I let my DAR know, or ask someone at your FSDO. They will tell you, but I do believe that an engine change will do that. In fact, if I remember correctly, I went back to phase 1 when I changed from the VW to the Corvair on the BlackBird.
See N64KR at <http://krbuilder.org/> http://KRBuilder.org - Then click on the pics 2015 KR Gathering - McMinnville, OR. September 3 - 6 -- See U There. Peoples Choice at 2013 - KR Gathering in Mt. Vernon, Il - MVN Best KR at 2013 - KR Gathering in Mt. Vernon, Il - MVN Best Interior at 2013 - KR Gathering in Mt. Vernon, Il - MVN Best Paint at 2013 - KR Gathering in Mt. Vernon, Il - MVN Best Firwwall Forward at 2013 - KR Gathering in Mt. Vernon, Il - MVN Best Interior and Panel at 2008 - KR Gathering in Mt. Vernon, Il - MVN Daniel R. Heath - Lexington, SC -----Original Message----- From: KRnet [mailto:krnet-bounces at list.krnet.org] On Behalf Of CraigW via KRnet Sent: Saturday, October 24, 2015 7:17 AM To: KRnet Cc: CraigW Subject: Re: KR> Phase 1 and Phase 2 flight testing Interesting...I never thought you ever would go back to Phase 1. So let me pose a question. If that is true and you make a major change like going from a VW to a Corvair do you have to go back to Phase 1?