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7/11/96
gation agreements and shall be transmitted on request to supersonic aircraft prior to commencement of deceleration/ descent from supersonic cruise:
a)  current meteorological reports and forecasts, except that where communications difficulties are encountered under conditions of poor propagation, the elements transmitted may be limited to:
i)  mean surface wind, direction and speed (including gusts);
ii)  visibility or runway visual range;
iii) amount and height of base of low clouds;
iv)  other significant information;
Note.— See Part IX, 4.3.2.3.8.
v)  if appropriate, information regarding expected changes;
b)  operationally significant information on the status of facilities relating to the runway in use, including the precision approach category in the event that the lowest approach category promulgated for the runway is not available;
c)  sufficient information on the runway surface conditions to permit assessment of the runway braking action.
1.4 Air traffic advisory service

1.4.1  Objective and basic principles
1.4.1.1 The objective of the air traffic advisory service is to make information on collision hazards more effective than it would be in the mere provision of flight information service. It may be provided to aircraft conducting IFR flights in advisory airspace or on advisory routes (Class F airspace). Such areas or routes will be specified by the State concerned.
1.4.1.2 Taking into account the consideration detailed in 2.4 of Annex 11, air traffic advisory service should only be implemented where the air traffic services are inadequate for the provision of air traffic control and the limited advice on collision hazards otherwise provided by flight information service will not meet the requirement. Where air traffic advisory service is implemented, this should be considered normally as a temporary measure only until such time as it can be replaced by air traffic control service.
VII. Flight Information Service and Alerting Service
1.4.1.3 Air traffic advisory service does not afford the degree of safety and cannot assume the same responsibilities as air traffic control service in respect of the avoidance of collisions, since information regarding the disposition of traffic in the area concerned available to the unit providing air traffic advisory service may be incomplete. To make this quite clear, air traffic advisory service does not deliver “clearances” but only “advisory information” and it uses the word “advise” or “suggest” when a course of action is proposed to an aircraft.
Note.— See 1.4.2.2.

1.4.2 Aircraft
1.4.2.1 Aircraft using the air traffic advisory service

1.4.2.1.1 IFR flights electing to use or required by the appropriate ATS authority on the basis of regional air navigation agreements to use the air traffic advisory service when operating within Class F airspace are expected to comply with the same procedures as those applying to controlled flights except that:
a)  the flight plan and changes thereto are not subjected to a clearance, since the unit furnishing air traffic advisory service will only provide advice on the presence of essential traffic or suggestions as to a possible course of action;
Note 1.— It is assumed that a pilot will not effect a change in the current flight plan until he has notified the intended change to the appropriate ATS unit, and, if practicable, has received acknowledgement or relevant advice.
Note 2.— When a flight is operating or about to operate in a control area to continue eventually into an advisory area or along an advisory route, a clearance may be issued for the whole route, but the clearance as such, or revisions thereto, applies only to those portions of the flight conducted within control areas and control zones (3.7.3.4 of Annex 11). Advice or suggestions would be provided as necessary for the remaining portion of the route.
　
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