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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 A320 engine, the PW1100G, had made its first static engine test run on November 1, 2012, [20] and was first tested on the 747SP on May 15, 2013. [21] The first flight of the Airbus A320neo followed on September 25, 2014. [22] The PW1100G engine achieved FAA type certification on December 19, 2014. [23]
Research into the next generation of commercial jet engines, high-bypass ratio turbofans in the "10-ton" (20,000 lbf; 89 kN) thrust class, began in the late 1960s. Snecma (now Safran), who had mostly built military engines previously, was the first company to seek entrance into the market by searching for a partner with commercial experience to design and build an engine in this class.
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Diagram of a typical gas turbine jet engine. Air is compressed by the compressor blades as it enters the engine, and it is mixed and burned with fuel in the combustion section. The hot exhaust gases provide forward thrust and turn the turbines which drive the compressor blades.
The same engine ultimately reached 35,000 lbf (160 kN) of thrust in test runs. [6] The LEAP-1A was tested on GE's 747-400 flying test platform. [18] CFM carried out the first test flight of a LEAP-1C in Victorville, California, with the engine mounted on the company's Boeing 747 flying testbed aircraft on 6 October 2014. The -1C version ...
The first flight with one of these engines took place on 22 February 2007, using a Boeing 747-100, fitted with one GEnx engine in the number 2 (inboard left hand side) position. By fall 2019, General Electric was offering the GEnx-2B, developed for the 747-8, for the revised 767-XF variant based on the 767-400ER, but needed enough volume to ...
The engine performance deteriorates with use as parts wear, meaning the engine has to use more fuel to get the required thrust. A new engine starts with a reserve of performance which is gradually eroded. The reserve is known as its temperature margin and is seen by a pilot as the EGT margin. For a new CFM International CFM56-3 the margin is 53 ...