Folks,
Once again, the anti-LOP troglodytes are out in force, again! All those airlines, over years of "big pistons" had it all wrong!! Pratt & Whitney and Curtis Wright had it all wrong.
Our semi-illiterate mate Connedrod, has chucked his two bob's worth in --- Rod, for your information, at a given HP output, the aircraft performance will be the same, the only difference at, say 65% power, ROP and 65% power, LOP is the fuel flow -- unless you have invented ROP/HP and LOP/HP.
As for the whole document, it is a simplistic "teaching you to suck eggs" effort.
Amazingly, I did know you are supposed to get all the blast cleaning material out after I have cleaned a plug --- and I would hope every LAME, indeed every first year apprentice (if there is still such a thing), knows.
I do highly recommend the small Champion book and card for reading plug condition. And please use a recommended tool to adjust gap, not as I saw quite recently, a plug clamped in a vice, and the "adjustment" being "achieved" with a hammer and cold chisel.
Engine manufacturer's manuals for particular engines are a far more reliable guide to the engine capability, than an AFM/POH for reasons made obvious (marketing edge) in a previous post.
Tootle pip!!
PS: Eddie, our mate Lead Balloon is actually very well qualified in the aero MRO field, I hope he doesn't mind me letting the cat out of the bag.