15.8.1 Such means as are necessary should be provided
to enable the crew to communicate between, and have access to, each
other and with other occupants of the craft in both normal and emergency
conditions.
15.8.2 Means to communicate between the operating
compartment and spaces containing essential machinery, including any
emergency steering position, irrespective of whether the machinery
is remotely or locally controlled, should be provided.
15.8.3 Means for making public address and safety
announcements from control stations to all areas to which passengers
and crew have access should be provided.
15.8.4 Provisions should be made for means to
monitor, receive and transmit radio safety messages at the operating
compartment.