https://generalaviationnews.com/2019/01/03/proposed-ad-could-affect-almost-20000-piper-aircraft/
"To review maintenance records and calculate factored service hours, the FAA estimates two work hours at $85 an hour for $170 per airplane. Total costs for the U.S. fleet: $3.3 million.
The estimated costs to do the eddy current inspection, if needed, is $147.50 per wing spar, according to FAA officials. Add to that another $85 work hour for reporting the results to the FAA."
So about $500. Would make me feel better about flying my family in the 10k hr former 141 bird in my photo, as well as our other four 6k-15k hour pa28s. It's 2 bolts out of 18... not removing the wing.... not seeing the fears of the inspection making the wings fall off. Wish they'd get on with it.
I much prefer knowing the spar isn't cracked than assuming/ hoping it isn't. These planes are getting old. Aluminum cracks from being stressed. Matter of when, not if.
https://en.m.wikipedia.org/wiki/Fatigue_limit
"Other structural
metals, such as
aluminium and
copper, do not have a distinct limit and will eventually fail even from small stress amplitudes."
It's too bad piper didn't make that spar a bit bigger, but here we are.