Nigd3,what aircraft are you doing the tests on,as a starter. ?How do you know the accelerometer is accurate?Has it been calibrated? Why is the anti-g system u/s? Even so,it is most unusual to take an a/c to it`s max g on an airtest,unless it is a new type,and even if it is it is essential that it is done progressively.It sounds as though you are talking about an ex-mil jet,in which case you need to know about it`s stalling characteristics as well,under `g` loading.OTHERWISE YOU CAN COME UNSTUCK IN A SHORT SPACE OF TIME.
`We`, of course can help/advise,so please fill in the gaps....Syc.