![]() ![]() Theoretically at least, that would give you enough time to get the airplane on the ground safely. As such a barrier, it ought to be capable of resisting the penetration of flames for 15 minutes. You should realize that your firewall is supposed to act as a flame barrier between the engine compartment and you in the cockpit. Although it is capable of withstanding temperatures of 500 to 600 degrees F., it, too, falls short of preventing flame penetration for any length of time. More recently, a high temperature red silicone adhesive has become commonly available at auto parts stores. Besides, the treatment is not fire resistant - far from it. This "better than nothing" solution usually results in a messy appearance. Unfortunately, bulkhead fittings cannot be used everywhere so builders continue to seal firewall openings with rubber grommets and dabs of silicone adhesive "frosting" around the wires, cables or controls passing through the firewall. ![]() Properly installed, bulkhead fittings do not need any further protection or form of sealant. It seems that most builders would prefer using those neat little rascals instead of sealing the firewall with a rubber grommet and some messy sealant.īecause of the difficulty builders experience in sealing the firewall, I can understand why most builders like to use bulkhead fittings wherever they can as the preferred way to pass plumbing through the firewall. Ever since the publication of my book, Firewall Forward, five years ago, I have been receiving countless queries asking for possible sources for the firewall shields/grommets illustrated on pages 64 and 66.
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