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Just conducting some research into materials used in construction for Boeing 747-400 and Douglas DC-3.

I just found out that in a DC-3 the floor panels in the main cabin and companionway are of plywood.

As such, I tried to find the information with regards to Boeing 747-400, but was unsuccessful.

I was hoping someone could provide me with information with regards to the material of the floor panels in the main cabin and companionway of Boeing 747-400.

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This illustration is earlier than a -400. Later ones might differ. There are two types: the normal one has aluminum skins bonded to a PVC core, for galleys/hold it is titanium skin bonded to a PVC core with greater strength/corrosion resistance.

enter image description here

747 cutaway view

Later a honeycomb sandwich was used, apparently two cross plied glass-epoxy prepreg skins bonded to phenolic coated nomex honeycomb core using an epoxy film adjesive. From:

Handbook of Adhesives and Sealants: volume 1, 2005

enter image description here

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    $\begingroup$ Thank you. That's what I was looking for. I wonder if the honeycomb structure was introduced into 747-400. $\endgroup$
    – Nauman Shahid
    Commented May 13, 2018 at 4:00
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I can't speak specifically of the 747, but most floors in airliners these days are carbon fibre sandwich with a nomex honeycomb core. Older ones may be fibreglass/nomex.

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