The GE 90 is the worlds most powerful aircraft jet engine and it is all made in the USA this new jet engine means cheep flights and could lead to bigger US military transport aircraft. The General Electric GE90 is a family of high-bypass turbofan aircraft engines built by GE Aviation for the Boeing 777, with thrust ratings ranging from 74,000 to 115,000 lbf (330 to 510 kN). It entered service in November 1995. Currently the world’s largest turbofan engine, it is one of three options for the 777-200, -200ER, and -300, and the exclusive engine of the -200LR, -300ER, and 777F.
Design and development
The GE90 was launched in 1990. GE Aviation is associated with Snecma (France), IHI (Japan) and Avio (Italy). Developed from the 1970s NASA Energy Efficient Engine, the 10-stage high pressure compressor develops a pressure ratio of 23:1 (an industry record) and is driven by a 2-stage, air-cooled, HP turbine. A 3-stage intermediate pressure compressor, situated directly behind the fan, supercharges the core. The fan/IPC is driven by a 6-stage low pressure turbine.
The higher-thrust GE90-115B mounted on GE's Boeing 747 aircraft during a flight test campaign.
The higher-thrust variants, GE90-110B1 and -115B, have a different architecture from the earlier marks of GE90, with one stage removed from the HP compressor (probably from the rear, to increase core size), with an extra stage added to the IP compressor to maintain/increase overall pressure ratio to achieve a net increase in core flow. General Electric performed a similar re-staging exercise when they upgraded the CF6 from the -6 to the higher thrust -50. However, this thrust growth route is expensive, since all the downstream components (e.g. turbines) must be larger (in flow capacity). As a result GE sought (and received) sole engine supplier status with the -115B on the Boeing 777-300ER. The fan is an advanced, larger diameter unit made from composite materials and is the first production engine to feature swept rotor blades. Although the larger fan in itself would produce a higher static thrust, an increase in core size and, thereby core power, was required to improve the net thrust at normal flight speeds.
The GE90-115B is powerful enough to fully operate GE's Boeing 747 testbed on its own power demonstrated during a flight test.
In October 2003, a Boeing 777-300ER broke the ETOPS record by being able to fly five and a half hours (330 minutes) with one engine shut down. The aircraft, with GE90-115B engines, flew from Seattle to Taiwan as part of the ETOPS certification programme.
According to the Guinness Book of Records, at 127,900 pounds-force (569 kN)f, the engine holds the record for the highest thrust (although rated at 115,300 pounds-force (513 kN)f). This thrust record was accomplished inadvertently as part of a one-hour, triple-red-line engine stress test. In order to accommodate the increase in torsional stresses an entirely new steel alloy (GE1014) had to be created and then machined to extreme tolerances. The new record was set during testing of a GE90-115B development engine at GE Aviations' Peebles Test Operation, which is an outdoor test complex outside Peebles, Ohio. It eclipsed the engine's previous Guinness world record of 122,965 pounds-force (546.98 kN).
On November 10, 2005, the GE90 entered the Guinness World Records for a second time. The GE90-110B1 powered a 777-200LR during the world's longest flight by a commercial airliner, though there were no fare-paying passengers on the flight, only journalists and invited guests. The 777-200LR flew 13,422 miles (21,601 km) in 22 hours, 42 minutes, flying from Hong Kong to London "the long way": over the Pacific, over the continental U.S., then over the Atlantic to London.
The first General Electric-powered Boeing 777 was delivered to British Airways on November 12, 1995; the aircraft, with two GE90-77Bs, entered service five days later. Initial service was affected by gearbox bearing wear issues, which caused the airline to temporarily withdraw its 777 fleet from transatlantic service in 1997. British Airways' aircraft returned to full service later that year, and General Electric subsequently announced engine upgrades.
Due to the expense of producing the higher-thrust GE-90 variants, the GE90-115B is the sole engine available on the Boeing 777-300ER. The ultra-long range Boeing 777-200LR is normally fitted with the GE90-110B1 but can also take the -115B. The GE90-equipped Boeing 777s have been the best-selling long-range large wide-body aircraft in the 2000s at the expense of the Airbus A340.
The GE90 series are physically the largest engines in aviation history, the fan diameter of the original series being 312 cm (123 in). The largest variant, the GE90-115B, has a fan diameter of 325 cm (128 in). As a result, GE90 engines can only be airfreighted in assembled form by outsize cargo aircraft such as the