----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
-----Original Message----- From: "Paul M. Anton" <[EMAIL PROTECTED]> Date: Wed, 12 Dec 2001 14:03:23 -0800 To: ERCOUPE <[EMAIL PROTECTED]> Subject: [COUPERS] Rear Spar corrosion & rudder stuff. Paul, I made the same comment earlier, that when I restored my coupe and had the wings off it is relatively easy to see that area. I did a pre--buy inspection a couple of weeks ago and we took off the wing attach fairings and used a light and mirror to see in there. I agree, you can see it this way- but to fix it you would have to cut the holes. Jan Z > ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- > > Since my annual was up in November, I decided to finish stripping the paint > from 73H and to do all the odds and ends that I'd rather do in a nice warm > garage than out on the ramp. > > I played around with ways of looking at the back side of the rear spar > without cutting a bunch of holes or buying an expensive borescope. > > Behind the rear seat there are two lightening holes about 3-1/2 inches > in diameter. These are the holes that the wing Nav light wires route through. > A bare bulb will fit in these holes. Then if the wings are off it is easy to inspect > the rear of that false spar. With the wings on, it looks like a mirror could be used > by removing the wing fairings and be able to see that area.The rear of the front > spar is a bit easier to look at. > > If however any corrosion cleanup were necessary, then the holes would have > to be cut. > > My plane is very clean corrosion wise. There is however some surface stuff > that leads me to believe that this area bears keeping track of. > > > Another area is in the center section right behind the landing gear > since garbage is thrown up into the wing. > > I decided to install SB 105 while I was taking all manner of things apart. > As you may know, the rudders have been the subject of some AD and SB > action. > > AD 57-02-01 requires inspection of the rudder horn attachment and SB > 23 provided a means of reinforcing the rudder horn attachment by means of > a tee shaped stiffener > > Finally SB 105 provides a revised spar that is wider and heavier. My plane had > SB 23 applied. In application of this SB the tee shaped piece is held by some > strange special screws that hold the rudder horns on They are #10 going through > the rudder spar nut plates then neck down to #8 as they pass through the skin. > > One of my rudders had #10 nuts where the bolts passed through the skin rather > than the expected #8. This is one of the reasons I decided to install > SB 105. Well upon opening the rudder is discovered the spar was broken in two. > Some time in the past, some one had the screws that hold the rudder horns > on seize. They then made a real mess taking the screws out, twisting the end of > the spar with the nut plates until the spar broke. This took some effort to do! > The preps then just used some # 10 screws to hold the rudder horn fastening them > by drilling through the outside skin for clearance and putting the # 10 nuts on. > The rudder horn was then working on just the strength of the inside and outside rudder > skin. > > The amazing part of this is that the rudder passed AD 57-02-01. No excessive play--- > No clicking noise! Speaks for the strength of the original design. > > > > -- _______________________________________________ Get your free email from http://mymail.juno.com ==^================================================================ This email was sent to: [EMAIL PROTECTED] EASY UNSUBSCRIBE click here: http://topica.com/u/?aVxiLm.aVzvvT Or send an email to: [EMAIL PROTECTED] T O P I C A -- Register now to manage your mail! http://www.topica.com/partner/tag02/register ==^================================================================
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