Part 121 (Australian Air Transport Operations—Larger Aeroplanes) Manual of Standards 2020
Division 8Aeroplane interior communication systems
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Division 8—Aeroplane interior communication systems
11.36 Flight crew intercommunication system
(1) An aeroplane must be fitted with a flight crew intercommunication system that consists of one headset, and one microphone that is not of the hand-held type, for each flight crew member for the flight. (2) The aeroplane must also be fitted with, or carry, either: (a) another headset, and another microphone not of the hand-held type, in addition to those carried under subsection (1); or (b) a hand-held microphone and cockpit speaker that can enable any flight crew member to conduct all required communications within the crew or external to the aeroplane.
11.37 Crew interphone system
(1) This section applies if: (a) a cabin crew member is required to be carried on an aeroplane for a flight; or (b) a crew member occupies a crew station remote from the flight deck. (2) An aeroplane must be fitted with a crew interphone system (the interphone system) in accordance with this section. (3) The interphone system, other than its handsets, headsets, microphones, selector switches and signalling devices, must operate independently of: (a) the flight crew intercommunication system; and (b) the public-address system. (4) The interphone system must be readily accessible for use by: (a) each flight crew member from the flight crew member’s seat in the flight crew compartment (cockpit); and (b) each cabin crew member at the cabin crew member’s crew station. (5) The interphone system must enable any crew member to activate an incoming call alert that: (a) uses aural or visual signals; and (b) distinguishes between normal and emergency calls. (6) The interphone system must provide 2-way communication between the following: (a) the flight crew compartment (cockpit) and each crew station in a passenger compartment; (b) the flight crew compartment (cockpit) and each galley located other than on the same level as a passenger compartment; (c) the flight crew compartment (cockpit) and each crew rest area located other than on the same level as a passenger compartment;