GM1 SERA.6005 Requirements for communications and SSR transponder

CAA ORS9 Decision No.10

OBJECTIVE OF RADIO AND TRANSPONDER MANDATORY ZONES

(a)    The objective of a radio mandatory zone (RMZ) and a transponder mandatory zone (TMZ) is to enhance the conspicuity of aircraft operating within, or in the vicinity of, complex, or otherwise busy airspace when the establishment of a more restrictive classification of airspace is not warranted, in order to maintain a balance between safe, efficient operations and fair, equitable access for all airspace users.  Enhanced conspicuity can enable, as appropriate:

(1)    airborne collision warning and/or avoidance systems;

(2)    a ‘known’ or ‘recognised’ air traffic environment which, in turn, permits ATS to provide more specific traffic information on collision hazards; and,

(3)    ground-based safety nets such as short-term conflict alert (STCA) and minimum safe altitude warning (MSAW)

(b)    In addition, a RMZ may also be notified to facilitate:

(1)    the provision of flight information, alerting and search and rescue services; or,

(2)    coordination with appropriate military units or with ATS units in adjacent States in order to avoid the possible need for interception for the purpose of identification.