I used steel fittings, standard AN960 flat washers, and steel AN924 nuts. One thing I would like to mention is that in order to keep the bulkhead fitting from spinning, you will need will need a backup wrench on the back side of the fitting. Be thinking ahead about how you are going to get a backup wrench on the back side while you are torquing the B-nut on the front side. Also, if you are going to install sound insulation on the aft of the firewall, that can block access. Like they say, PLAN AHEAD...what washers did you use?
Also, if you are going to install sound insulation on the aft of the firewall, that can block access. Like they say, PLAN AHEAD
Don't apply sound insulation to the cabin side of a firewall. Doing so creates a flame transfer system, defeating the reason for having a firewall in the first place.
That was prudent since you didn't know what the original builder used. The "Super Soundproofing" that ACS sells is flame retardant per FAR 25.853a Appendix F, Pt1. Whether that's good enough, I don't know (and hope to never find out). All I do know is that without the soundproofing, ATC was unable to reliably hear my transmissions due to the high cabin noise.I also did a burn test...
The "Super Soundproofing" that ACS sells is flame retardant per FAR 25.853a Appendix F, Pt1. Whether that's good enough, I don't know (and hope to never find out).
All I do know is that without the soundproofing, ATC was unable to reliably hear my transmissions due to the high cabin noise.
See my avatar.What were you flying?
See my avatar.