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  2. Pratt & Whitney JT8D - Wikipedia

    en.wikipedia.org/wiki/Pratt_&_Whitney_JT8D

    The JT8D is an axial-flow front turbofan engine incorporating a two-spool design. There are two coaxially-mounted independent rotating assemblies: one rotating assembly for the low pressure compressor (LPC) which consists of the first six stages (i.e. six pairs of rotating and stator blades, including the first two stages which are for the bypass turbofan), driven by the second (downstream ...

  3. McDonnell Douglas MD-80 - Wikipedia

    en.wikipedia.org/wiki/McDonnell_Douglas_MD-80

    American Airlines was the first US major carrier to order the MD-80 when it leased twenty 142-seat aircraft from McDonnell Douglas in October 1982 to replace its Boeing 727-100s. It committed to 67 firm orders plus 100 options in March 1984, and in 2002 its fleet peaked at more than 360 aircraft, 30% of the 1,191 produced.

  4. Boeing 727 - Wikipedia

    en.wikipedia.org/wiki/Boeing_727

    The 727 is equipped with a retractable tailskid that is designed to protect the aircraft in the event of an over-rotation on takeoff. The 727's fuselage has an outer diameter of 148 inches (3.8 m). This allows six-abreast seating (three per side) and a single aisle when 18-inch (46 cm) wide coach-class seats are installed.

  5. USA Jet Airlines - Wikipedia

    en.wikipedia.org/wiki/USA_Jet_Airlines

    In August 2013, USA Jet Airlines became the world's first operator of an MD-80 Passenger-to-Freighter conversion. The aircraft, converted by Aeronautical Engineers, Inc., competes against the Boeing 727 in the cargo market. [5] In February 2023, USA Jet retired the last three of their McDonnell Douglas DC-9 fleet. [citation needed]

  6. Propfan - Wikipedia

    en.wikipedia.org/wiki/Propfan

    Propulsive efficiency comparison for various gas turbine engine configurations. In the 1970s, Hamilton Standard described its propfan as "a small diameter, highly loaded multiple bladed variable pitch propulsor having swept blades with thin advanced airfoil sections, integrated with a nacelle contoured to retard the airflow through the blades thereby reducing compressibility losses and ...

  7. Components of jet engines - Wikipedia

    en.wikipedia.org/wiki/Components_of_jet_engines

    Using the PRV method of control, means that the pressure of the feed oil must be below a critical value (usually controlled by other valves which can leak out excess oil back to tank if it exceeds the critical value). The valve opens at a certain pressure and oil is kept moving at a constant rate into the bearing chamber.

  8. Boeing 7J7 - Wikipedia

    en.wikipedia.org/wiki/Boeing_7J7

    It would have carried 150 passengers and was touted as the successor to the successful Boeing 727. [1] It was initially planned to enter service in 1992. [1] This was intended as a highly fuel-efficient aircraft employing new technologies, but it was postponed indefinitely as the price of oil dropped during the 1980s.

  9. McDonnell Douglas DC-9 - Wikipedia

    en.wikipedia.org/wiki/McDonnell_Douglas_DC-9

    The MD-80 series was further developed into the third generation, the MD-90 series, in the early 1990s. It has yet another fuselage stretch, an electronic flight instrument system (first introduced on the MD-88), and completely new International Aero V2500 high-bypass turbofan engines. In comparison to the very successful MD-80, relatively few ...