Does anyone else print the briefing pack on A5 paper? (no i don't mean 2 up on A4)- I mean genuine a5 paper.)
‌
‌When I try doing this although the PDF it generates looks great on the iPhone/ipad preview  (where you then select the air print printer),the physical print doesn't start until a third down the paper so chops all the bottom off your plog, weather, notams or charts etc etc. 
‌ 
‌I've tried all the appropriate printer settings for a5 and my printer has the latest drivers/firmware. I have no problem printing a5 from any other app where supported or indeed a PC or MAC -it's  just the SD app that throws roughly a third of the page before starting printing. 
‌
‌I wondered if extraneous  postscript LF or similar codes were being thrown to the printer that the screen PDF render ignores (hence it looks fine on iPhone/ipad SCREEN) but the printer executes faithfully. No amount of me playing with settings has resolved this.
‌
‌thanks
‌

The way the briefing pack works is to generate a PDF and then present it, leaving the printing up to whatever app is showing the PDF. That is iOS itself on iOS, and whatever PDF reader you've chosen to use on Android.

I am not aware of any special codes we would send to any printer (in fact I'm certain there aren't any) because as I mentioned, we simply generate a PDF. I therefore cannot explain what you are seeing.