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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.
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 ...
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.
The MD-90 was a stretched version of the MD-80, [48] powered by International Aero Engines V2500 turbofans, the largest rear-mounted engines ever used on a commercial jet. The MD-95 , a modern regional airliner closely resembling the DC-9-30, was the last McDonnell Douglas designed commercial jet to be produced.
Two approaches were considered: a stretched 727 (to be designated 727-300), and an all-new aircraft code-named 7N7. [7] The former was a cheaper derivative using the 727's existing technology and tail-mounted engine configuration, [ 7 ] while the latter was a twin-engine aircraft which made use of new materials and improvements to propulsion ...
Enjoy a classic game of Hearts and watch out for the Queen of Spades!
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.
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.