Originally Posted by Ironflight
AC drops can happen fast or slow, and it can be hard to predict. The bottom line in this case is that a good flight test program is going to take you 30-40 hours anyway, so its not a huge time saver. The purpose of task based flight testing is getting pilots to actually DO good testing rather than simply “fly off the hours” - so if you’re going to do a good test program anyway, then get it flying and get it done!
Paul is correct in that it will likely take you nearly 40 hours to properly flight test your aircraft anyway, especially if it's a a complex or high-performance aircraft.
Also, it's important to remember that an Advisory Circular is just that - advisory. it is NOT regulatory. So no changes could actually be made to your flight test phase 1 time until there are changes made to the operating limitations that we issue to the aircraft. Right now, we are required (for amateur-built aircraft) to issue either the 40 hour or 25 hour fight test period, just like we have been issuing for the past many years. There is currently no provision for an alternate, "task-based" flight test period.
Publication of the AC is not the controlling event. Publication of a new Order 8130.2 that allows the task-based flight test period is what you have to wait for.