Originally Posted by
DuncanDoenitz
As a Licensed Engineer/Mechanic I'd expect to allocate around 1 manhour to remove, clean, inspect, test and refit the 8 plugs on a small Cessna. By extrapolation, I'd make that about 42 manhours just to service the plugs of a B-36. That's a man-week. Compression checks and troubleshooting mag-drops must have been a hoot.
The SOP at least in the airline world, was to QEC the R4360 engines for a plug change rather than do it on wing.