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The final major derivative was the 707-320, which featured an extended-span wing and JT4A engines, while the 707-420 was the same as the -320, but with Conway turbofan engines. Though initially fitted with turbojet engines, the dominant engine for the Boeing 707 family was the Pratt & Whitney JT3D , a turbofan variant of the JT3C with lower ...
In 1959, important orders for the engine were the Boeing 707-120B and Boeing 720B when American Airlines ordered one 707 powered by JT3D turbofans and KLM ordered a JT3D-powered Douglas DC-8. Earlier 707s and DC-8s had been powered by the JT3C and JT4A turbojets, and the improved efficiency of the turbofan soon attracted the airlines. A JT3D ...
April 8: BOAC Flight 712, a 707-465, suffered engine failure on take-off from London Heathrow Airport followed by an engine fire. The plane made an emergency landing back at the airport, but an explosion in the port wing caused the plane to catch fire.
Trans-Air Service Flight 671 was a cargo flight from Luxembourg Airport to Mallam Aminu Kano International Airport in Kano, Nigeria.While flying over France on 31 March 1992, the Boeing 707 operating the flight experienced an in-flight separation of two engines on its right wing.
During the 1950s the J57 was an extremely popular engine, with numerous military applications. Production figures were in the thousands, which led to a very reliable engine. Consequently, it was only natural for Boeing to choose the J57 civil variant, the JT3C, for their 707 jetliner. Douglas did likewise with their DC-8.
Before the arrival of the Pratt & Whitney JT3D turbofan engine, the JT4A was used to power certain Boeing 707 and Douglas DC-8 models, bringing improved field performance in the medium-range Boeing 707-220 and Douglas DC-8-20, and intercontinental range in the Boeing 707-320 and the Douglas DC-8-30.
On October 19, 1959, N7071, a Boeing 707, was on a demonstration and acceptance flight before being delivered to Braniff International Airlines. The flight was also used to instruct the Braniff pilots. During aerodynamic maneuvers control was lost, causing the forces to rip three engines off.
The Conway engine was used on versions of the Handley Page Victor, Vickers VC10, Boeing 707-420 and Douglas DC-8-40. The name "Conway" is the English spelling of the River Conwy, in Wales, in keeping with Rolls' use of river names for gas turbine engines.