Just coming back to the power assurance checks, I have been reading through the RFM Issue 2, Rev 15 (so my information may be outdated by subsequent revisions) and I have come to the following conclusions but would be more than happy to hear other opinions...
1. SECTION 2, PAGE 2-28 - Take off checks, Cat B take off, step 3 - power checks.
Carry out DAILY power checks in accordance with in-flight power checks procedure in Section 4.
2. SECTION 5, PART A, PAGE S12-A9 - Vertical take off procedure for Cat A ops, step 5 - power checks.
Carry out DAILY power checks in accordance with engine power checks procedure in Part K Common Performance.
3. SECTION 1, PAGE 1-23 - Power Margin Trend Monitoring.
Every 50 flight hours record engine power assurance check values for engine power margin trend monitoring purposes.
Now, from reading this information, my understanding is that for both Cat A and Cat B operations a DAILY power assurance check must be carried out (and passed) before flying and the 50 hour requirement is purely an interval to record figures at for engine trend monitoring purposes.
This is just what I conceive from reading the RFM so please tell me if I am way off the mark as sometimes the Augusta manuals can be a bit ambiguous with regards to their content.