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the helicopter touchdown-and lift-off. Note.- The value given indicates whether the angular
difference is East or West of True North.
Heliport. An aerodrome or a defined area on a structure
intended be used Or in part for the Manoeuvring area That part of an aerodrome to be used for the
departure and surface movement of helicopters. take-off, landing and taxiing of aircraft, excluding aprons.
HoMing procedure. A predetermined manoeuvre which keeps Marking. A symbol or group of symbols displayed on the
an aircraft within a specified airspace while awaiting surface of the movement area in order to convey aerofurther
clearance. nautical information.
Zhman Factors principles- Principles which apply to aero- Minimum sector altitude. The lowest altitude which may be
nautical design, certification, training, operations and used which will provide a minimum clearance of 300 m
maintenance and which seek safe interface between the (1 000 ft) above all objects located in an area contained
human and other system components by proper consider- within a sector of a circle of 46 km (25 NM) radius centred
ation to human performance. on a radio aid to navigation.
Hypsometric tints. A succession of shades or- colour
gradations used to depict ranges of elevation.
Initial approach segment. That segment of an instrument
approach procedure between the initial approach fix and the
intermediate approach fix or, where applicable, the final
approach fix or point.
Instrument approach procedure. A series of predetermined
manoeuvres by reference to flight instruments with specified
protection from obstacles from the initial approach fix,
or where applicable, from the beginning of a defined
amval route to a point from which a landing can be
completed and thereafter, if a landing is not completed, to
a position at which holding or en-route obstacle clearance
criteria apply.
Missed approach point (MAPt). That point in an instrument
approach procedure at or before which the prescribed
missed approach procedure must be initiated in order to
ensure that the minimum obstacle clearance is not
infringed.
Missed approach procedure. The procedure to be followed if
the approach cannot be continued.
Movement area. That part of an aerodrome to be used for the
take-off, landing and taxiing of aircraft, consisting of the
manoeuvring area and the apron(s).
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
Annex 4 - Aeronautical Charts Chapter 1
aerodrome elevation as applicable, used in establishing
compliance with appropriate obstacle clearance criteria.
Note 1.- Ob~~uccllee urunce altitude is referenced to mean
sea level and obstacle clearance height is referenced to the
threshold elevntinn nr in the rase 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 app,roach is referenced
to the aerodrome elevation.
Note 2.- For convenience when both expressions are used
they may be written in the form "obstacle clearance
altitudeheight" and abbreviated "OCMH".
Note 3.- See Procedures for Air Navigation Services -
Aircraft Operations (Doc 8168), Vol. I, Part 111, 1.5 and
Vol. 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.
Orthomehie height. Height of a point related to the geoid,
generally presented as an MSL elevation.
Point light. A luminous signal appearing without perceptible
length.
Position (geographical). Set of coordinates (latitude and
longitude) referenced to the mathematical reference
ellipsoid which define the position of a point on the surface
of the Earth.
Precbion approach procedure. An instrument approach
procedure utilizing azimuth and glide path information
provided by ILS or PAR.
Procedure turn. A manoeuvre in which a turn is made away
from a designated track followed by a turn in the opposite
direction to permit the aircraft to intercept and proceed
along the reciprocal of the designated track.
Note I.- Procedure turns are designated "leji" or "right"
according to the direction of the initial turn.
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