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  2. Advanced and retracted tongue root - Wikipedia

    en.wikipedia.org/wiki/Advanced_and_retracted...

    418. In phonetics, advanced tongue root ( ATR) and retracted tongue root ( RTR) are contrasting states of the root of the tongue during the pronunciation of vowels in some languages, especially in Western and Eastern Africa, but also in Kazakh and Mongolian. ATR vs RTR was once suggested to be the basis for the distinction between tense and lax ...

  3. ATR (aircraft manufacturer) - Wikipedia

    en.wikipedia.org/wiki/ATR_(aircraft_manufacturer)

    Website. atr-aircraft .com. ATR 42, 22.67 m long. ATR 72, 27.17 m long. ATR ( French: Avions de transport régional; Italian: Aerei da Trasporto Regionale; or "Regional Transport Airplanes" in English) is a Franco - Italian aircraft manufacturer headquartered in Blagnac, France, a suburb of Toulouse. [ 4]

  4. 1951 USAF resolution test chart - Wikipedia

    en.wikipedia.org/wiki/1951_USAF_resolution_test...

    A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens. It is widely used in optical engineering laboratory work to analyze and ...

  5. ATR 72 - Wikipedia

    en.wikipedia.org/wiki/ATR_72

    ATR 52 (not built) The ATR 72 is a twin-engine turboprop, short-haul regional airliner developed and produced in France and Italy by aircraft manufacturer ATR . The number "72" in its name is derived from the aircraft's typical standard seating capacity of 72 passengers. The ATR 72 has also been used as a corporate transport, cargo aircraft ...

  6. ATR 42 - Wikipedia

    en.wikipedia.org/wiki/ATR_42

    A HOP! ATR 42-500 on final approach. The ATR 42 is a regional airliner produced by Franco-Italian manufacturer ATR, with final assembly in Toulouse, France. On 4 November 1981, the aircraft was launched with ATR, as a joint venture between French Aérospatiale (now part of Airbus) and Aeritalia (now Leonardo S.p.A. ).

  7. Line-replaceable unit - Wikipedia

    en.wikipedia.org/wiki/Line-replaceable_unit

    Line-replaceable unit. A line-replaceable unit ( LRU [1] ), lower line-replaceable unit ( LLRU ), [citation needed] line-replaceable component ( LRC ), or line-replaceable item ( LRI) [2] is a modular component of an airplane, [3] ship or spacecraft [4] (or any other manufactured device) that is designed to be replaced quickly at an operating ...

  8. Attenuated total reflectance - Wikipedia

    en.wikipedia.org/wiki/Attenuated_total_reflectance

    Attenuated total reflectance. Attenuated total reflection ( ATR) is a sampling technique used in conjunction with infrared spectroscopy which enables samples to be examined directly in the solid or liquid state without further preparation. [1] Light undergoes multiple internal reflections in the crystal of high refractive index, shown in yellow.

  9. List of aircraft type designators - Wikipedia

    en.wikipedia.org/wiki/List_of_aircraft_type...

    List of aircraft type designators. An aircraft type designator is a two-, three- or four-character alphanumeric code designating every aircraft type (and some sub-types) that may appear in flight planning. These codes are defined by both the International Civil Aviation Organization (ICAO) and the International Air Transport Association (IATA).

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