SE, L/G DOWN GO AROUND performance
Maybe a bit off topic, but will post anyway.
B-777 & B-787 AOM and QRH insists that the crew check the Single Engine Go Around capability WITH the GEAR EXTENDED.
QRH Performance section give climb data for GEAR DOWN FLAPS 20 and GEAR DOWN FLAPS 30 Single engine performance.
I cannot find any reference to certification of airplanes go around performance with and engine shut down and the gear left down.
Our AOM for the B-777 dictates the use of flaps 20 for single engine approach as long as performance permits (I interprets that as a stopping performance), hence the G/A configuration is Flaps 5.
To confuse the issue further, the checking of gear down, single engine Go around performance was only required for Auto Lands. Now it is for all approaches.
When raising the question at fleet meetings I am told it is "a B777/B787 thing".