Sorry Keith, my reply was more towards Brim's comment about CDA's being best practice to be aspired to whenever possible.
Of course, saftey is always a factor. And we do try to issue descent instructions to prevent you guys being above the glide path. But there are one or two operators that during our "CDA critical" night movements point the nose at the ground and level for ages and ages.
Gotta be honest...........that GASIL stuff is white man speaking with forked tongue.