Re: Boeing 777 First Flight was today - June 12

From: (Woodhams)
Organization: University of Auckland
Date:         22 Jun 94 16:57:50 
References:   1 2
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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.

Michael W.