Originally Posted by
Lead Balloon
LS
If it is true that “fixed final reserve may ... not actually be in the tanks” and “you have absolutely no idea of endurance remaining” as a consequence of cumulative errors, despite calculated fuel remaining on landing being 30 minutes, shouldn’t the rule require the declaration of a MAYDAY when calculated FFR on landing falls below 60 minutes? If your actual FOB “might be nothing” at a calculated FOB of 30 minutes, doesn’t the supposed “grave and imminent danger” start 30 minutes earlier?
No.
The name of the game is to ensure you don’t run out of fuel. By always landing with at least 30 mins indicated or calculated, your chances of running out of fuel should be sufficiently low.