Whats difficult with any of this
The length of time it takes to ensure competency and comfort with the new technology.
The extra burden placed on remaining crews who aren't doing the conversion training at that particular moment.
The cost and administrative burden of setting up an alternate training location (please don't try and suggest that thorough overland NVG training can take place in a place like the Shetlands when you're never more than a stone's throw away from the sea).
The difficulty for despatchers in knowing whether today's crew is NVG capable or not.
The usual barriers to training (weather, sickness etc)
The extra serviceable aircraft required to run a long term second line to convert so many crews.
The fact that it'll be summer!
I'm sure there would be more were I not just about to sit down to dinner.
