DonFromTX
Well Known Member
A friend was having some problems with a rumbling sound, seemingly affected by airspeed and speed of the engine. He finally traced it down to the floor right and left of center line, just behind the baggage bulkhead! I found that I could touch either side on mine lightly and the other side would oil can - badly! We fixed this quick and simple by riveting on an angle to the center of each side, if you look closely at the attached photo, you can see the fix. This is a photo taken from under the seat area looking backwards.
[/IMG]