I do mine during the take off roll and top of descent, unless I'm compelled to leave a sacrifice to the OWT Gods.
I might select the L and R mag during taxi to check whether a mag or plug is completely dead (or has been stolen - where do you live, Jabba?) if something doesn't feel right. But that's about it. Any problem found during a run up at e.g. 1700 or 1800 RPM can usually be found at idle RPM. Some problems at full power won't be found during a run up at e.g. 1700 or 1800 RPM.
You have to check all the numbers when you go balls to the wall anyway ...
And if the one-in-a-million happens and the prop governor won't move the blades off the fine pitch stops when you get to TOPC, take a deep breath and ...
Relax.
PS: I got me one o' them new fangled en-jine monitors. Yee har!
Last edited by Lead Balloon; 8th Jul 2016 at 10:18.