It doesn't matter whether you are in flight or on the ground. Common sense dictates that you do the memory items portion of the engine fire checklist which will do what was required, shut down the engine and cutoff the fuel. Is there any good reason to delay cutting off the fire because item 8 on the most appropriate checklist happens to say land at the nearest suitable airport?
One needs to use some logic. Stop the aircraft, set the park brake, (possibly make some sort of remain seated PA, if that is the company procedure and appropriate for the situation), then the PIC can do the appropriate Memory Items. Once again, use logic as you don't need to select the autothrottle arm switch off, just quickly do the appropriate memory items. All this can be completed in less than 10 seconds from the parking brake being set. Then if evacuation is required, follow that checklist(which can be accessed quickly because Boeing made it on the back page of the paper QRH(in addition to the e-checklist).
Not sure why the engine fire checklist was called for initially. That can lead to delays in the critical first items, especially with some new guy trying to sort through the electronic checklist and making wrong inputs due to rushing/lack of familiarity, etc.
Last edited by JammedStab; 29th Jun 2018 at 04:25.