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Ted Noel wrote:
3. Flight testing with a competent test pilot.
I think #3 is best since it deals with the variabilities of the installation and creates a hard VNE number.
Does it? How much margin do you have? Testing is intended to validate engineering analysis, not to substitute it.
Also, there are a lot of A/C installations flying. This implies a degree of safety.
Does it? How does your installation compare to the flying installations? How much safety margin do they have and how much will you have? How far have they pushed their airframe (intentionally and unintentionally) and how far will you push yours?
All that the flying installations indicate is that no one has done anything in their aircraft that has led to the airframe failing due to the modifications. Maybe there is enough margin that it has not compromised safety at all. Maybe it has cut deeply into the safety margin and there have been a lot of very close calls that no one has known about. Without a real engineering analysis taking the big picture in mind, no one really knows.
Regards,
Hamid
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