I fly with a tablet, my usual steed has a GTN650 in it, yet I still fly with a paper chart. In Europe, I particularly like the new trend for 1:1,000,000 charts, which are great for backup, and very compact and affordable.
In the USA about a month ago, I was (very thankfully!) not involved but in the building when a dispondent IR candidate came in with a rather angry DPE who had just failed the candidates IR checkride after in the middle of a procedure his iPad - the sole source of approach plate data he had in the cockpit, overheated and shut down.
It may well be minimal, it may well push your workload up, but I really don't like flying without at-least *just* enough on paper to finish the flight if all the data-holding electronics goes tits up.
But so far as I know this is not, and never has been, a legal requirement. The legal requirement is that the commander is satisfied there's sufficient and up-to-date data on board. The form of that is up to them.
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Last edited by Genghis the Engineer; 4th Jul 2019 at 15:58.