Thanks for digging up the reference Ken! I'll see what I can do. Right off the bat, the existing plans method for constructing our aircraft with .005 stainless doesn't meet Part 23 requirements in any regard...
-----Original Message----- From: KRnet [mailto:krnet-bounces at list.krnet.org] On Behalf Of Kenneth B. Jones Sent: Friday, March 14, 2014 9:14 PM To: KRnet Subject: Re: KR> Firewall material On Mar 14, 2014, at 11:18 PM, John Bouyea wrote: > Anyone make a reference as to what heat level/ temprature and duration is "approved" as a test? > 2000 degrees F for 15 minutes, per part 23. ?23.1191 Firewalls. (a) Each engine, auxiliary power unit, fuel burning heater, and other combustion equipment, must be isolated from the rest of the airplane by firewalls, shrouds, or equivalent means. (b) Each firewall or shroud must be constructed so that no hazardous quantity of liquid, gas, or flame can pass from the compartment created by the firewall or shroud to other parts of the airplane. (c) Each opening in the firewall or shroud must be sealed with close fitting, fireproof grommets, bushings, or firewall fittings. (d) [Reserved] (e) Each firewall and shroud must be fireproof and protected against corrosion. (f) Compliance with the criteria for fireproof materials or components must be shown as follows: (1) The flame to which the materials or components are subjected must be 2,000 ?150 ?F. (2) Sheet materials approximately 10 inches square must be subjected to the flame from a suitable burner. (3) The flame must be large enough to maintain the required test temperature over an area approximately five inches square. (g) Firewall materials and fittings must resist flame penetration for at least 15 minutes. (h) The following materials may be used in firewalls or shrouds without being tested as required by this section: (1) Stainless steel sheet, 0.015 inch thick. (2) Mild steel sheet (coated with aluminum or otherwise protected against corrosion) 0.018 inch thick. (3) Terne plate, 0.018 inch thick. (4) Monel metal, 0.018 inch thick. (5) Steel or copper base alloy firewall fittings. (6) Titanium sheet, 0.016 inch thick.
