In article ,
Brash wrote:

You don't have to equip every single one. Just have enough sets to meet
requirements.

Well, yes, you obviously don't need them for aircraft
which you don't have pilots for nor for those not flying
due to maintenance. But one of the motivations for getting
multi role aircraft is that you need a smaller total
number as on a given day you can use almost all in a
particular role.
--
Urban Fredriksson http://www.canit.se/%7Egriffon/
"Failure requires effort. That's why some people never fail." -Bengt Anderberg