1.1. Definitions
When the following terms are used in this regulation they have the following meanings:
Accuracy. A degree of conformance between the estimated or measured value and the true value.
Note – For measured positional data, the accuracy is normally expressed in terms of
a distance from a stated position within which there is a defined confidence of the
true position falling.
Aerodrome. A defined area on land or water (including any buildings, installations and equipment)
intended to be used either wholly or in part for the arrival, departure and surface
movement of aircraft.
Aerodrome beacon. Aeronautical beacon used to indicate the location of an aerodrome from the air.
Aerodrome certificate. A certificate issued by the Minister of Traffic and Transport under established regulations
for the safe operation of an aerodrome within the Netherlands Antilles.
Aerodrome elevation. The elevation of the highest point of the landing area.
Aerodrome identification sign. A sign placed on an aerodrome to aid in identifying the aerodrome from the air.
Aerodrome reference point. The designated geographical location of an aerodrome.
Aerodrome traffic density.
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a) Light. Where the number of movements in the mean busy hour is not greater than 15
per runway or typically less than 20 total aerodrome movements.
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b) Medium. Where the number of movements in the mean busy hour is of the order of 16
to 25 per runway or typically between 20 to 35 total aerodrome movements.
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c) Heavy. Where the number of movements in the mean busy hour is of the order of 26 or
more per runway or typically more than 35 total aerodrome movements.
Note – The number of movements in the mean busy hour is the arithmetic mean over the
year of the number of movements in the daily busiest hour.
Note 2 – Either a take-off or a landing constitutes a movement.
Aeronautical beacon. An aeronautical ground light visible at all azimuths, either continuously or intermittently,
to designate a particular point on the surface of the earth.
Aeronautical ground light. Any light specially provided as anaid to air navigation, other than a light displayed
on an aircraft.
Airplane reference field length. The minimum field lengthrequired for take-off at maximum certificated take-off mass,
sea level, standard atmospheric conditions, still air and zero runway slope, as shown
in the appropriate airplane flight manual prescribed by the certificating authority
or equivalent data from the airplane manufacturer. Field length means balanced field
length for airplanes, if applicable, or take-off distance in other cases.
Note – Attachment A, Section 2 provides information on the concept of balanced field
length and the Airworthiness Manual (Doc 9760) contains detailed guidance on matters
related to take-off distance.
Aircraft Classification Number (ACN). A number expressingthe relative effect of an aircraft on a pavement for a specified
standard subgrade category.
Note – The aircraft classification number is calculated with respect to the center
of gravity (CG) position which yields the critical loading on the critical gear. Normally
the aft most CG position appropriate to the maximum gross apron (ramp) mass is used
to calculate the ACN. In exceptional cases the forward most CG position may result
in the nose gear loading being more critical.
Aircraft stand. A designated area on an apron intended to beused for parking an aircraft.
Apron. A defined area, on a land aerodrome, intended to accommodate aircraft for purposes
of loading or unloading passengers, mail or cargo, fuelling, parking or maintenance.
Apron management service. A service provided to regulatethe activities and the movement of aircraft and vehicles
on an apron.
Barrette. Three or more aeronautical ground lights closely spaced in a transverse line so that
from a distance they appear as a short bar of light.
Calendar. Discrete temporal reference system that provides the basis for defining temporal
position to a resolution of one day (ISO 19108*).
Capacitor discharge light. A lamp in which high-intensityflashes of extremely short duration are produced by
the discharge of electricity at high voltage through a gas enclosed in a tube.
Certified aerodrome. An aerodrome whose operator has beengranted an aerodrome certificate.
Clearway. A defined rectangular area on the ground or waterunder the control of the appropriate
authority, selected or prepared as a suitable area over which an airplane may make
a portion of its initial climb to a specified height.
Cyclic Redundancy Check (CRC). A mathematical algorithmapplied 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 dataprovided meet the requirements of the
data user in terms of accuracy, resolution and integrity.
Datum. Any quantity or set of quantities that may serve as areference or basis for the calculation
of other quantities (ISO 19104*).
Declared distances.
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a) Take-Off Run Available (TORA). The length of runway declared available and suitable
for the ground run of an airplane taking off.
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b) Take-Off Distance Available (TODA). The length of the take-off run available plus
the length of the clearway, if provided.
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c) Accelerate-Stop Distance Available (ASDA). The length of the take-off run available
plus the length of the stopway, if provided.
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d) Landing Distance Available (LDA). The length of runway which is declared available
and suitable for the ground run of an airplane landing.
Displaced threshold. A threshold not located at the extremity of a runway.
DCA NA. The Directorate of Civil Aviation Netherlands Antilles.
