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Note.- The term obstacle is used in this Annex solely for along the reciprocal of the designated track.
the purpose of specrfiing the charting of objects that are considered
a potential hazard to the safe passage of aircraft in the
Note I.- Procedure turns are designated "left" or "right"
type of operation for which the individual chart series is
according to the direction of the initial turn.
designed.
Obstacle clearance altitude (OCA) or obstacle clearance
height (OCH). The lowest altitude or the lowest height
above the elevation of the relevant runway threshold or the
aerodrome elevation as applicable, used in establishing
compliance with appropriate obstacle clearance criteria.
Note I .- Obstacle clearance altitude is referenced to mean
sea level and obstacle clearance height is referenced to the
threshold elevation or in the case of non-precision approaches
to the aerodrome elevation or the threshold elevation if that is
more than 2 m (7 ft) below the aerodrome elevation. An
obstacle clearance height for a circling approach is
referenced to the aerodrome elevation.
Note 2.- For convenience when both expressions are used
they may be written in the form "obstacle clearance
altitude/height" and abbreviated "OCA/H".
Note 3.- See Procedures for Air Navigation Services -
Aircraft Operations (Doc 8168), Volume I, Part 111, 1.5, and
Volume II, Part 111, 6.4, for specific applications of this
definition.
Obstacle free zone (OFZ). The airspace above the inner
approach surface, inner transitional surfaces, and balked
landing surface and that portion of the strip bounded by
these surfaces, which is not penetrated by any fixed
obstacle other than a low-mass and frangibly mounted one
required for air navigation purposes.
Note 2.- Procedure turns may be designated as being
made either in level flight or while descending, according to
the circumstances of each individual procedure.
Prohibited area. An airspace of defined dimensions, above the
land areas or tenitorial waters of a State, within which the
flight of aircraft is prohibited.
Radar vectoring. Provision of navigational guidance to aircraft
in the form of specific headings, based on the use of radar.
Relie$ The inequalities in elevation of the surface of the Earth
represented on aeronautical charts by contours, hypsometric
tints, shading or spot elevations.
Reporting point. A specified geographical location in relation
to which the position of an aircraft can be reported.
Required navigation performance (RNP). A statement of the
navigation performance necessary for operation within a
defined airspace.
Note.- Navigation per$ormance and requirements are
defined for a particular RNP type andor application.
Resolution. A number of units or digits to which a measured
or calculated value is expressed and used.
Restricted area. An airspace of defined dimensions, above the
land areas or tenitorial waters of a State, within which the
Chapter I Annex 4 - Aeronautical Charts
flight of aircrafit is restricted in accordance with certain a) Aircraft stand taxilane. A portion of an apron designated
specified conditions. as a taxiway and intended to provide access to aircraft
stands only.
Reversal procedure. A procedure designed to enable aircraft
to reverse direction during the initial approach segment of b) Apron taxiway. A portion of a taxiway system located
an instrument :~pproach procedure. The sequence may on an apron and intended to provide a through taxi route
include procedure turns or base turns. across the apron.
RNP type. A containment value expressed as a distance in
nautical miles liom the intended position within which
flights would be for at least 95 per cent of the total flying
time.
Example.- RNI' 4 represents a navigation accuracy of plus
or minus 7.4 km (4 NM) on a 95 per cent containment basis.
Runway. A defined rectangular area on a land aerodrome
prepared for the landing and take-off of aircraft.
Runway-holding position. A designated position intended to
protect a runway, an obstacle limitation surface, or an
ILSIMLS critical/sensitive area at which taxiing aircraft
and vehicles shall stop and hold, unless otherwise
authorized by the aerodrome control tower.
Runway strip. A defined area including the runway and
stopway, if provided, intended:
a) to reduce the risk of damage to aircraft running off a
runway; and
c) Rapid exit taxiway. A taxiway connected to a runway at
an acute angle and designed to allow landing aeroplanes
to turn off at higher speeds than are achieved on other
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