How Much Carbon Fiber Goes Into Modern  

Has it all up in and around the C/b area.

First one we got had one of them brass alt static source pitot static switch toggle switches mounted incredibly close to buss bars up there on the copilot side of the aircraft.

That Switch was installed by the factory.  I was tasked at completion to look over the C/b pnl as a preliminary inspection before closing as lots of new wiring had been run and installed by our company for our needs.

I pointed out to my Lead that I did not like the clearance of the buss bar to the big honking back side of that brass switch and it was too close for me.  He kinda agreed with me but to get engineering involved and move the switch that the factory located was gonna be a headache. 

Well, weeks later they closed the panel anyway and were doing power on checks for the first time.  Suddenly someone hollered....hey....I smell something burning.  Sure enough, that Bar had made contact with the chunk of brass on the back of that switch.....that switch was mounted directly on Carbon Fiber.  Now carbon fiber has a low resistance to conductivity but it still conducts.  It was not a dead short enough to blow a current limiter but it was low enough to heat the surrounding carbon fiber and cause it to start cooking.....thus the burnt smell.

Needless to say, Agusta was notified and the switch was relocated on that aircraft and all the ones we received there after.

Story time over.

Go away now.