Effective intensity. The effective intensity of a flashing light is equal to the intensity of a fixed light of the same color which will produce the
same visual range under identical conditions of observation.
Ellipsoid height (Geodetic height). The height related to thereference ellipsoid, measured along the ellipsoidal outer
normal through the point in question.
Fixed light. A light having constant luminous intensity whenobserved from a fixed point.
Frangible object. An object of low mass designed to break,distort or yield on impact so as to present
the minimum hazard to aircraft.
Note – Guidance on design for frangibility is contained in the Aerodrome Design Manual,
Part 6 (in preparation).
Geodetic datum. A minimum set of parameters required todefine 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 theEarth 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.
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.
Gregorian calendar. Calendar in general use; first introduced in 1582 to define a year that more closely approximates
the tropical year than the Julian calendar (ISO 19108*).
Note – In the Gregorian calendar, common years have 365 days and leap years 366 days
divided into twelve sequential months.
Hazard beacon. An aeronautical beacon used to designate adanger to air navigation.
Heliport. An aerodrome or a defined area on a structureintended to be used wholly or in part
for the arrival,
departure and surface movement of helicopters.
Holding bay. A defined area where aircraft can be held or bypassed, to facilitate efficient surface
movement of aircraft.
Human Factors principles. Principles which apply toaeronautical design, certification, training, operations
and maintenance and which seek safe interface between the human and other system components
by proper consideration to human performance.
Human performance. Human capabilities and limitationswhich have an impact on the safety and efficiency
of aeronautical operations.
Identification beacon. An aeronautical beacon emitting acoded signal by means of which a particular point
of reference can be identified.
Instrument runway. One of the following types of runwaysintended for the operation of aircraft using
instrument approach procedures:
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a)
Non-precision approach runway. An instrument runway served by visual aids and a non-visual aid providing at least
directional guidance adequate for a straight-in approach.
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b)
Precision approach runway, category I . An instrument runway served by ILS and/or MLS and visual aids intended for operations
with a decision height not lower than 60 m (200 ft) and either a visibility not less
than 800 m or a runway visual range not less than 550 m.
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c)
Precision approach runway, category II. An instrument runway served by ILS and/or MLS and visual aids intended for operations
with a decision height lower than 60 m (200 ft) but not lower than 30 m (100 ft) and
a runway visual range not less than 350 m.
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d)
Precision approach runway, category III. An instrument runway served by ILS and/or MLS to and along the surface of the runway
and:
A – intended for operations with a decision height lower than 30 m (100 ft), or no
decision height and a runway visual range not less than 200 m.
B – intended for operations with a decision height lower than 15 m (50 ft), or no decision
height and a runway visual range less than 200 m but not less than 50 m.
C – intended for operations with no decision height and no runway visual range limitations.
Note 1 – See Part 10, Volume I for related ILS and/or MLS specifications.
Note 2 – Visual aids need not necessarily be matched to the scale of non-visual aids
provided. The criterion for the selection of visual aids is the conditions in which
operations are intended to be conducted.
Integrity (aeronautical data). A degree of assurance that anaeronautical data and its value has not been lost nor
altered since the data origination or authorized amendment.
Intermediate holding position. A designated position intendedfor traffic control at which taxiing aircraft and vehicles
shall stop and hold until further cleared to proceed, when so instructed by the aerodrome
control tower.
Landing area. That part of a movement area intended for thelanding or take-off of aircraft.
Landing direction indicator. A device to indicate visually thedirection currently designated for landing and for
take-off.
Laser-beam Critical Flight Zone (LCFZ). Airspace in theproximity of an aerodrome but beyond the LFFZ where the irradiance
is restricted to a level unlikely to cause glare effects.
Laser-beam Free Flight Zone (LFFZ). Airspace in the immediate proximity to the aerodrome where the irradiance is restricted
to a level unlikely to cause any visual disruption.
Laser-beam Sensitive Flight Zone (LSFZ). Airspace outside,and not necessarily contiguous with, the LFFZ and LCFZ where the
irradiance is restricted to a level unlikely to cause flash-blindness or after-image
effects.
Lighting system reliability. The probability that the completeinstallation operates within the specified tolerances
and that the system is operationally usable.
Maneuvering area. That part of an aerodrome to be used forthe take-off, landing and taxiing of aircraft,
excluding aprons.
Marker. An object displayed above ground level in order toindicate an obstacle or delineate
a boundary.
Marking. A symbol or group of symbols displayed on thesurface of the movement area in order
to convey aeronautical information.
Movement area. That part of an aerodrome to be used for thetake-off, landing and taxiing of aircraft,
consisting of the maneuvering area and the apron(s).
