Oops 78: Currently, you can't land nor takeoff, using NVG. It's only allowed as an 'aid' to cruise flight.
We use it to identify bad weather, obstructions, wires, and at scene, with the nightsun, to search "visually" as well as thermally.
However, the Home office 'may' consider recommending more general use of NVG's in the not too distant future. The CAA might even allow us to take off and land too
As MG said, should the goggles fail, you have to be able to revert to existing night weather limits.
Fantastic piece of supplemental equipment...should be mandatory for rural flying.