if you leave within 5-yrs of moving onto PAS, you will get a pension based on the Spec Aircrew Terms of Service (SATOS). This is covered in the relevant AP. The rates are harder to find - try a search for SATOS as pdf copies lurk on t'internet. This is how it works under AFPS75. If AFPS2015 comes along, I would expect existing AFPS75 arrangements to be honoured as I understand it is too difficult to change? (act of parliament or somesuch?). I was in your boat a while back and made my decision based on "what have you got to lose by going PAS?"
