Weatherwatcher1 wrote:OldAeroGuy wrote:smartplane wrote:Will there be elements of 787 precedents / grandfathering used for the X, for example in relation to wing design / construction, ignoring the folding tips?
Please give an example of what you're talking about. How can something used on one model's Type Certificate (TC) be "grandfathered" to another model's TC?
The 777-9 wing is a new article with or without the folding tips. As such, it will be required to step up to the FAR level in place when its amended TC application was filed.
Engineering re-use is extremely common in aviation.
This whole conversation about “grandfathering” doesn’t make any sense when it comes down to definitions certification requirements. I haven’t seen anyone in this thread who is using the term “grandfathering” actually define if it is for a new type certificate, supplemental type certificate or amended type certificate.
OldAeroGuy and BoeingGuy have both provided substantial discussion on what "really" happens in the certification process between Boeing and the FAA and what "grandfathering" (AKA Change Product Rule) actually means. I gave up a month ago early on in this discussion because this topic was opened with only one thing in mind: making Boeing look bad by misrepresenting the actual certification process.