Hi Ian, We didn't send photos of the inspection holes. What you are thinking of is the lower section of the spar tunnel that Nigel removed to gain access to the drooping plywood underneath that was starting to rub against the elevator push rod.
The H36 has 4 compartments above the spar tunnel and behind the upper seat back that need inspecting. Tap along the top of the spar tunnel with a coin and you can hear where they are. Drill 2 x 12-14mm holes in the middle of each compartment. Use a drill with a right angle attachment or a die grinder on a flexible extension. The upper spar tunnel is mostly plywood with a few layers of glass on the bottom so you will go through it very quickly. Poke your light up one hole and your camera up the other. Make sure you are drilling in the right spot!...if you drill into the structural side walls that separate the compartments you are up the creek! ENDOSCOPE The Jaycar $40 endoscope is suitable for the 3000 hour inspection - make sure you get the one that is on a stiff gooseneck that can be formed to shape. There is another one that just comes on a floppy lead that won't do the job. LIGHTING The cheap endoscopes need good lighting. We used a super bright button LED (Jaycar cat# ZD-0445) which did the job very well. The LED does need a heatsink. Drill appropriate small holes at the end end of a length of narrow aluminium flat bar then use lockwire to mount it with silicon paste. This will fit through a 12-14mm hole The LED needs 3.3 volts and the brightness drops off rapidly below this. We used 3 x 1.2v AA NMh rechargeables. I am not sure if 2 x 1.5v AA alkalines would quite get the LED to maximum brightness. You can also buy a switched battery holder pack from Jaycar. Rob Thompson mobile 0429 493828 ........................................ --- On Sun, 17/3/13, Ian Mc Phee <[email protected]> wrote: From: Ian Mc Phee <[email protected]> Subject: [DOG mailing list] Drilling hole in tunnel To: "DOG LIST" <[email protected]> Received: Sunday, 17 March, 2013, 12:34 PM I have been flying but am back on our H36 3000hly I really have searched for photo either nigle of Rob sent me of holes in tunnel. Can somebody help me as am ready to drill finally Ian M
