Citizendia
Your Ad Here

The world’s navigable airspace is divided into three-dimensional segments, each of which is assigned to a specific class. Airspace means the portion of the atmosphere controlled by a particular country on top of its territory and Territorial waters or more generally any specific three-dimensional Most nations adhere to the classification specified by the International Civil Aviation Organization (ICAO) and described below. The International Civil Aviation Organization ( ICAO) an agency of the United Nations, codifies the principles and techniques of international air navigation Individual nations also designate Special Use Airspace, which places further rules on air navigation for reasons of national security or safety.

Contents

ICAO definitions

On March 12, 1990, ICAO adopted the current airspace classification scheme. Events 538 - Witiges, king of the Ostrogoths ends his siege of Rome and retreats to Ravenna, leaving Year 1990 ( MCMXC) was a Common year starting on Monday (link displays the 1990 Gregorian calendar) The classes are fundamentally defined in terms of flight rules and interactions between aircraft and Air Traffic Control (ATC). Air traffic control ( ATC) is a service provided by ground-based controllers who direct Aircraft on the ground and in the air Some key concepts are:

The classifications adopted by ICAO are:

Classes A-E are referred to as controlled airspace. Controlled airspace is an aviation term used to describe Airspace in which traffic levels are such that it has been determined that Air traffic control (ATC must Classes F and G are uncontrolled airspace. Uncontrolled airspace is an aviation term to describe Airspace where an Air Traffic Control (ATC service is not deemed necessary or cannot be provided for practical

As of 2004, ICAO is considering a proposal to reduce the number of airspace classifications to three, which roughly correspond to the current classes C, E and G.

Use of airspace classes

Each national aviation authority determines how it uses the ICAO classifications in its airspace design. In some countries, the rules are modified slightly to fit the airspace rules and air traffic services that existed before the ICAO standardisation.

United States

Main article: Airspace class (United States)

The U.S. adopted a slightly modified version of the ICAO system on September 16, 1993, when regions of airspace designated according to older classifications were converted wholesale. This article describes the implementation of International Civil Aviation Organization airspace classes in the United States of America The United States of America —commonly referred to as the Events 1400 - Owain Glyndŵr is declared Prince of Wales by his followers Year 1993 ( MCMXCIII) was a Common year starting on Friday (link will display full 1993 Gregorian calendar) The exceptions are some Terminal Radar Service Areas (TRSA), which have special rules and still exist in a few places.

With some exceptions, Class A airspace is applied to all airspace between 18,000 feet (5,500 m) and Flight Level 600 (approximately 60,000 ft). A Flight Level ( FL) is a standard nominal Altitude of an Aircraft, in hundreds of Feet. Above FL600, the airspace reverts to Class E (Reference Order 7400. 9P, Subpart E). The transition altitude (see Flight level) is also consistently 18,000 feet (5,500 m). A Flight Level ( FL) is a standard nominal Altitude of an Aircraft, in hundreds of Feet. All operations in US Class A airspace must be conducted under IFR. SVFR flight in Class A airspace is prohibited.

Class B airspace is used around major airports, in a funnel shape that is designed to contain arriving and departing commercial air traffic operating under IFR, up to 10,000 feet (3,000 m) above MSL (12,000 feet above Denver, Colorado). An airport is a location where Aircraft such as airplanes, Helicopters and blimps take off and land Mean sea level (MSL is the average (mean height of the Sea, with reference to a suitable reference surface The City and County of Denver (pronounced /ˈdɛnvɚ/ is the Capital and the most populous city of Colorado, in the United States Class C airspace is used around airports and military air bases with a moderate traffic level. Class D is used for smaller airports that have a control tower. The U. S. uses a modified version of the ICAO class C and D airspace, where only radio contact with ATC rather than an ATC clearance is required for VFR operations.

Other controlled airspace is designated as Class E - this includes a large part of the lower airspace. Class E airspace exists in many forms. It can serve as a surface-based extension to Class D airspace to accommodate IFR approach/departure procedure areas. Class E airspace can be designated to have a floor of 700' AGL (above ground level) or 1,200' AGL. Class E airspace exists above Class G surface areas from 14,500' MSL (mean sea level) to 18,000 MSL. Federal airways from 1,200 AGL to 18,000 MSL within 4 miles (6 km) of the centerline of the airway is designated Class E airspace. In Aviation, an airway is a designated route in the air Airways are laid out between navigation aids such as VORs NDBs and Intersections (NDB-based Airspace at any altitude over 60,000' (the ceiling of Class A airspace) is designated Class E airspace.

The U. S. does not use ICAO Class F.

Class G airspace (Uncontrolled) is mostly used for a small layer of airspace near the ground, but there are larger areas of Class G airspace in remote regions.

Canada

Canada generally follows the United States in application of airspace with some differences. For example, Canadian class "C" airspace is procedurally equivalent to United States class "B" airspace. Additionally, the term "Class F" is used for Special Use Airspace, this includes Advisory airspace and Restricted airspace.

