According to OPS regulations, a public address system is required to operate a helicopter with a maximum approved passenger seating configuration of more than:
According to 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.
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