ALL DEPARTURES REQUIRING A PUSHBACK MUST CALL AIRWAYS CLEARANCE
DELIVERY (ACD) ON 127.2 WITH THEIR REQUEST 
ACD WILL INSTRUCT FLIGHTCREW TO 'MONITOR GROUND' OR 'MONITOR GROUND
ON 121.7'
WHEN CLEARANCE AVAILABLE 'MELBOURNE GROUND' (SMC) WILL ISSUE THE
PUSHBACK CLEARANCE OR OTHER INSTRUCTION
THIS PROCEDURE MAY BE USED AT ANY TIME AND WILL BE ADVISED VIA ATIS