Germany

In Germany, Classes A and B are generally not used at all. Germany, officially the Federal Republic of Germany ( ˈbʊndəsʁepuˌbliːk ˈdɔʏtʃlant is a Country in Central Europe. Class C is used for all Airspace above Flight Level (FL) 100 (or FL 130 near the Alps). A Flight Level ( FL) is a standard nominal Altitude of an Aircraft, in hundreds of Feet. Airspace is divided into lower airspace below FL 285 and upper airspace above FL 285.

Lithuania

In Lithuania, Classes A and B are generally not used at all. Lithuania, officially the Republic of Lithuania (Lietuvos Respublika is a Country in Eastern often referred to as Northern Europe or in the Classes C and D are used in the following areas of controlled airspace of the Republic of Lithuania:

Source: Airfield Guide Lithuania, 29 SEP 2005, ENR 1.1-1

United Kingdom

Class A

Class C

All UK airspace between FL 195 and FL 660. N. b: The Upper Flight Information Region (UIR) boundary begins at FL 245

Class D

Class E

Parts of the Belfast and Scottish TMAs and a small part of the Durham Tees Valley CTR. Durham Tees Valley Airport is an Airport in North East England, located approximately 10 km (6 Miles east of Darlington, about

Class F

"Advisory Routes" (ADRs): regularly used routes similar to airways but where traffic levels are not high enough to warrant establishment of an airway.

Class G

All remaining airspace, comprising by far the largest part of the airspace below FL 195. The UK is unusual in that IFR flight in Class G airspace is relatively common and ATC units may provide an "as far as is practical" form of separation between some such flights.

A clearance is not required for VFR flights within Class E airspace, however pilots are strongly advised to contact the appropriate ATSU.

In addition the UK has a couple of special classes of airspace that do not fall within the ICAO classes:

Aerodrome Traffic Zones (ATZ) are zones around an airport with a radius of 2 nm or 2. 5 nm, extending from the surface to 2,000 ft (600 m) AAL. Aircraft within an ATZ must obey the instructions of the tower controller (if present), or must make radio contact with the Information Officer or Air/Ground radio unit on the airport before entering the zone (in the case of an uncontrolled airfield), or must obey ground signals if non-radio. [1]

Military Air Traffic Zones (MATZ) are zones from the surface to 3,000 ft (900 m) AAL set up around military air bases in class G airspace. Military aircraft treat these as if they are controlled airspace; civilian traffic is advised but not obliged to do the same.

Australia

Australia has adopted a civil airspace system based on the United States National Airspace System (NAS):

In addition, Australia has a non-standard class of airspace for use at the capital city general aviation airports, called a General Aviation Airport Procedures Zone (GAAP Zone). There are eight capital cities in Australia, all of which function at a sub-national level General aviation (abbr GA) is one of two categories of Civil aviation. A control tower provides procedural clearances for all aircraft inside the zone. Additionally, any aircraft operating within 5 nm of the zone must obtain a clearance. VFR aircraft arrive and depart using standard arrival and departure routes, while instrument arrival and departure procedures are published for IFR operations. During VMC, IFR aircraft are not provided with full IFR services. During IMC, or marginal VMC, VFR operations are restricted in order to facilitate full IFR service for IFR aircraft.

Airspace classes and VFR

Authorities use the ICAO definitions to derive additional rules for VFR cloud clearance, visibility, and equipment requirements.

For example, consider Class E airspace. An aircraft operating under VFR may not be in communication with ATC, so it is imperative that its pilot be able to see and avoid other aircraft (and vice versa). That includes IFR flights emerging from a cloud, so the VFR flight must keep a designated distance from the edges of clouds above, below, and laterally, and must maintain at least a designated visibility, to give the two aircraft time to observe and avoid each other. The low-level speed limit of 250 knots does not apply above 10,000 feet (3,000 m), so the visibility requirements are higher.

On the other hand, in Class B airspace, separation is provided by ATC to all flights. Now the VFR flight only needs to see where it is going, so visibility requirements are reduced and there is no designated minimum distance from clouds.

Similar considerations determine whether a VFR flight must use a two-way radio and/or a transponder. Radio is the transmission of signals by Modulation of electromagnetic waves with frequencies below those of visible Light. In Telecommunication, the term transponder (short-for Trans mitter-res ponder and sometimes abbreviated to XPDR XPNDR TPDR or TP has the following meanings

Special-use Airspace

Each national authority designates areas of special use airspace (SUA), primarily for reasons of national security. This is not a separate classification from the ATC-based classes; each piece of SUA is contained in one or more zones of letter-classed airspace.

SUAs range in restrictiveness, from areas where flight is always prohibited except to authorized aircraft, to areas that are not charted but are used by military for potentially hazardous operations (in this case, the onus is on the military personnel to avoid conflict). Refer to the external links for more specific details.

References

  1. ^ Godwin, Peter (1987-2004). The Air Pilot's Manual: Aviation Law And Meteorolgy. Cranfield, England: Air Pilot Publishing Ltd.  

External links

© 2009 citizendia.org; parts available under the terms of GNU Free Documentation License, from http://en.wikipedia.org
 Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic