Transition altitude. The altitude at or below which the vertical position of an aircraft is controlled by reference to altitudes.
Transition layer. The airspace between the transition altitude and the transition level.
Transition level. The lowest flight level available for use above the transition altitude.
Uncertainty phase. A situation wherein uncertainty exists as to the safety of an aircraft and its occupants.
Unmanned free balloon. A non-power-driven, unmanned, lighter-than-air aircraft in free flight.
Note.— Unmanned free balloons are classified as heavy, medium or light in accordance with specifications contained in Annex 2, Appendix 4.
VFR. The symbol used to designate the visual flight rules.
Rules of the Air and Air Traffic Services (PANS-RAC)
VFR flight. A flight conducted in accordance with the visual flight rules.
Visibility. The ability, as determined by atmospheric conditions and expressed in units of distance, to see and identify prominent unlighted objects by day and prominent lighted objects by night.
Visual approach. An approach by an IFR flight when either part or all of an instrument approach procedure is not completed and the approach is executed in visual reference to terrain.
Visual meteorological conditions. Meteorological conditions expressed in terms of visibility, distance from cloud, and ceiling, equal to or better than specified minima.
Note.— The specified minima are contained in Annex 2, Chapter 4.
VMC. The symbol used to designate visual meteorological conditions.
Way-point. A specified geographical location used to define an area navigation route or the flight path of an aircraft employing area navigation. Way-points are identified as either:
Fly-by way-point. A way-point which requires turn anticipation to allow tangential interception of the next segment of a route or procedure, or
Flyover way-point. A way-point at which a turn is initiated in order to join the next segment of a route or procedure.
No. 3
PART II. GENERAL PROVISIONS
SCOPE OF THE RULES OF THE AIR
AND AIR TRAFFIC SERVICES PROCEDURES
1. Relationship to other documents
Procedures contained in the present documents are complementary to the Standards and Recommended Practices contained in Annexes 2 and 11. They are supplemented when necessary by regional procedures contained in Part 1 of the Regional Supplementary Procedures (Doc 7030).
Note 1.— Although these procedures are mainly directed to air traffic services personnel, attention of pilots-in-command should be drawn to the following paragraphs in particular, which are of direct interest to them:
Part II: 8, 9, 10, 12.1, 13, 14, 15 and 17;
Part III: 6, 13, 16 and 17;
Part IV: 2.2, 4, 8, 9, 10.2, 10.3, 11.5 and 12;
Part V: 10.3 and 13.5;
Part VII: 1 and 2;
Part X;
Part XI and Appendices 1, 2, 4 and 5.
Note 2.— The objectives of the air traffic control service as prescribed in Annex 11 do not include prevention of collision with terrain. The procedures prescribed in this document do not therefore relieve the pilot of his responsibilities of ensuring that any clearance issued by air traffic control units are safe in this respect, except when an IFR flight is vectored by radar. See Part VI, 6.5.2.
2. Contents of the document
2.1 Part III contains the procedures applicable by air traffic control units providing area control service.
2.2 Parts III and IV contain the procedures applicable by air traffic control units providing approach control service.
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