing following power fai lure, t he range of hei ghts and its variation wi th forward speed must be established, together with an y o ther pertinent information, such as the kind of landing surface.
ED Decision 2003/016/RM · Source