Technology update
Re-engining the Boeing 707
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To enhance the economic benefits for Boeing 707 operators, the Seven Q Seven consortium is currently conducting a flight test program to certify the Pratt & Whitney JT8D-219 engine for the aircraft. The Seven Q Seven consortium is made up of Pratt & Whitney; Omega Air, which is providing financing; noted aircraft designer Ed Swearingen, who is supervising the technical aspects of the program; DER Engineering, which is coordinating the certification effort; BFGoodrich, which is integrating nacelle components, inlets, and reversers; and NORDAM, which is handling the cowl doors and struts. The consortium estimates that there are between 250 and 300 707 aircraft, which are candidates for this re-engining effort.
For the flight test program, the JT8D-219 engine was installed in the number one position of the 707 demonstrator, replacing the existing Pratt & Whitney JT3D/TF33 engine. According to Pratt & Whitney, this was the first time the JT8D-219 engine was flown in an under-wing position because it was originally developed for the MD-80, which features a fuselage-mounted configuration. Initial flight testing (over 20 h) demonstrated the engine's operability and compatibility with the 707. The next phase of the flight test program will entail another aircraft outfitted with three more JT8D-219 engines for full FAA certification to be completed by mid-2000.
The JT8D-219 engine, which is rated at 21,000 lb thrust, will provide a significant boost in power for the 707 while reducing fuel burn, operating and maintenance costs, and increasing range. The engine also meets all ICAO Stage III noise and emissions requirements.
Frank Bokulich
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