3500 upgrade

[Al & Deb Paxhia]

Has anyone started the upgrade? How is it going?




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[RJ Thomas]

I have started on the upgrade.

On the horizontal stabilizer, I put some countersinks where there were no
external doublers. Now, with the upgrade parts, there are external
doublers. I don't think I can UN-countersink, I am sure that I will not
UN-countersink, so I will need a few new parts ( main spar, skin, cap spars,
some ribs, etc ) to complete. I can't blame the folks at Murphy - they
didn't call for the countersinks........

On the wing, I started the upgrade when only the spars had been assembled.
Ergo, changing the attach brackets and doublers on the rear spar; the new
attach brackets and spar (caps?, they used to be attach brackets) on the
leading edge spar was relatively simple.

I have not seen the parts or instructions for any modifications on the
fuselage - I assume they will be forthcoming in time.

I don't call myself a builder, this is a first for me, nor am I an A&P or
anything. That said, FWIW, if my wings had been fully assembled when I got
the upgrade parts, I think the wings would have stayed at 2500# and the
upgrade parts would have stayed in the box. I don't think I have the skill
to do what the folks at Murphy did.

Cheers, rj

=====================================================

-----Original Message-----
From: Al & Deb Paxhia [mailto:paxhia2@home.com]
Sent: Monday, May 21,2001 11:50 PM
To: murphy-rebel@dcsol.com
Subject: Re: 3500 upgrade


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Has anyone started the upgrade? How is it going?

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[Warren T. Montgomery]

RJ

DH had a mod for the Dash-8 or twin Otter that an AME friend completed.
It called for filling a countersunk hole prior to putting on a doubler.
What they used as a filler/spacer appeared to be a cs rivet with center
drilled out. You should have lots of them on the shop floor!!! If you
contact MAM let me know what they think. I hadn't dimpled the stab or
Elev but I did for just about everything else. My upgrade kit has yet to
be sent. My plan for the wing is not to worry about the work until after
I pull it apart then I'll have no choice.
Warren

From: rj.thomas@halliburton.com
Subject: RE: 3500 upgrade

On the horizontal stabilizer, I put some countersinks where there were
no
external doublers. Now, with the upgrade parts, there are external
doublers. I don't think I can UN-countersink, I am sure that I will not
UN-countersink, so I will need a few new parts ( main spar, skin, cap
spars,
some ribs, etc ) to complete. I can't blame the folks at Murphy - they
didn't call for the countersinks........

Cheers, rj



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[Bob Patterson]

Good suggestion, Warren !! I remember seeing those 'fillers'.
The rivet heads should work fine, especially if they're held in
with a good coating of epoxy primer, which should be there anyway.

.....bobp

-----------------------------------orig.-------------------------------
At 11:20 AM 5/27/01 +0400, you wrote:

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RJ

DH had a mod for the Dash-8 or twin Otter that an AME friend completed.
It called for filling a countersunk hole prior to putting on a doubler.
What they used as a filler/spacer appeared to be a cs rivet with center
drilled out. You should have lots of them on the shop floor!!! If you
contact MAM let me know what they think. I hadn't dimpled the stab or
Elev but I did for just about everything else. My upgrade kit has yet to
be sent. My plan for the wing is not to worry about the work until after
I pull it apart then I'll have no choice.
Warren

From: rj.thomas@halliburton.com
Subject: RE: 3500 upgrade

On the horizontal stabilizer, I put some countersinks where there were
no
external doublers. Now, with the upgrade parts, there are external
doublers. I don't think I can UN-countersink, I am sure that I will not
UN-countersink, so I will need a few new parts ( main spar, skin, cap
spars,
some ribs, etc ) to complete. I can't blame the folks at Murphy - they
didn't call for the countersinks........

Cheers, rj
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