Fsii Al48
Seems industry wide Air BP are doing the same. Do not panic however, an injector system for AL48 can be installed between the filter and the pump. There are quite wide variations in flight manuals as to when additive is actually needed. eg EC135 minus 20, MD 902 minus 10 degrees celsius.
I am a bit of a bore (actually no, a lot of a bore) on this subject as it has affected my installation recently.so have done a lot of research into the options.
We have decided to bite the bullet and are having an injector installed to ensure corret dose and ease of application.
We have not decided when the additive will be added, but probably as temperatures approach zero C.