"In the 1990s, Australia began forming a need for an airborne early warning and control (AEW&C) aircraft. In 1996, Australia issued a request for proposal (RFP) for the aircraft for the RAAF under ""Project Wedgetail"". In 1999, Australia awarded Boeing Integrated Defense Systems a contract to supply four AEW&C aircraft with options for three additional aircraft. The 737 AEW&C is based on the Boeing 737 Next Generation design, roughly similar to the 737-700ER. The aircraft uses the Northrop Grumman Electronic Systems Multi-role Electronically Scanned Array (MESA) radar. The L-band (1 to 2 GHz) electronically scanned AEW and surveillance radar is"
"subsequent crash. There were no passenger casualties of the 300 people on board, however one airport fireman was killed fighting the fire. The aircraft's fuselage and right wing were badly damaged by the fire. Boeing 777 The Boeing 777 (""Triple Seven"") is a long-range wide-body twin-engine jet airliner developed and manufactured by Boeing Commercial Airplanes. It is the world's largest twinjet and has a typical seating capacity of 314 to 396 passengers, with a range of . Commonly referred to as the ""Triple Seven"", its distinguishing features include the large–diameter turbofan engines, long raked wings, six wheels on each main"
"Boeing 777 The Boeing 777 (""Triple Seven"") is a long-range wide-body twin-engine jet airliner developed and manufactured by Boeing Commercial Airplanes. It is the world's largest twinjet and has a typical seating capacity of 314 to 396 passengers, with a range of . Commonly referred to as the ""Triple Seven"", its distinguishing features include the large–diameter turbofan engines, long raked wings, six wheels on each main landing gear, fully circular fuselage cross-section, and a blade-shaped tail cone. Developed in consultation with eight major airlines, the 777 was designed to replace older wide-body airliners and bridge the capacity difference between Boeing's"
"significance of this advantage. During a single engine failure, the amount of power lost for quadjets is proportionately lower than trijets (aircraft with three jet engines) and twinjets (aircraft with two jet engines) . This is because a quadjet will still have three of its four engines functioning, constituting a 25% reduction in thrust, compared to 33% for trijets and 50% for twinjets. This can be observed in the following example involving the Boeing 747-400 quadjet, McDonell Douglas MD-11 trijet and Boeing 767-300ER twinjet. With all engines operative at maximum takeoff weight, all three aircraft have power to weight ratios"
"airlines – with deliveries scheduled through 2022. The Boeing 747 is a large, wide-body (two-aisle) airliner with four wing-mounted engines. Its wings have a high sweep angle of 37.5 degrees for a fast, efficient cruise of Mach 0.84 to 0.88, depending on the variant. The sweep also reduces the wingspan, allowing the 747 to use existing hangars. Its seating capacity is over 366 with a 3–4–3 seat arrangement (a cross section of 3 seats, an aisle, 4 seats, another aisle, and 3 seats) in economy class and a 2–3–2 layout in first class on the main deck. The upper deck"
"of approximately 1 to 3.4. Following the failure of one engine, the power to weight ratio drops to 1 to 4.7 (747-400), 1 to 5.5 (MD-11) and 1 to 6.6 (767-300ER). The Boeing 747-400 experiences the least degradation in performance, making it safer during an engine failure. Fitting an aircraft with four engines also increases power, enabling more passengers, heavier payloads and increased performance. This was especially important for early jet airliners, as jet engines at the time produced less thrust. The Pratt & Whitney JT3D from 1958 had a thrust output of 75,616 N (17,000 lb), while modern engines"
"to prove too little too late, making a last-minute landing abort and fly-around difficult and dangerous. The number of engines on an aircraft affects its reliability and safety. The more engines there are, the safer it is if one engine fails. But on the other hand, the more engines there are, the more likely there is to be a failure of one or more and the greater the workload on the flight engineer. Nowadays, two engines are preferred in practice, with even quite large wide-body aircraft having only two engines. Four is generally accepted as the limit, for both safety"
"twinjets include the 767, 757 (out of production but still in commercial service) and 787. Competitor Airbus produces the A320 family, the A330, and the A350. Some modern commercial airplanes still use four engines (quad-jets) like the Airbus A380 and Boeing 747-8, which are classified as very large aircraft (over 400 seats in mixed-class configurations). Four engines are still used on the largest cargo aircraft capable of transporting outsize cargo, including strategic airlifters. There are plans to revive production of six-engine giants like the Antonov An-225 Mriya. Twin-jets tend to be more fuel-efficient than trijet (three engine) and quad-jet (four"
