15.6.1 Special air-reports containing observations of volcanic activity shall be recorded on the special air-report of volcanic activity form. Forms based on the model form for special air-reports of volcanic activity at Appendix 1 shall be provided for flight crews operating on routes which could be affected by volcanic ash clouds.
Note.— The recording and reporting instructions may conveniently be printed on the back of the special air-report of volcanic activity form.
16. Forwarding of meteorological information
16.1 When receiving ADS reports which contain a meteorological information block, air traffic services units shall relay the basic ADS and meteorological information blocks without delay to the world area forecast centres (WAFCs) and, as appropriate, to regional area forecast centres (RAFCs).
16.2 When receiving special air-reports by data link communications, air traffic services units shall forward them without delay to their associated meteorological watch office, the WAFCs and, as appropriate, to RAFCs.
16.3 When receiving air-reports by voice com-munications, air traffic services units shall forward them without delay to their associated meteorological watch offices. In the case of routine air-reports which contain a Section 3, the air traffic services unit shall forward Section 1, sub-items 1 to 3 and Section 3.
17. Air traffic incident report
17.1 An air traffic incident report should be submitted, normally to the air traffic services unit concerned, for incidents specifically related to the provision of air traffic services involving such occurrences as aircraft proximity (AIRPROX) or other serious difficulty resulting in a hazard to aircraft, caused by, e.g.: faulty procedures, non-compliance with procedures, or failure of ground facilities.
17.2 Procedures should be established for the reporting of aircraft proximity incidents and their investigation to promote the safety of aircraft. The degree of risk involved in an aircraft proximity should be determined in the incident investigation and classified as “risk of collision”, “safety not assured”, “no risk of collision” or “risk not determined”.
17.3 When an accident/incident investigative authority conducts an investigation of an aircraft proximity incident, the air traffic services aspects should be included.
Note.— A model air traffic incident report form together with instructions for its completion is at Appendix 4. Further information regarding air traffic incidents is contained in the Air Traffic Services Planning Manual (Doc 9426).
18. Change of radiotelephony call sign for aircraft
18.1 An ATC unit may instruct an aircraft to change its type of radiotelephony (RTF) call sign, in the interests of safety, when similarity between two or more aircraft RTF call signs are such that confusion is likely to occur.
18.1.1 Any such change to the type of call sign shall be temporary and shall be applicable only within the airspace(s) where the confusion is likely to occur.
18.1.2 To avoid confusion, the ATC unit should, if appropriate, identify the aircraft which will be instructed to change its call sign by referring to its position and/or level.
18.1.3 When an ATC unit changes the type of call sign of an aircraft, that unit shall ensure that the aircraft reverts to the call sign indicated by the flight plan when the aircraft is transferred to another ATC unit, except when the call sign change has been co-ordinated between the two ATC units concerned.
18.1.4 The appropriate ATC unit shall advise the aircraft concerned when it is to revert to the call sign indicated by the flight plan.
19. Procedures in regard to aircraft equipped with airborne collision avoidance systems (ACAS)
19.1 The procedures to be applied for the provision of air traffic services to aircraft equipped with ACAS shall be identical to those applicable to non-ACAS equipped aircraft. 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：Rules of the Air and Air Traffic Services(33)
