m100psi Posted February 16, 2023 Report Share Posted February 16, 2023 Hi all, I'm currently getting new insulation installed in my '78 J. The shop doing it is concerned if they use the aluminum-backed insulation, they'll need to degauss afterward which in the past they've found to be time consuming. Just wondered what experience others have with this? Is degaussing typically part of the process when you carry out SB208? Or do others use another type of insulation without aluminum? Thanks, Matt Quote Link to comment Share on other sites More sharing options...
Guest Posted February 16, 2023 Report Share Posted February 16, 2023 It must be special aluminum if you can magnetize it. It’s also the wrong material to use. Look up SBM20-208 Quote Link to comment Share on other sites More sharing options...
PT20J Posted February 16, 2023 Report Share Posted February 16, 2023 I'd ask them why they don't have to degauss the entire aluminum airplane Clarence is right, aluminum is not ferromagnetic. Quote Link to comment Share on other sites More sharing options...
EricJ Posted February 16, 2023 Report Share Posted February 16, 2023 Why would they think degaussing would be necessary? Tell them not to use electric tools when they put it in. 1 Quote Link to comment Share on other sites More sharing options...
ArtVandelay Posted February 16, 2023 Report Share Posted February 16, 2023 We’re surrounded by a steel cage, the non ferrous metal backing of the insulation is the least of your worries. Quote Link to comment Share on other sites More sharing options...
Greg Ellis Posted February 16, 2023 Report Share Posted February 16, 2023 Maybe time to find another shop.... 1 Quote Link to comment Share on other sites More sharing options...
Mark89114 Posted February 16, 2023 Report Share Posted February 16, 2023 Plastic screwdrivers only will help. 1 Quote Link to comment Share on other sites More sharing options...
LANCECASPER Posted February 17, 2023 Report Share Posted February 17, 2023 22 hours ago, m100psi said: The shop doing it is concerned if they use the aluminum-backed insulation, they'll need to degauss afterward which in the past they've found to be time consuming. "Intelligence has its limits .. unfortunately Stupidity doesn't" Albert Einstein Either they really are that stupid or they are trying to degauss your wallet 2 Quote Link to comment Share on other sites More sharing options...
m100psi Posted February 17, 2023 Author Report Share Posted February 17, 2023 Thanks all for the feedback. A MSC found the insulation kit associated with the SB…for $750. Quote Link to comment Share on other sites More sharing options...
PT20J Posted February 17, 2023 Report Share Posted February 17, 2023 14 minutes ago, m100psi said: Thanks all for the feedback. A MSC found the insulation kit associated with the SB…for $750. If you are taking the entire interior out, you might consider replacing all the fiberglass with this foam. I bought it from OasisAero, the MSC in Willmar, MN that had a quantity of it in bulk. Even though Mooney replaced the side panels with foam, it continued to use fiberglass in the ceiling and baggage compartment. The foam is much better insulation for noise and temperature. 2 Quote Link to comment Share on other sites More sharing options...
m100psi Posted February 18, 2023 Author Report Share Posted February 18, 2023 Thanks for the tip. I’m not planning to remove the ceiling panels, but I’ll call them to see if it’s a more reasonable solution than the kit. Quote Link to comment Share on other sites More sharing options...
carusoam Posted February 18, 2023 Report Share Posted February 18, 2023 Putting in proper insulation can’t possibly require degaussing an airframe… Unless the shop intends to bring the industrial vacuum cleaner into the cockpit to clean up after the work… Large electric motors have been known to magnetize things nearby…. If you have done compass turns… and there is a heading that the compass hangs on….rests a moment… then accelerates to catch up… this is a sign of a magnetized cage… PP thoughts only, not a mechanic… Best regards, -a- Quote Link to comment Share on other sites More sharing options...
larrynimmo Posted February 18, 2023 Report Share Posted February 18, 2023 Perhaps an extensive use of steel fastners to reattach your interior panels Quote Link to comment Share on other sites More sharing options...
A64Pilot Posted February 18, 2023 Report Share Posted February 18, 2023 Only thing I’ve ever seen to magnetize a 4130 airframe is welding, and yes De-gaussing is a pain, but if you can access the tubes it’s not that bad. You use a big electromagnet and just move it around and use a little cheap needle gauge to verify the lack of magnetism. Gauss meter maybe? Looked just like this https://www.bergeng.com/product/MF-2480.html?gclid=Cj0KCQiAi8KfBhCuARIsADp-A55fbOKEXnqbWdHNdqRx5nKdGaCdApBzqwcJuHlUk9SDbS4cKFzc5dUaArGPEALw_wcB This meter and the fact the compass won’t swing will tell you if de-gaussing in needed, but without welding I’d be real suspicious. We had to de-gauss maybe 1 in 10 aircraft we manufactured when I couldn’t get the compass to swing Quote Link to comment Share on other sites More sharing options...
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