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Additional airworthiness requirements for the certification of a helicopter, in addition to Appendix B, include the following:
Each helicopter intended to be used for air transport must be equipped with external doors and exits that—
(1) are operable from the inside and the outside; and
(2) are unobstructed by seats, seat backs, or other equipment; and
(3) have a means—
(i) of locking that prevents inadvertent opening in flight by persons or as a result of mechanical failure; and
(ii) when the door is normally used to load and unload the helicopter, of visually indicating to the crew members that the door is not fully closed and locked.
Each emergency exit and its means of access on a helicopter intended to be used for air transport must be clearly and conspicuously marked—
(1) such that its identity and location is recognisable from a distance equal to the width of the cabin; and
(2) with its means of opening.