"than the engine core itself, which is typically a modern, high efficiency two or three-spool design. This high efficiency and power is what allows such large fans to be viable, and the increased thrust available (up to 75,000lbs per engine in engines such as the Rolls-Royce Trent XWB or General Electric GENx), have allowed a move to large twin engine aircraft, such as the Airbus A350 or Boeing 777, as well as allowing twin engine aircraft to operate on long overwater routes, previously the domain of 3-engine or 4-engine aircraft. Jet engines were designed to power aircraft, but have been"
"and fuel costs compared to a twinjet. The vast majority of wide-body aircraft designs today have two engines, although the heaviest wide-body aircraft are built with four engines (the Airbus A380, Boeing 747 and Airbus A340). However, the upcoming Boeing 777X (""mini jumbo jet"") twinjet (777-9 variant) is approaching the capacity of the Boeing 747 while the proposed Boeing 777–10 stretch could challenge the Airbus A380. The Boeing 777 twinjet features the largest and most powerful jet engine in the world, the General Electric GE90, which is in diameter. This is almost as wide as the entire fuselage of a"
"dump system to the later, larger variants would have incurred a large weight penalty. Boeing instead demonstrated an ""equivalent level of safety"". Depending upon the nature of the emergency, 737s either circle to burn off fuel or land overweight. If the latter is the case, the aircraft is inspected by maintenance personnel for damage and then returned to service if none is found. Engines on the 737 Classic series (−300, −400, −500) and Next-Generation series (−600, −700, −800, −900) do not have circular inlets like most aircraft. The 737 Classic series featured CFM56 turbofan engines, which yielded significant gains in"
"the A330 and 777, respectively. The MD-11's long range advantage was brief as it soon was threatened by the A330's four-engine derivative, the A340, and the 777. With the exception of the Dassault Falcon 7X, Falcon 8x, and Falcon 900, no manufacturer now produces three-engine airliners. Modern engines have extremely low failure rates and can generate much higher shaft power and thrust than early types. This makes twinjets more suitable than they were before for long-haul trans-oceanic operations, resulting in eased ETOPS restrictions; modern wide-body twin-engine jets usually have an ETOPS 180 or even (in the case of the Boeing"
"engines power eight enclosed fans. The fans allow for vertical take-off and landing and, once the vehicle is aloft, rely upon the ground effect to create a cushion of air that the vehicle sits upon while flying. The eight separate engines exist for redundancy, allowing the craft to continue flying if one engine goes out. If two engines go out, the craft will make a ""survivable hard landing"". The engines can be powered with gasoline, diesel or ethanol fuels. The computer system monitors stability and the vehicle has only two controls, one for speed and direction and the other for"
"planned Boom supersonic transport (SST) airliner is planned to use three engines, with the third engine installed in the tail with a Y-shaped duct and air intakes on both sides of the rear. Trijet A trijet is a jet aircraft powered by three jet engines. In general, passenger airline trijets are considered to be second-generation jet airliners, due to their innovative engine locations, in addition to the advancement of turbofan technology. Other variations of three-engine designs are trimotors, which are aircraft with three piston engines. One issue with trijets is positioning the central engine. This is mostly accomplished by placing"
"too high, so Boeing's entry was a revised design, the Model 432, with the four engines buried in the forward fuselage. The USAAF awarded study contracts to all four companies, requiring that North American and Convair concentrate on four-engined designs (to become B-45 and XB-46), while Boeing and Martin were to build six-engined aircraft (the B-47 and XB-48). The powerplant was to be General Electric's new TG-180 turbojet engine. In May 1945, the von Kármán mission of the Army Air Forces inspected the secret German aeronautics laboratory near Braunschweig. von Kármán's team included the chief of the technical staff at"
"engine and some are twins. In all cases the engines are mounted over and above the wing leading edge. Twins have their engines as close together as the propellers diameters will allow. Most engines have been from the Rotax range: the Rotax 503 UL-2V and the Rotax 582 UL two cylinder two strokes, the first air-cooled and the latter with mixed air and water cooling, and the Rotax 912 UL water-cooled flat four. The Jabiru 2200 has also been fitted. Some drive two blade propellers, though others have three blades. The Korvet's fuselage is a flat sided, two step hull"
"on 3 engines for repair. Earlier an engine and pylon had fallen off a BOAC Boeing 707 in April 1968, resulting in five deaths. After this accident, Boeing issued a service directive to all owners of the 747 regarding its fuse pins. Engines and pylons had to be removed from 747s and the fuse pins examined for defects. If cracks were present, the pins were to be replaced. El Al Flight 1862 On 4 October 1992, El Al Flight 1862, a Boeing 747 cargo aircraft of the state-owned Israeli airline El Al, crashed into the Groeneveen and Klein-Kruitberg flats in"
