One of the few parts of an aerodrome that GMC is not responsible for is the runway. This is the responsibility of the AIR controller. GMC must not allow any aircraft to enter a runway.
Crossing an active runway
If an aircraft taxing on the manoeuvring area needs to cross an active runway, they must not do so without:
permission from the AIR controller. This can be done in 2 ways:
1) GMC must coordinate with the AIR controller and request permission to taxi the aircraft across the runway. If the AIR controller agrees and gives permission, GMC can taxi the aircraft across the runway. The aircraft should be instructed to report when vacated. When it has, the AIR controller must be informed the runway is clear.
2) GMC will hand off the aircraft to the AIR controller. The AIR controller will then be in direct communication wih the aircraft and can instruct it when to cross. The aircraft can then be handed back to the GMC or remain with the AIR controller to continue its taxi. This must be coordinated at the time.
Crossing an Inactive runway
If an aircraft taxing on the manoeuvring area needs to cross an inactive runway, the GMC is permitted to allow the aircraft to cross that runway without coordinating with the AIR controller. The permission to cross can be included with the taxi clearance.