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    Introduction

    An airport is a location whereaircraft such asfixed-wing aircraft,helicopters,andblimps take off

    and land. Aircraft may be stored or maintained at an airport. An airport consists of at least one

    surface such as arunway for a plane to take off and land, ahelipad, or waterfortakeoffs andlandings, and often includes buildings such ascontrol towers,hangars and

    terminal buildings.

    Larger airports may havefixed base operator services,seaplane docks andramps,air traffic

    control, passenger facilities such as restaurants andlounges, andemergency services.

    Amilitary airport is known as anairbase orair station.

    History

    The earliest aircraft takeoff and landing sites were grassy fields. The plane could approach at any

    angle that provided a favorable wind direction. A slight improvement was the dirt-only field,

    which eliminated the drag from grass. However, these only functioned well in dry conditions.

    Later, concrete surfaces would allow landings, rain or shine, day or night.

    FollowingWorld War II, airport design became more sophisticated. Passenger buildings were

    being grouped together in an island, with runways arranged in groups about the terminal. This

    arrangement permitted expansion of the facilities. But it also meant that passengers had to

    travel further to reach their plane.

    An improvement in the landing field was the introduction of grooves in the concrete surface.

    These run perpendicular to the direction of the landing aircraft and serve to draw off excess

    water in rainy conditions that could build up in front of the plane's wheels.

    Airport construction boomed during the 1960s with the increase injet aircraft traffic. Runways

    were extended out to 3,000 m (9,800 ft). The fields were constructed out ofreinforced

    concrete using a slip-form machine that produces a continual slab with no disruptions along the

    length. The early 1960s also saw the introduction of jet bridge systems to modern airport

    terminals, an innovation which eliminated outdoor passenger boarding. These systems became

    commonplace in the United States by the 1970s.

    Definition of Terms

    Airport - A tract of leveled land where aircraft can take off and land, usually equipped

    with hard-surfaced landing strips, a control tower, hangars, aircraft maintenance and

    refueling facilities, and accommodations for passengers and cargo.

    http://en.wikipedia.org/wiki/Aircrafthttp://en.wikipedia.org/wiki/Fixed-wing_aircrafthttp://en.wikipedia.org/wiki/Helicopterhttp://en.wikipedia.org/wiki/Blimphttp://en.wikipedia.org/wiki/Runwayhttp://en.wikipedia.org/wiki/Helipadhttp://en.wikipedia.org/wiki/Takeoffhttp://en.wikipedia.org/wiki/Landinghttp://en.wikipedia.org/wiki/Control_towerhttp://en.wikipedia.org/wiki/Hangarhttp://en.wikipedia.org/wiki/Airport_terminalhttp://en.wikipedia.org/wiki/Fixed_base_operatorhttp://en.wikipedia.org/wiki/Seaplanehttp://en.wikipedia.org/wiki/Airport_ramphttp://en.wikipedia.org/wiki/Air_traffic_controlhttp://en.wikipedia.org/wiki/Air_traffic_controlhttp://en.wikipedia.org/wiki/Airport_loungehttp://en.wikipedia.org/wiki/Emergency_servicehttp://en.wikipedia.org/wiki/Militaryhttp://en.wikipedia.org/wiki/Military_airbasehttp://en.wikipedia.org/wiki/Naval_air_stationhttp://en.wikipedia.org/wiki/World_War_IIhttp://en.wikipedia.org/wiki/Jet_aircrafthttp://en.wikipedia.org/wiki/Reinforced_concretehttp://en.wikipedia.org/wiki/Reinforced_concretehttp://en.wikipedia.org/wiki/Reinforced_concretehttp://en.wikipedia.org/wiki/Reinforced_concretehttp://en.wikipedia.org/wiki/Jet_aircrafthttp://en.wikipedia.org/wiki/World_War_IIhttp://en.wikipedia.org/wiki/Naval_air_stationhttp://en.wikipedia.org/wiki/Military_airbasehttp://en.wikipedia.org/wiki/Militaryhttp://en.wikipedia.org/wiki/Emergency_servicehttp://en.wikipedia.org/wiki/Airport_loungehttp://en.wikipedia.org/wiki/Air_traffic_controlhttp://en.wikipedia.org/wiki/Air_traffic_controlhttp://en.wikipedia.org/wiki/Airport_ramphttp://en.wikipedia.org/wiki/Seaplanehttp://en.wikipedia.org/wiki/Fixed_base_operatorhttp://en.wikipedia.org/wiki/Airport_terminalhttp://en.wikipedia.org/wiki/Hangarhttp://en.wikipedia.org/wiki/Control_towerhttp://en.wikipedia.org/wiki/Landinghttp://en.wikipedia.org/wiki/Takeoffhttp://en.wikipedia.org/wiki/Helipadhttp://en.wikipedia.org/wiki/Runwayhttp://en.wikipedia.org/wiki/Blimphttp://en.wikipedia.org/wiki/Helicopterhttp://en.wikipedia.org/wiki/Fixed-wing_aircrafthttp://en.wikipedia.org/wiki/Aircraft
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    Airport Hangar - Is a closed structure to holdaircraft orspacecraft in protective storage.

