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a) Take-off distance available (TODAH). The length of the
final approach and take-off area plus the length of
helicopter clearway (if provided) declared available and
suitable for helicopters to complete the take-off.
b) Rejected take-off distance available (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 FATO 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 system/frame.
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 — Aerodromes Volume II
96//1111//9975 2
No. 2
Geoid undulation. The distance of the geoid above (positive)
or below (negative) the mathematical reference ellipsoid.
Note.— In respect to the World Geodetic System — 1984
(WGS-84) defined ellipsoid, the difference between the WGS-
84 ellipsoidal height and orthometric height represents
WGS-84 geoid undulation.
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.
Helideck. 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 (aeronautical 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.
Safety area. A defined area on a heliport surrounding the
FATO 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
time the VOR station is calibrated.
Surface level heliport. A heliport located on the ground or on
the water.
Touchdown and lift-off area (TLOF). A load bearing area on
which a helicopter may touch down or lift off.
1.2 Applicability
1.2.1 The interpretation of some of the specifications in
the Annex expressly requires the exercising of discretion, the
taking of a decision or the performance of a function by the
appropriate authority. In other specifications, the expression
appropriate authority does not actually appear although its
inclusion is implied. In both cases, the responsibility for
whatever determination or action is necessary shall rest with
the State having jurisdiction over the heliport.
1.2.2 The specifications in Annex 14, Volume II shall
apply to all heliports intended to be used by helicopters in
international civil aviation. The specifications of Annex 14,
Volume I shall apply, where appropriate, to these heliports as
well.
1.2.3 Wherever a colour is referred to in this volume,
the specifications for that colour given in Appendix 1 to
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