Duo-Discus US FAA Emergency AD 2003-16-51

Gotta love those government URLs:
http://www.airweb.faa.gov/Regulatory_and_Guidance_Library%5CrgAD.nsf/0/bdf974d0c050dae386256d7b006de98e/$FILE/031651.pdf

Please be advised that there are other ways of inspecting composite
bond joints than cutting holes into wings and inserting endoscopes. I
have been professionally involved in the design and manufacture of
ultrasonic composite bond testers used by the Air Force and know there
are other non-destructive alternatives. Some repair shops may already
have this equipment. If not, it can be rented:
http://www.easternndt.com/products.asp
This could make the inspection cost one tenth what it will if done by
the tech note, esp. if multiple gliders can be tested by the same
piece of equipment (rent it for a month and ship it between inspection
stations).