    Most hangars are built of metal, but other materials such as wood and concrete are also

    used.

    Airport Terminal - A building at anairport where passengers transfer between ground

    transportation and the facilities that allow them to board and disembark fromaircraft. Arrival - Terminal where the incoming passengers land from the aircraft.

    Departure Terminal where the passengers depart for flights.

    Gate - A gate inaviation is a long, movable, "bridge" that allows passengers to embark

    and disembark their aircraft.

    Helipad - Landing site for a helicopter which are generally built away from large

    structures, which could pose a hazard to the landing helicopters. They may also be built

    on the roofs of large office buildings, or even on the decks of ships. Helipads typically

    consists of a hard, level surface, - often featuring a large 'H' painted in white, or a

    number indicating the maximum weight that the helipad can safely support.

    Heliport - A small-scale airport designed for helicopters. A heliport typically consists of

    one or more helipads, with support facilities ranging from fuel to landing lights, and

    occasionally aircraft hangars.

    Jet Bridge - A jet bridge (also termed jetway, loading bridge, aerobridge / airbridge, air

    jetty, portal, passenger walkway or passenger boarding bridge) is an enclosed,movable

    connector which extends from anairport terminalgate to anairplane, allowing

    passengers to board and disembark without going outside. Depending on building

    design, sill heights, fueling positions and operational requirements, it may be fixed

    ormovable,swinging radially or extending in length.

    Airport: Planning Components

    The term airport can include not only the civil airports familiar to holidaymakers but also

    airfields (which may have few or no associated buildings) and heliport. They may be devided

    into those which are public (i.e. accessible to any air travelers) and those which are private

    e.g. air freight terminals, company airports, and aero clubs and air force bases).

    Location

    The choice of location for an airport will depend on topographical, geological and

    meteorological conditions as well as the position of surrounding built-up areas. Sufficient

    land must be available for take-off and landing runways, storage, etc. and, ideally, for

    possible future expansion. Another important factor is proximity to existing and potential

    transport networks.

    http://en.wikipedia.org/wiki/Aircrafthttp://en.wikipedia.org/wiki/Spacecrafthttp://en.wikipedia.org/wiki/Airporthttp://en.wikipedia.org/wiki/Fixed-wing_aircrafthttp://en.wikipedia.org/wiki/Aviationhttp://en.wikipedia.org/wiki/Moveable_bridgehttp://en.wikipedia.org/wiki/Moveable_bridgehttp://en.wikipedia.org/wiki/Airport_terminalhttp://en.wikipedia.org/wiki/Gate_(airport)http://en.wikipedia.org/wiki/Airplanehttp://en.wikipedia.org/wiki/Movable_bridgehttp://en.wikipedia.org/wiki/Movable_bridgehttp://en.wikipedia.org/wiki/Airplanehttp://en.wikipedia.org/wiki/Gate_(airport)http://en.wikipedia.org/wiki/Airport_terminalhttp://en.wikipedia.org/wiki/Moveable_bridgehttp://en.wikipedia.org/wiki/Moveable_bridgehttp://en.wikipedia.org/wiki/Aviationhttp://en.wikipedia.org/wiki/Fixed-wing_aircrafthttp://en.wikipedia.org/wiki/Airporthttp://en.wikipedia.org/wiki/Spacecrafthttp://en.wikipedia.org/wiki/Aircraft
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    General Expansion Plan

    For all airports, an expansion plan covering at least 20 years ahead should be drawn up, and

    revised at regular intervals in order to allow for changes in the volume and nature of air

    traffic, developments in aircraft technology and other innovations.

    Traffic forecasts should include information about movements of aircraft, numbers of

    passengers and volume of freight. They should be checked and updated on a regular basis

    to account for the pace of modern-change. For the calculations, and the design of the

    airport facilities and installations, typical peak traffic values (i.e. those reached 30 times per

    year or 10 times within the peak month) should be chosen, not the absolute peak values.

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    Forward planning requires a traffic forecast based on the following data:

    Average/peak passenger movements (overseas/domestic, arrivals/departures,

    transfers/transits, short-haul/long-haul);

    Average/peak air-freight/mail take-offs and landing (overseas/domestic,

    import/export/transfer), proportions of standard dimensions (containers, pallets)

    average/peak total tonnage, number of items or volume of goods;

    Average/peak movements of aircraft according to types of aircraft (passenger, freight

    or mixed traffic).

    Other factors important to planning are:

    Choice of mode of transport by passengers (private car, taxi, public transport);

    Average number of people accompanying each passenger. Average number of pieces of

    luggage per passenger, number of visitors to airport (unconnected to passengers/

    employees).

