Skymaster Forum  

Go Back   Skymaster Forum > Messages
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
Thread Tools Rate Thread Display Modes
  #1  
Unread 01-04-18, 02:32 PM
Flyer770 Flyer770 is offline
Registered User
 
Join Date: Feb 2017
Location: Oregon
Posts: 38
Flyer770 is on a distinguished road
Removing Black Vibration Dampening Panels

What’s the best way you’ve seen to remove the old black panels? Wouldn’t mind doing that on mine and checking for corrosion when I’m in there.
Reply With Quote
  #2  
Unread 01-06-18, 08:24 AM
Mich3773 Mich3773 is offline
Registered User
 
Join Date: Jul 2015
Location: Canada
Posts: 35
Mich3773 is on a distinguished road
Removing corroded black vibration dampening pads is easy. If you tap the surface of them and they sound hollow, there's corrosion behind them. Also check the outside of the airplane, especially near any penetrations or near lapped sheets for signs of corrosion. What appears to be a small area of corrosion on the outside may be an extensive area on the inside.

I use a plastic scraper to shear under the edge of the pad. The pad will break at the corroded areas. I haven't had much luck removing the non-corroded ones; they're well stuck. If it's stuck on solid, leave it alone; there's no corrosion.

Note that Cessna says that you don't have to replace the pad. See Cessna Service Newsletter SNL93-3 for lots more info.
Reply With Quote
  #3  
Unread 01-06-18, 09:47 AM
Alfonso Alfonso is offline
Registered User
 
Join Date: Sep 2005
Location: Washington, DC
Posts: 32
Alfonso is an unknown quantity at this point
black vibration dampening pads

I have a C336 for 14 years and I love it. I read with great interest all the posts in this issue, but I am at a loss as to what to look for and where are the “black vibration dampening pads”. Any explanation or pictures will be very much appreciated. Thanks.

Alfonso.
Reply With Quote
  #4  
Unread 01-08-18, 10:27 AM
Mich3773 Mich3773 is offline
Registered User
 
Join Date: Jul 2015
Location: Canada
Posts: 35
Mich3773 is on a distinguished road
The Cessna manuals call the vibration dampening pads "Soundproofing". They are located all over the airplane. There will be a figure in the Illustrated parts manual with all their locations. (I'm missing that figure. Could someone else post it?)

Remove an interior panel. Behind the panel will be a layer of insulation. Gently remove whatever insulation is there; you may want to put it back. Behind the insulation you'll see the skin of the aircraft. Glued to the skin will be the black soundproofing pads. They're contain lead and they add a small amount of mass to the skin to reduce vibrations which create sound.

The attached photo shows the pilot-side wall of the baggage area. On the right, is a black soundproofing pad which is intact and well secured to the fuselage. On the left, is the white aluminum corrosion that was behind a rectangular soundproofing pad which was removed. The shiny spots show where there was no corrosion. With some effort, the corrosion cleans off back to shiny aluminum metal. Once clean, the metal can be treated to prevent further corrosion.
Attached Thumbnails
Click image for larger version

Name:	corrosion_small.jpg
Views:	883
Size:	578.2 KB
ID:	1810  
Reply With Quote
  #5  
Unread 01-08-18, 11:54 AM
hharney's Avatar
hharney hharney is offline
Forum Administrator
 
Join Date: Jul 2002
Location: Michigan (8D4)
Posts: 2,253
hharney is on a distinguished road
Not 100% sure the 336 had the dampening pads
__________________
Herb R Harney
1968 337C

Flying the same Skymaster for 47 years
Reply With Quote
Reply


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 09:09 AM.


Powered by vBulletin® Version 3.6.9
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.