Air Traffic Incident Report

An air traffic incident report shall be submitted, for incidents specifically related to the revision of air traffic services involving such occurrences as aircraft proximity (AIRPROX) or other serious difficulty resulting in a hazard to aircraft, caused by, among others, faulty procedures, non- compliance with procedures, or failure of ground facilities.

The degree of risk involved in aircraft proximity should be determined in the incident investigation and classified as:

Risk of collision : the risk classification of an aircraft proximity in which serious risk of collision has existed. Example of this classification such as near-missed which is induced by ACAS RA. Another example when aircraft taking off from parallel runways and their paths are crossing one to each other and are not vertically separated, etc.

Safety not assured : the risk classification of an aircraft proximity in which the safety of the aircraft may have been compromised. Example of this classification such as during transition period from surveillance control to non-surveillance control (due to unserviceable/malfunction) where separation of 5 NM must be changed into non-surveillance separation (based on time or vertical). Another example when there is an aircraft executing emergency descent, etc.

No risk of collision : the risk classification of an aircraft proximity in which no risk of collision has existed. Example of this classification such as level bust that is an aircraft flies at level which is not conform to ATC instruction and vertically separated less than prescribed minima. Another example when the separation between aircraft is less than minima but both aircraft fly away one to each other, etc.

Risk not determined : the risk classification of an aircraft proximity in which insufficient information was available to determine the risk involved, or inconclusive or conflicting evidence precluded such determination. Example of this classification such as unidentified or strayed aircraft entering an area of jurisdiction of an ATC Unit. Another example when the conditions of visibility which prevent the aerodrome control tower from applying visual separation between aircraft, and between aircraft and vehicles operate on the maneuvering area.

Note.— Air traffic incident report form together with instructions for its completion is at attachment 28 on page 273.