octupus rtow charts
hi,just a basic question.Presently on our A319s we use the weight entry octupus charts.I want to know for a weight like 59 t,do we interpolate between the boxes for 58t and 60 t even if they have different limit codes for eg 2/7 and 3/7.Intially in our ground school we were taught that we could only interpolate between the weight boxes which had similar limit codes.In case of different codes we were asked to simply move on to the higher weight boxes and to extract the speeds and flex.However in the last two years we have been advised that interpolation between weights with diff codes is allowed although no reasons were given for this change in the procedure.Thanks