CAT.IDE.H.180 Public address system

(a) Helicopters with an MOPSC of more than nine shall be equipped with a public address system, with the exception of (b).

(b) Notwithstanding (a) helicopters with an MOPSC of more than nine and less than 20 are exempted from having a public address system, if:

(1)  the helicopter is designed without a bulkhead between pilot and passengers; and

(2)  the operator is able to demonstrate that when in flight, the pilot’s voice is audible and intelligible at all passengers’ seats.