Hi Outwest,
I think the difference between the two is that the Cat B check is done at 100% NR whereas the Cat A check is done at 102%.
I know a lot of operators carrying out Cat A complete the check daily before first flight but operators under Cat B only do it every 50 hours. My question, is by reading the procedures in the RFM, shouldn't the PAC also be carried out daily for Cat B operations? From what I understand the 50 hour requirement for recording of figures is purely a trend monitoring tool, however a daily PAC should still be carried out as a go/no-go item regardless of whether you are conducting Cat A or B operations.
Nomad