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    Airport Terminals

    The following functional areas determine the airport capacity:

    Take-off and landing runway systems (possible movements of aircraft per unit time);

    Taxiways and number of arrival/departure gates;

    Passenger terminal buildings (possible movements of passengers, baggage and

    airfreight per unit time).

    The capacity of the check system is determined by:

    The related road and rail systems (including parking provisions, capacity of roads);

    Passenger/baggage check-in clearance (number of counters and capacity of conveyor or

    transport system);

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    Passport control, security checks, checks prior to boarding the plane (size of waiting

    rooms, number of counters).

    The apron is the area that connects runways to the terminal. It includes taxiways, aircraft

    maneuvering/parking areas, associated traffic areas and roads for service vehicles, as well as

    storage areas for service vehicles and equipment, and should therefore be developed in

    conjunction with the terminal.

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    Passenger Terminal Concepts

    Airports use different methods of accommodating aircraft and linking them with the terminalsand the main buildings. There are four main concepts:

    Pier Concept (with central main terminal) aircraft park on both sides of a pier

    connected to the terminal building. Where there are two or more piers, the space in

    between has to be sufficient for 1-2 apron taxiways each (allowing taxiing in and out at

    the same time).

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    Satellite Concept (with central main terminal) one or more buildings, each surrounded

    radially with aircraft parking places, are connected to the main terminal, generally by

    large underground corridors.

    Linear Concept aircraft are parked alongside the terminal building in a line next to one

    another in nose-in, parallel or diagonal positions. The parking position determines to agreat extent the overall length of the terminal.

    Transporter Concept aircraft parking is spatially separated from the terminal and the

    passengers are taken to and from their flights by specially, designed transport vehicles.

    Further mixed variations (hybrid concept) can be developed from these basic concepts.

    Runways and Aprons

    The orientations, lengths and numbers of take-off and landing runways are determined by a

    number of factors:

    Orientation is determined essentially by the prevailing local wind direction, the aim being

    to make it possible to approach the airport for 95% of the year (with a maximum side

    wind of 20 knots). Frequent strong crosswinds may make a corresponding second

    runway necessary.

    Length is determined by the type of aircraft, predominant climatic and topographic

    conditions, such as temperature, air pressure (related to height above sea level), land

    gradient, etc.

    The number of runways is dependent upon the volume of traffic to be handled. A parallel

    arrangement (note that the minimum separation is 215m) is particularly advantageous

    and, if the separation is more than 1310m, simultaneous take-offs and landings are

    possible, which allow the highest theoretical capacity to be reached.

    The taxiing area is to be designed in such a way that the runways can be cleared as fast as

    possible after the landing (fast exit taxiing runways) and parking positions can be reached by

    the shortest possible routes. In specially busy airports, provisions of overtaking areas or by pass

    runways can help to increase capacity.

    Aircraft Parking Positions

    The nose-in position has the following advantages: small space requirements; few problems with

    exhaust streams for personnel, buildings and equipments; quick servicing times as the necessary

    equipment can be made available before arrival; and ease of connection to passenger bridges.

    However, this position requires a means of towing for maneuvering purposes and this add time

    and calls for trained personnel.

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    With taxi in/taxi out parking (e.g. diagonal nose-in and diagonal nose-out), towing is not

    necessary. However, such parking needs a larger space and creates more fumes and noise

    pollution directly in the vicinity of the terminal as the aircraft is taxiing, thus making it necessary

    to add protective measures such as blast barriers.

    The parallel parking system offers the easiest maneuvering for arriving and departing aircraft

    and there is no need for towing. The disadvantages are that parallel parking has the greatest

    overall space requirement and limits activity in neighboring aircraft positions during taxiing.

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    Apron Roadways and Parking Spaces

    Signposting and positioning of service roadways on the apron are of great importance to the

    efficient and safe functioning of the airport. Apron roadways should be designed to give direct

    and safe connection of the apron to the other working areas of the airport. The points at which

    they cross aircrafts taxiways or other service vehicle routes should be kept to the minimum. They

    can be run in front of or behind planes in the nose-in position, or between the wings.

    Should the roadways run underneath passengers bridges, sufficient headroom for all service

    vehicles is required (usually 4.50 m minimum). Because of the extensive mechanization and

    containerization of aircraft servicing, it is vital to provide enough space for loading and parking

    of service vehicles and equipment (including empty containers).

    Terminals essentially facilitate the transfer of passengers from ground transport (public

    transport, taxis, and private cars) to the aircraft. They must therefore be planned in such a way

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    that the movement of passengers and their luggage takes place efficiently, comfortably and

    quickly, and at the same time with the lowest possible running cost. An important criterion is

    passenger travelling distance: the distances between the car park/drop-off point and the main

    functional areas should be kept as short as possible. Modification to accommodate any

    increases in traffic must also be possible without radical and costly alterations to the originalterminal.