6.3 Loss of Seperation

6.3.1 If, for any reason, a controller is faced with a situation in which two or more aircraft, or an aircraft and an obstruction, or an aircraft and terrain are separated by less the prescribed minima (for example, air traffic control errors or differences in the pilot’s estimated and actual times over reporting points) he/she is to:

  1. Use every means at his/her disposal to obtain the required minimum separation with the least possible delay, and
  2. Pass essential traffic information as soon as possible,
  3. Whenever, as a result of failure or degradation of navigation, communications, altimetry, flight control or other systems, aircraft performance is degraded below the level required for the
  4. airspace in which it is operating, the flight crew shall advise the controller without delay. Where the failure or degradation affects the separation minimum currently being employed, the
  5. controller shall take action to establish another appropriate type of separation or separation minimum.

Except:

6.3.2 When a pilot reports a manoeuvre induced by an ACAS resolution advisory (RA), the controller shall not attempt to modify the aircraft flight path until the pilot reports returning to the terms of the current air traffic control instruction or clearance but shall provide traffic information as appropriate.

6.3.3 Once an aircraft departs from its clearance in compliance with a RA, the controller ceases to be responsible for providing separation between that aircraft and any other aircraft affected as a direct consequence of the manoeuvre induced by the RA. The controller shall resume responsibility for providing separation for all the affected aircraft when:

  1. The controller acknowledges a report from the flight crew that the aircraft has resumed the current clearance; or
  2. The controller acknowledges a report from the flight crew that the conflict is resolved and that the aircraft is resuming the current clearance or requires a re-clearance and issues an alternative clearance which is acknowledged by the flight crew.