"conserve fuel. When the jet engines were shut down, louvers closed off the front of the pods to reduce drag and to prevent ingestion of sand and dirt. The jet engine louvers were opened and closed by the flight crew in the cockpit, whether the B-36 was on the ground or in the air. The two pods with four turbojets and the six piston engines combined gave the B-36 a total of for short periods of time. The B-36 had a crew of 15. As in the B-29 and B-50, the pressurized flight deck and crew compartment were linked to"
"pressure of . Although engine weight increases by 30%, aircraft fuel consumption is reduced by 15%. Sponsored by the European Commission under Framework 7 project , Bauhaus Luftfahrt, MTU Aero Engines and GKN Aerospace presented the concept in 2015, raising the overall engine pressure ratio to over 100 for a 15.2% fuel burn reduction compared to 2025 engines. On multi-engine aircraft, engine positions are numbered from left to right from the point of view of the pilot looking forward, so for example on a four-engine aircraft such as the Boeing 747, engine No. 1 is on the left side, farthest"
"fuel economy and a reduction in noise over the JT8D engines used on the −100 and −200, but also posed an engineering challenge given the low ground clearance of the 737. Boeing and engine supplier CFMI solved the problem by placing the engine ahead of (rather than below) the wing, and by moving engine accessories to the sides (rather than the bottom) of the engine pod, giving the 737 a distinctive non-circular air intake. The wing also incorporated changes for improved aerodynamics. The engines' accessory gearbox was moved from the 6 o'clock position under the engine to the 4 o'clock"
"pulse at ground level that betrayed approaching flights. Beginning with the B-36D, Convair added a pair of General Electric J47-19 jet engines suspended near the end of each wing; these were also retrofitted to all extant B-36Bs. Consequently, the B-36 was configured to have ten engines, six radial propeller engines and four jet engines, leading to the B-36 slogan of ""six turnin' and four burnin' "". The B-36 had more engines than any other mass-produced aircraft. The jet pods greatly improved takeoff performance and dash speed over the target. In normal cruising flight, the jet engines were shut down to"
"of them were found attached to the wing structure. Two of the engines were together at a distance of approximately 200 feet from the right wing, which itself was upside down on the left side of a fuselage section. Three of the engines were in fact recovered from the ocean floor on January 11, 1973. Among the engines recovered were Nos. 2 and 3. The propeller of the No. 2 engine was feathered, indicating that there had been engine failure at some point before the crash. The magnetic sump plug of No. 3 engine had pieces of broken cylinder rings,"
"such programs are usually offered by third party service centers. Boeing is also designing and testing composite hardware so inspections are mainly visual. This reduces the need for ultrasonic and other non-visual inspection methods, saving time and money. The 787 is powered by two engines; these engines use all-electrical bleedless systems, eliminating the superheated air conduits normally used for aircraft power, de-icing, and other functions. As part of its ""Quiet Technology Demonstrator 2"" project, Boeing adopted several engine noise-reducing technologies for the 787. These include an air inlet containing sound-absorbing materials and exhaust duct cover with a chevron-toothed pattern on"
"typically had this configuration, although American Airlines had turbocompressors on engines 2 and 3 only. Early 707 models often had turbocompressor fairings on all four engines, but with only two or three compressors installed. The JT3D-3B engines are readily identifiable by the large gray secondary air inlet doors in the nose cowl. These doors are fully open (sucked in at the rear) during takeoff to provide additional air. When the engines are throttled back to cruise, the doors are shut. The 707 was the first commercial jet aircraft to be fitted with clamshell-type thrust reversers on each of the four"
"position (from a front/forward looking aft perspective). This side-mounted gearbox gives the engine a somewhat triangular rounded shape. Because the engine is close to the ground, 737-300s and later models are more prone to engine foreign object damage (FOD). The improved CFM56-7 turbofan engine on the 737 Next Generation is 7% more fuel-efficient than the previous CFM56-3 in the 737 classics. The newest 737 variants, the 737 MAX family, are to feature CFM International LEAP-1B engines with a fan diameter. These engines are expected to be 10-12% more efficient than the CFM56-7B engines on the 737 Next Generation family. The"
