Importing this from
another thread:
spacemansteve: "I was doin a solo nav and it took me about 15 mins to realise that i'd been running on PFI"
PFI?
"Prop full increase...
Don't think the engine appreciated me after that... come to think of it... about a week later when i was doing my Progress test i flew the same aircraft... A bit of rough running in the circuit... Guess i cost the aussie public a few bucks in repair costs
PFI! You just taught me something about flying,
SSS!
I've only ever said say "prop forward", "full increase" "prop fine", "beta", etc. HA! I like PFI! Sounds more technical. Either that's used in OZ and not so much in the USA, or there's a gaping gap in my training. Actually if a term is used anywhere and I don't know it, I consider that a gap in my training. Mind the gap.
Anyway, don't feel bad, not that it sounds as if you do- I've left wheels out, flaps out, left a tailstand on the tail once, etc. suffering various takeoff brainfarts over the years. That's not including the usual forgetting to switch on transponder, lighting, de-ice (that can get scary) etc.
I highly doubt you did any damage cruising at PFI and a couple-hundred revs over nominal redline. You probably sounded like a mad hornet from the ground, though. Real overspeed is quite a bit past redline, where catastrophic, not subtle things happen. At least that's been my experience with fixed-pitch props and aerobatics- lotsa overspeeds, no catastrophic engine failures attributable to overspeed damage. Think about what they do with engines in air racing: They turn them WAY faster than stock redline RPMs, often with stock engines, especially with cheaper formula racers like
Cassutts and such- and blow them regularly

But not until hours and hours of abuse.
What I rarely do (and see other pilots do too often) is select PFI approaching arrival, but before adequately slowing down. That's obviously a lot harder on engines, because it's so much more sudden. Next time I'm giving a flight check and some hapless soul leaves the props back on short final, I'm going to tersely say PFI!
PFI! and see if I can get him going (he'll prolly just look at me like I'm psycho, and ease the prop levers forward). Anyway, thanks for the PFI term, I had no clue.