You may not have understood everything that Wayne had written, it may
deserve a 2nd read.
"Ralph.. when you cut a hole in a skin, anywhere on the bird, you are
mandated by the inspection program / AC:43 to put a doubler around the
perimeter of the hole. *That said... a patch cover not only becomes said
doubler, it's also one solid piece and ideally is stronger than the doubler
and then a filler plate.*"
I you guys ever have to get into your tank later, can pretty much guarantee
you're going to replace cover and/or doubler when ripping them apart.
Our (Wayne & myself) advice on the subject it out there, so now it just
becomes your choice as how you go about it. Easy fix now, easy access later
(one piece) or double the work and double the troubles (two piece).
Cheers,
Jeff
On Sun, Jan 22, 2012 at 5:22 PM, Dick Wampach <rwampach@att.net> wrote:
Ron: As Wayne says you should use a doublers around all access holes.
With that being understood, might as make it a flush patch. I just happen
to have an example on the web... Area 106, 3rd down, access panel,
4/21/2008. I think it looks good
The ring was made from the plates Murphy sent as a repair kit for "leaking
fuel tanks on wings made in the Philippians". Then a smaller plate was
fabricated to fit flush. The ring went in with hard AN-426 AD-4-
standard
countersunk driven rivets. A HIGH adhesion Pro-seal was painted on both
surfaces and the rivets were dipped in the stuff, then driven.
The Flush mounted plate went in using the Murphy supplied AVEX Universal
head tank rivets. I chose to use a LOW adhesion sealant, both contact
surfaces painted, rivets dipped in this stuff, and AVEX tank rivets pulled.
No leaks when tested for a month with 100LL.
This is a standard procedure per Cessna service manuals on wet wing
airplanes.
Dick Wampach SR-108 N331RW
----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Ron
Shannon
Sent: Sunday, January 22, 2012 2:33 PM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Re: tank bottom skin material
[ Ed: Thread fork alert! ]
Understood, and exhaustively considered, of course. Obviously, flush covers
require almost twice as many rivets as surface mounted covers with no
doublers. Just a personal choice, made with eyes wide open -- I think. More
than one expert builder I know of has chosen flush covers. If they can do
it, I can do it -- maybe! ;-)
Ron
On Sun, Jan 22, 2012 at 1:22 PM,
Ron,
If I remember correctly, you were concerned about sealing rivets if
you chose to put in tank access covers. So this leads me to the
question of why you would want to put in access cover doubler's and
tank covers?
Is it the flush tank look you're going for? Cause flush mounting the
covers will not make you go faster..... and btw without doubler's
won't slow you down either.
Cheers,
Jeff
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