On Apr 6, 4:26*pm, jcarlyle wrote:
I can't understand why they'd specify liquid penetrant NDI. It can't
reliably find small cracks, and is easy to mis-use (with subsequent
false security that the part is not cracked). I'd go for eddy current
or ultrasound, myself. If you do use penetrant, make sure you follow
the directions precisely.

-John


The comment period is to May 21, 2020.
With your expertise you could submit an alternate means of compliance
suggestion to the FAA.
Let us know how it works out.

Burt
Marfa, Texas USA