Hum on landing

Problem appears to be solved. Turns out to be (I think) loose inspection port cover.

Ted

Oh, I must clarify, the stuffed toy is an aviation-grade stuffed toy, LOL. I have added it to the "required equipment" list and "weight and balance" for the aircraft.

Thanks, Ill try it out. I had vibrating windows before but stiffeners at the base cured the problem. Maybe it came back. Today I checked the cover plates on the bottom of the wing before I did a few touch and goes and found one out of kilter. No hum on these landings, so maybe that was it.

Ted

Mine vibrates as well sometimes on either side. I can sometimes move them a little bit and it'll quit otherwise I have a small piece of fabric that lays in the gap and cuts down on the vibration. I think it's caused by a certain frequency of harmonics. My have all of the correct stiffeners and It still happens

Chris

Try stuffing a small stuffed animal in the window gap to keep the window from moving. Mine started vibrating when I had new windows put in ( just my side). I'm thinking the new material was not as age hardened as the outgoing plexiglass. Also for some reason my left window has a smaller bottom aluminum channel than the other (non vibrating) side. Only vibrates at lower air speeds (take off and landing) which is super annoying. I need a thicker channel on the bottom of it, but for now the stuffed toy works. Could be in your case that certain window positions don't do it and you found one that did.