"prevented the engines from ingesting dirt and debris and shielded some of the engine noise from the ground so that the transport could make a quieter approach. The McDonnell Douglas YC-15 had four engines, while the Boeing version had two. The YC-15 used large double-slotted flaps that extended over 75 percent of the wingspan to enhance STOL capabilities. To save costs, it used a modified DC-8 nosewheel unit and the DC-10 cockpit, adapted for a two-person crew, with two lower windows for visibility during short-field landings. The increasing importance of strategic vs. tactical missions eventually led to the end of"
"least four engines, two or more on each wing : Two engines in fuselage, with one propeller each at the front and at the back (Push-pull configuration): Four engines in fuselage, with one propeller per side: The following German World War II aviation engines were designed as opposing-rotation pairs for counter-rotation needs: Counter-rotating propellers Counter-rotating propellers, also referred to as CRP, found on twin- and multi-engine propeller-driven aircraft, spin in directions opposite each other. The propellers on both engines of most conventional twin-engined aircraft spin clockwise (as viewed from behind the engine). Counter-rotating propellers generally spin clockwise on the left"
"or Boeing 737). Domestic jets normally use the seven jetbridge stands (gates 30–37), while the five non-bridged gates at Terminal A (gates 25–29) are used for domestic regional aircraft. International flights all use the eight non-bridged gates at Terminal B (gates 42-49). The Air Force has six stands for military freight planes up to the size of a Lockheed C-5 Galaxy (code F), although one is permanently used for deicing. Southeast of Terminal B is a collection of hangars and facilities belonging to various airlines. The largest is a hangar belonging to Scandinavian Airlines, dating from 1979, and a hangar"
"passengers. United Airlines requested a four-engine aircraft for its flights to high-altitude airports, especially its hub at Stapleton International Airport in Denver, Colorado. American Airlines, which was operating the four-engined Boeing 707 and Boeing 720, requested a twin-engined aircraft for efficiency. Eastern Airlines wanted a third engine for its overwater flights to the Caribbean, since at that time twin-engine commercial flights were limited by regulations to routes with 60-minute maximum flying time to an airport (see ETOPS). Eventually, the three airlines agreed on a trijet design for the new aircraft. In 1959, Lord Douglas, chairman of British European Airways (BEA),"
"and CFM56-3B2 engines, including over 1,800 engines that had already been delivered to customers. In August 2016 Southwest Airlines Flight 3472 suffered a fan blade failure, but landed later without further incident. While the aircraft sustained substantial damage, there were no injuries. On April 17, 2018, Southwest Airlines Flight 1380 suffered from what appears to be a fan blade failure, debris from which punctured a window. The Boeing 737-700 landed safely, but one passenger was killed and several were injured. Airlines have reported 32 events involving sudden instability of thrust, at various points during flight, including high thrust settings during"
"A350. Before the successor to the original B-747 is found, a panel of secretaries of top ministries like defence, finance, aviation, external affairs, home along with brass of the Special Protection Group (SPG) will meet to address two key issues — whether the new plane should be two-engine or four-engine and whether AI or Indian Air Force should be operating and maintaining the plane. ""There is a huge price difference in the price of twin-engine and four-engine jets. So there is the obvious financial angle,"" said highly placed sources. The IAF maintains and operates a fleet of Boeing Business Jets"
"be performed. The engine manufacturer estimated the new directive affected 352 engines in the US and 681 engines worldwide. On April 23, 2018, Southwest Airlines announced that it was voluntarily going beyond the FAA EAD requirement and performing ultrasonic inspections on all CFM engines in its fleet, including two each on approximately 700 Boeing 737-700 and 737-800 aircraft. On April 30, 2018, the aircraft involved in the accident was released by the NTSB, and was flown by Southwest Airlines to a service facility performing major services on Boeing aircraft at Paine Field in Everett, Washington for repairs. On May 2,"
"participate in the development if one of the three companies designs was selected. The Lockheed design was eventually selected and developed into the F-22 Raptor. In April 1994, Boeing introduced the most modern commercial jet aircraft at the time, the twin-engine 777, with a seating capacity of approximately 300 to 370 passengers in a typical three-class layout, in between the 767 and the 747. The longest range twin-engined aircraft in the world, the 777 was the first Boeing airliner to feature a ""fly-by-wire"" system and was conceived partly in response to the inroads being made by the European Airbus into"