I have emailed AT to see if they have an answer. As I said earlier it was demonstrated to me once that a PT6 will not light until 12% as thats when the flow divider opens. I see their thought process in not turning the ignitors on until then in case there would be fuel in the can, but again if that is such a big concern with a PT6 then why is that not how it works in a RW installation. I really hate to say it, but I think that when AT switched from piston to turbines the test pilot was new to turbines and just thought this was a good idea with no real justification.
Just re-read the posting by sgs233a and see that for some unknown reason the P&W MM says to turn the ignitors on with a dash 34. Strange that in a 212 with a 3 or 3B engine they don't do this. Is there a difference in FCU? Flow divider? I would think other than power output and installation an old school PT6 is a PT6.
Last edited by Outwest; 6th Dec 2021 at 16:42.