Duo Discus Tech note

"Mark Zivley" wrote in message
...
That would be very unfortunate. It's pretty clear that SH has provided
suitable places to drill holes on the premise that whatever boroscope
used is fairly short. Clearly, the underlying objective is to make sure
that the entire length of the upper spar flange (aft side) is visually
inspected for any areas which didn't get enough resin and therefore
might not be adequately bonded. If you can do that with a 25-30' long
boroscope then you'd be complying with the intent of the tech note. If
you call around to some companies specializing in NDT or perhaps who do
boiler tube inspections, etc. you may find a suitable scope.


It might be possible for a clever person to assemble a makeshift borescope
with a "lipstick" TV camera fitted with a close-up lens and an ultra-bright
LED for illumination. Just tape the camera to the end of a length of PVC
water pipe and insert it into the wing through the root. The wires for the
camera and LED would be neatly routed through the pipe. Wireless cameras
might work too.

I've used tiny CCTV cameras for the internal inspection of engines.

Bill Daniels