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The Pratt & Whitney JT8D is a low-bypass (0.96 to 1) turbofan engine introduced by Pratt & Whitney in February 1963 with the inaugural flight of the Boeing 727.It was a modification of the Pratt & Whitney J52 turbojet engine which powered the US Navy A-6 Intruder and A-4 Skyhawk attack aircraft.
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.
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]
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.
Usually the flow is from the tank to the pump inlet and PRV, pumped to main oil filter or its bypass valve and oil cooler, then through some more filters to jets in the bearings. 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 ...
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.
Due to technical problems, a forced landing was carried out at Abadan, Iran. About two weeks later, repairs had been accomplished, and the aircraft took off. Shortly after takeoff, an oil leak was observed on engine number one. While on finals for landing at Abadan, the aircraft suddenly lost height and crashed, killing all aboard.
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 ...
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