In article ,
(Slingsby) writes:

the AD for the Duo Discus had an inspection of the rear
side of the upper spar cap only. There must be an assumption that if
epoxy resin oozed out the back it equally oozed out the front side.
How good is that assumption?

I think SH has you inspect the aft face of the spar because the front side has
a foam dam to help keep the bonding paste from squeezing out. So if there is a
void at the aft side then the void may or may not go through to the front side.
If there is no void it highly likely that there is enough bonding paste all
across the bonding area.

Now I if you don't like the word "likely" when applied to this particular
process then you should not fly any composite glider because such assumptions,
based on tests and real world experience, are used through the construction
process. 100% inspection of every bonded joint is impossible given the
constraints of manufacturing of gliders as it is done now. Perhaps these
incidents will cause the LBA and manufactures to re-think the inspection
standards. And likely raise the price of an already costly toy.

Robert Mudd