Non-instrument runway. A runway intended for the operationof aircraft using visual approach procedures.
Normal Flight Zone (NFZ). Airspace not defined as LFFZ,LCFZ or LSFZ but which must be protected from laser
radiation capable of causing biological damage to the eye.
Obstacle. All fixed (whether temporary or permanent) andmobile objects, or parts thereof, that
are located on an area intended for the surface movement of aircraft or that extend
above a defined surface intended to protect aircraft in flight.
Obstacle Free Zone (OFZ). The airspace above the innerapproach 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 frangible mounted one
required for air navigation purposes.
Orthometric height. Height of a point related to the geoid,generally presented as an MSL elevation.
Note 2 – Gravity-related heights (elevations) are also referred to as orthometric
heights while distances of points above the ellipsoid are referred to as ellipsoidal
heights.
Pavement Classification Number (PCN). A number expressingthe bearing strength of a pavement for unrestricted operations.
Precision approach runway, see Instrument runway.
Primary runway(s). Runway(s) used in preference to otherswhenever conditions permit.
Protected flight zones. Airspace specifically designated tomitigate the hazardous effects of laser radiation.
Road. An established surface route on the movement areameant for the exclusive use of vehicles.
Road-holding position. A designated position at whichvehicles may be required to hold.
Runway. A defined rectangular area on a land aerodromeprepared for the landing and take-off
of aircraft.
Runway End Safety Area (RESA). An area symmetrical about the extended runway centre line and adjacent to the end
of the strip primarily intended to reduce the risk of damage to an airplane undershooting
or overrunning the runway.
Runway guard lights. A light system intended to cautionpilots or vehicle drivers that they are about to
enter an active runway.
Runway-holding position. A designated position intended toprotect a runway, an obstacle limitation surface,
or an ILS/ MLS critical/sensitive area at which taxiing aircraft and vehicles shall
stop and hold, unless otherwise authorized by the aerodrome control tower.
Note – In radiotelephony phraseologies, the expression «holding point» is used to
designate the runway holding position.
Runway strip. A defined area including the runway andstopway, if provided, intended:
Runway turn pad. A defined area on a land aerodromeadjacent to a runway for the purpose of completing
a 180-degree turn on a runway.
Runway Visual Range (RVR). The range over which the pilotof an aircraft on the centre line of a runway can see
the runway surface markings or the lights delineating the runway or identifying its
centre line.
Safety Management System (SMS). A system for the management ofsafety at aerodromes, including the organizational
structure, responsibilities, procedures, processes and provisions for the implementation
of aerodrome safety policies by an aerodrome operator, which provides for control
of safety at, and the safe use of, the aerodrome.
Shoulder. An area adjacent to the edge of a pavement soprepared as to provide a transition
between the pavement and the adjacent surface.
Sign.
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a) Fixed message sign. A sign presenting only one message.
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b) Variable message sign. A sign capable of presenting several pre-determined messages
or no message, as applicable.
Signal area. An area on an aerodrome used for the display ofground signals.
Station declination. An alignment variation between the zerodegree radial of a VOR and true north, determined
at the time the VOR station is calibrated.
Stopway. A defined rectangular area on the ground at the endof take-off run available prepared
as a suitable area in which an aircraft can be stopped in the case of an abandoned
take off.
Switch-over time (light). The time required for the actualintensity of a light measured in a given direction
to fall from 50 per cent and recover to 50 per cent during a power supply changeover,
when the light is being operated at intensities of 25 per cent or above.
Take-off runway. A runway intended for take-off only.
Taxiway. A defined path on a land aerodrome establishedfor the taxiing of aircraft and intended
to provide a link between one part of the aerodrome and another, including:
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a)
Aircraft stand taxi lane. A portion of an apron designated as a taxiway and intended to provide access to
aircraft stands only.
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b)
Apron taxiway. A portion of a taxiway system located on an apron and intended to provide a through
taxi route across the apron.
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c)
Rapid exit taxiway . A taxiway connected to a runway at an acute angle and designed to allow landing
airplanes to turn off at higher speeds than are achieved on other exit taxiways thereby
minimizing runway occupancy times.
Taxiway intersection. A junction of two or more taxiways.
Taxiway strip. An area including a taxiway intended to protectan aircraft operating on the taxiway
and to reduce the risk of damage to an aircraft accidentally running off the taxiway.
Threshold. The beginning of that portion of the runway usablefor landing.
Touchdown zone. The portion of a runway, beyond thethreshold, where it is intended landing airplanes
first contact the runway.
Usability factor. The percentage of time during which the useof a runway or system of runways is not
restricted because of the cross-wind component.
Note – Crosswind component means the surface wind component at right angles to the
runway centre line.
