Note.— See Part IX, 4.3.4 regarding messages containing information on aerodrome conditions.
8.1 Essential information on aerodrome conditions is information necessary to safety in the operation of aircraft, which pertains to the movement area or any facilities usually associated therewith. For example, construction work on a taxi strip not connected to the runway-in-use would not be essential information to any aircraft except one that might be taxied in the vicinity of the construction work. As another example, if all traffic must be confined to runways, that fact should be considered as essential aerodrome information to any aircraft not familiar with the aerodrome.
8.2 Essential information on aerodrome conditions shall include information relating to the following:
7/11/96
Rules of the Air and Air Traffic Services (PANS-RAC)
a)  construction or maintenance work on, or immediately adjacent to the movement area;
b)  rough or broken surfaces on a runway, a taxiway or an apron, whether marked or not;
c)  snow, slush or ice on a runway, a taxiway or an apron;
d)  water on a runway, a taxiway or an apron;
e)  snow banks or drifts adjacent to a runway, a taxiway or an apron;
f)  other temporary hazards, including parked aircraft and birds on the ground or in the air;
g)  failure or irregular operation of part or all of the aerodrome lighting system;
h)  any other pertinent information.
Note.— See Figure V-3.
8.3 Essential information on aerodrome conditions shall be given to every aircraft, except when it is known that the aircraft already has received all or part of the information from other sources. The information shall be given in sufficient time for the aircraft to make proper use of it, and the hazards shall be identified as distinctly as possible.
Note.— “Other sources” include NOTAM, ATIS broad-casts, and the display of suitable signals.
CONTROL OF AERODROME TRAFFIC
9. Order of priority for arriving and departing aircraft
9.1 An aircraft landing or in the final stages of an approach to land shall normally have priority over an aircraft intending to depart.
9.2 Departures shall normally be cleared in the order in which they are ready for take-off, except that deviations may be made from this order of priority to facilitate the maximum number of departures with the least average delay.

V. Aerodrome Control Service

10. Control of taxiing aircraft

10.1 When taxiing, a pilot’s vision is limited. It is important therefore for aerodrome control units to issue concise instructions and adequate information to the pilot to assist him to determine the correct taxi routes and to avoid collision with other aircraft or objects.
10.2 For the purpose of expediting air traffic, aircraft may be permitted to taxi on the runway-in-use, provided no delay or risk to other aircraft will result.
10.3 Except as provided in 10.3.1 or as prescribed by the appropriate ATS authority, aircraft shall not be held closer to the runway-in-use than at a runway-holding position.

Note.— Runway-holding position locations in relation to runways are specified in Annex 14, Volume I, Chapter 5.
10.3.1 Aircraft shall not be permitted to hold on the approach end of the runway-in-use whenever another aircraft is effecting a landing, until the landing aircraft has passed the point of intended holding.
Note.— See Figure V-4.
10.4 An aircraft known or believed to be the subject of unlawful interference or which for other reasons needs isolation from normal aerodrome activities shall be cleared to the designated isolated parking position. Where such an isolated parking position has not been designated, or if the designated position is not available, the aircraft shall be cleared to a position within the area or areas selected by prior agreement with the aerodrome authority. The taxi clearance shall specify the taxi route to be followed to the parking
　
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