When AMB is not active, Class C lower limit over AMB is 4,500 ft (30 nm BN).
The Amberley military control zone lies just 8 nm west of Archerfield. Clearance is required to transit the area when active. Tracking outbound, avoid the inbound reporting point of Goodna. Track north-west to Lake Manchester or south-west to Spring Mountain. Request clearance through Amberley Delivery (134.6) in plenty of time before reaching the control zone boundary.