What does AAC grading consist of? is it like the fleet air arm grading?
Yes - according to
Armed Forces - a7a3.1 - British Army - Army Aviation - Army Air Corps - Aircrew Selection and Training
"
Army Flying Grading (AFG) is conducted at Middle Wallop. This consists of 13 hours, over a three week period, in a Slingsby Firefly 160. The aim of this course is to test aptitude in a live flying environment and to identify whether students have the capability to become an Army pilot."
In the good old days we had the opportunity to solo on RN FAA grading, Wx allowing, but I know that this has been withdrawn from 727.