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operations are contained in Annex 6, Part IM
1.1 Definitions
When the following terms are used in this voluine they have
the meanings given below. Annex 14, Volume I contains
definitions for those terms which are used in both volumes.
Accuracy. A degree of conformance between the estimated or
measured value and the true value.
Note.- For measured positional data the accuracy is
nonnally expressed in tenns of a distance from 0 stated
position within which there is a defined confidence of the true
position falling.
Air tuiway. A defined path on the surface established for the
air taxiing of helicopters.
Air transit route. A defined path on the surface established for
the air transitting of helicopters.
Cyclic redundancy check (CRC). A mathematical algorithm
applied to the digital expression of data that provides a
level of assurance against loss or alteration of data.
Data quality. A degree or level of confidence that the data
provided meets the requirements of the data user in terms
of accuracy, resolution and integrity.
Deckrred distances - heliports.
a) Take-off distance available (TODAH). The length of the
final approach and take-off area plus the length of
helicopter cleanvay (if provided) declared available and
suitable for helicopters to complete the take-off.
b) Rejected take-off distance avuilable (RTODAH). The
length of the final approach and take-off area declared
available and suitable for performance class 1
helicopters to complete a rejected take-off.
c) Landing distance available (LDAH). The length of the
final approach and take-off area plus any additional area
declared available and suitable for helicopters to
complete the landing manoeuvre from a defined height.
Elevated heliport. A heliport located on a raised structure on
land.
Ellipsoid height (Geodetic height). The height related to the
reference ellipsoid, measured along the ellipsoidal outer
normal through the point in question.
Final approach and take-off area (FATO). A defined area
over which the final phase of the approach manoeuvre to
hover or landing is completed and from which the take-off
manoeuvre is commenced. Where the FAT0 is to be used
by performance Class 1 helicopters, the defined area
includes the rejected take-off area available.
Geodetic datum. A minimum set of parameters required to
define location and orientation of the local reference system
with respect to the global reference systernlframe.
Geoid. The equipotential surface in the gravity field of the
Earth which coincides with the undisturbed mean sea level
(MSL) extended continuously through the continents.
Note.- The geoid is irregular in shape because of local
gravitational disturbances (wind tides, salinity, current, etc.)
and the direction of gravity is perpendicular to the geoid at
every point.
ANNEX 14 - VOLUME 11. 1 6/11/97
No. 2
Annex 24 -Aerodromes Volume I1
Geoid undulation. The distance of the geoid above (positive)
or below (negative) the mathematical, reference ellipsoid.
Note.- In respect to the World Gcodetrc System - 1984
(WGS-84) defined elliproid the dgfSerence between the WGS-
84 ellipsoidal height and orthornerrlc helght represents
WGS-84 geoid undulatrnn.
Helicopter ground taxiway. A ground taxiway for use by
helicopters only.
Helicopter clearway. A defined area on the ground or water
under the control of the appropriate authority, selected and/
or prepared as a suitable area over which a performance
class 1 helicopter may accelerate and achieve a specific
height.
Helicopter stand. An aircraft stand which provides for parking
a helicopter and, where air taxiing operations are
contemplated, the helicopter touchdown and lift-off.
Helldeck. A heliport located on a floating or fixed off-shore
structure.
Heliport. An aerodrome or a defined area on a structure
intended to be used wholly or in part for the arrival,
departure and surface movement of helicopters.
Integrity (aemnautical data). A degree of assurance that an
aeronautical data and its value has not been lost nor altered
since the data origination or authorized amendment.
Orthometric height. Height of a point related to the geoid,
generally presented as an MSL elevation.
Safely area. A defined area on a heliport surrounding the
FAT0 which is free of obstacles, other than those required
for air navigation purposes, and intended to reduce the risk
of damage to helicopters accidentally diverging from the
FATO.
Station declination. An alignment variation between the zero
degree radial of a VOR and true north, determined at the
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