ANVIS and power supply
Letsbe; I think ANVIS are now approved for use but you can't use the ANVIS that use lithium battery power because you are not allowed to carry spare Lithiums for any system on board (PAOC dangerous air cargo refers) I don't think there is a dispensation, and if there was you would need a metal ammo box to keep them in, hardly handy when you need to change a battery! I have used the ANVIS with 2x 2 AA batteries that last about 20 hours a pair, I haven't flown a 40 hour night mission yet so I thought they were adequate!
SSID: just offering suggestions to operators who may get neck strain. Also the reason to take them off in the over the scene situation is if for example you are not up to anything other than FLIR monitoring. {personnally I wouldn't take them off but some do and some don't)
sf