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  2. Signal square - Wikipedia

    en.wikipedia.org/wiki/Signal_square

    The same documents include the H sign indicating a landing area for helicopters, commonly used on a helipad (but not a circle around the letter H), to be displayed in the Signals Area. [ 5 ] [ 4 ] According to the UK Civil Aviation Authority , these visual aids can be used at aerodromes with a significant amount of general aviation movements.

  3. Airport diagram - Wikipedia

    en.wikipedia.org/wiki/Airport_diagram

    According to ICAO, airport diagrams shall show coordinates, field elevations, runways, aprons, taxiways, hot spots, taxiway routes, air transit routes, lighting, air traffic control (ATC) service boundary, communication channels, obstacles, slope angles, buildings and service areas, VOR checkpoints, and movement area permanently unsuitable for aircraft.

  4. Aeronautical chart conventions (United States) - Wikipedia

    en.wikipedia.org/wiki/Aeronautical_chart...

    White space around the chart is filled with map information and the legend, scales, and tables of airport and airspace information. Terrain is color-coded for its elevation and major roads, cities, and bodies of water are shown for visual reference, as well as other identifiable structures (e.g., stadiums and water towers ).

  5. Runway - Wikipedia

    en.wikipedia.org/wiki/Runway

    There are standards for runway markings. [22] The runway thresholds are markings across the runway that denote the beginning and end of the designated space for landing and takeoff under non-emergency conditions. [23] The runway safety area is the cleared, smoothed and graded area around the paved runway. It is kept free from any obstacles that ...

  6. Critical area (aeronautics) - Wikipedia

    en.wikipedia.org/wiki/Critical_area_(aeronautics)

    Sign placed at edge of ILS critical area (often next to pavement markings) Localizer critical area – aircraft/vehicles/persons or physical obstructions are not authorized in or over the critical area when an arriving aircraft is between the ILS final approach fix and the airport.

  7. U.S. Navy and U.S. Marine Corps aircraft tail codes - Wikipedia

    en.wikipedia.org/wiki/U.S._Navy_and_U.S._Marine...

    Tail codes on the U.S. Navy aircraft are the markings that help to identify the aircraft's unit and/or base assignment. These codes comprise one or two letters or digits painted on both sides of the vertical stabilizer, on the top right and on the bottom left wings near the tip.

  8. Airfield traffic pattern - Wikipedia

    en.wikipedia.org/wiki/Airfield_traffic_pattern

    In Canada, aircraft at uncontrolled airports usually cross the airport at midfield at pattern altitude from the upwind side, turning onto the downwind leg. Although joining straight in downwind is also a possibility. [6] At controlled airports, the tower typically directs aircraft to join the downwind leg, base leg, or straight into the final ...

  9. Displaced threshold - Wikipedia

    en.wikipedia.org/wiki/Displaced_threshold

    Runway 29L at Indira Gandhi International Airport, in Delhi, India, has a displaced threshold of 1,460 m (4,790 ft) from the physical beginning of the pavement. [4] This produces a 1.5 km portion of runway that cannot be used for landing in this direction. This, in turn decreases the available landing length on runway 29L to 2,970 m (9,744 ft).