Maybe I'm really missing something here.... All the old editions of AP3392 are surely replaced by the current edition, and that states:
(1). With effect from 1 Apr 03, NCA who began IOT on or before 31 Mar 03, will continue to receive their NCA rate of FP during IOT. On commissioning and during Pilot or WSO training, they will continue to receive their NCA rate of FP until such time as they have completed a 72 week QP, or are suspended from such training. They will then transfer to the Initial Rate of FP for officers and will remain at this rate for 4 years. However, time spent in receipt of NCA rates of FP is to be counted towards progression up the officer rates of FP.
So, if you started IOT before 1 Apr 03, then these are your terms?!?