AERODROME - PART 1

khoatd 8/8/2008, 15:40

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 appropriate

authority under applicable regulations for the operation of

an aerodrome.

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.

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.

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.

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.

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 an

aid to air navigation, other than a light displayed on an

aircraft.

Aeroplane reference field length. The minimum field length

required 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

aeroplane flight manual prescribed by the certificating

authority or equivalent data from the aeroplane manufacturer.

Field length means balanced field length for

aeroplanes, 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 expressing

the 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 aftmost

CG position appropriate to the maximum gross apron (ramp)

mass is used to calculate the ACN. In exceptional cases the

forwardmost CG position may result in the nose gear loading

being more critical.

Aircraft stand. A designated area on an apron intended to be

used 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 regulate

the 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.

Capacitor discharge light. A lamp in which high-intensity

flashes 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 been

granted an aerodrome certificate.

Clearway. A defined rectangular area on the ground or water

under the control of the appropriate authority, selected or

prepared as a suitable area over which an aeroplane may

make a portion of its initial climb to a specified height.

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 meet the requirements of the data user in terms of

accuracy, resolution and integrity.

De-icing/anti-icing facility. A facility where frost, ice or snow

is removed (de-icing) from the aeroplane to provide clean

surfaces, and/or where clean surfaces of the aeroplane

receive protection (anti-icing) against the formation of frost

or ice and accumulation of snow or slush for a limited

period of time.

Note.— Further guidance is given in the Manual of Aircraft

Ground De-icing/Anti-icing Operations (Doc 9640).

De-icing/anti-icing pad. An area comprising an inner area for

the parking of an aeroplane to receive de-icing/anti-icing

treatment and an outer area for the manoeuvring of two or

more mobile de-icing/anti-icing equipment.

Declared distances.

a) Take-off run available (TORA). The length of runway

declared available and suitable for the ground run of an

aeroplane taking off.

b) Take-off distance available (TODA). The length of the

take-off run available plus the length of the clearway, if

provided.

c) Accelerate-stop distance available (ASDA). The length

of the take-off run available plus the length of the

stopway, if provided.

d) Landing distance available (LDA). The length of

runway which is declared available and suitable for the

ground run of an aeroplane landing.

Dependent parallel approaches. Simultaneous approaches to

parallel or near-parallel instrument runways where radar

separation minima between aircraft on adjacent extended

runway centre lines are prescribed.

Displaced threshold. A threshold not located at the extremity

of a runway.

Effective intensity. The effective intensity of a flashing light is

equal to the intensity of a fixed light of the same colour

which will produce the same visual range under identical

conditions of observation.

Ellipsoid height (Geodetic height). The height related to the

reference ellipsoid, measured along the ellipsoidal outer

normal through the point in question.

Fixed light. A light having constant luminous intensity when

observed 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 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.