From: firstname.lastname@example.org (Greg Wright) Organization: Boeing Computer Services Date: 26 Jun 94 16:18:24 References: 1 2 3
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In article <email@example.com>, Woodhams <firstname.lastname@example.org> wrote: >Stephen L Nicoud <stephen.nicoud@Boeing.Com> writes: >> Successful completion of the testing program is expected to lead to the >> certification of Pratt & Whitney-powered 777s in April of next year, with >> delivery of the first customer airplane to United Airlines scheduled for >> May 15, 1995. Certification of GE-powered 777s is expected in August 1995, >> and certification of Rolls-Royce-powered 777s anticipated in January 1996. > >Why does it take so long to certify the plane with the different >engines? (10 months to certify the whole plane plus P&W engines, >another 9 months after that before the RR engines are certified.) I >would have guessed that 80% of the certification testing would be >independent of which engine was used. The testing of the Rolls-Royce-powered 777s may not start right when the testing of the previous engine ends. Also, engines can make a very big difference in the performace of the wing in areas such as landing and takeoff. They really can change the airflow in high-lift/low-speed areas of the flight envelope. As you know, these are the two most important part of the flight testing: landing and takeoff performance. greg. -- ________Greg Wright________ Software Development | email@example.com | 777 Division. | firstname.lastname@example.org | |___uunet!bcstec!gregory____| NOT A BOEING SPOKESPERSON.