On Monday, July 22, 2019 at 6:39:11 AM UTC-4, gregv wrote:
Hello, I fly a 1979 Nimbus 2 carbon, and since a few years I hear a cracking noise behind me. That noise occurs more often after a few hours of flight, maybe related to temperature change with altitude. You can hear the cracking noise in this video:

https://www.youtube.com/watch?v=pke-...ature=youtu.be

Did you already hear that noise? how do you think I can fix this ? do you think it is dangerous?

Thank you for help and advice

The sound does not seem to me to be the usual lift pin type noise. I could not associate with apparent changes in loading of the ship.
For the heck of it I'd look for something in the ventilation system.
UH