Penko, I am not able to answer that question. The thread dissolved into a personal and profane diatribe towards me for bizarre reasons. I completely understand differing opinions and accept the rationale for SETO in terms of fuel saving, which again personal opinion I believe is ‘risky’ for well documented reasons. As people are so interested the last 737 airline I worked for carried out SETI (including me) with many caveats. They risk assessed SETO and found it wanting. The main reason being SA on taxi was compromised and engine start is supposed to be monitored by both pilots. I am not at liberty to say what the manufacturer thinks of the procedure but a straw poll of colleagues were aligned with the view I have given. Hope that helps.