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Old 7th Feb 2020, 12:46
  #508 (permalink)  
megan
 
Join Date: Mar 2005
Location: N/A
Posts: 3,218
gulli, re fireproof the FAA merely defines it as,
Fireproof—

(1) With respect to materials and parts used to confine fire in a designated fire zone, means the capacity to withstand at least as well as steel in dimensions appropriate for the purpose for which they are used, the heat produced when there is a severe fire of extended duration in that zone; and

(2) With respect to other materials and parts, means the capacity to withstand the heat associated with fire at least as well as steel in dimensions appropriate for the purpose for which they are used.
The catch is,
1.1 of the FAR provides general definitions for the terms "fireproof" and "fire resistant," these definitions do not specify heat intensity, temperature levels, duration (exposure time), or an appropriate wall thickness or other dimensional characteristics for the purpose intended. With the advent of surface coatings (i.e., ablative/ intumescent), composites, and metal honeycomb for acoustically treated ducting, cowling, and other components which may form a part of the nacelle firewall, applicant confusion sometimes exists as to how compliance can be shown, particularly with respect to the definition of "fireproof" and "fire resistant" as defined in 1.1
The following 1990 document provides guidance, and defines fireproof as,
The capability of a material or component to withstand, as well as or better than steel, a 2000F flame (+15O'F) for 15 minutes minimum, while still fulfilling its design purpose. The term "fireproof," when applied to materials and parts used to confine fires within designated fire zones, means that the material or part will perform this function under conditions likely to occur in such zones and will withstand a 2000F flame (2150F) for 15 minutes minimum
https://www.faa.gov/documentLibrary/...r/AC20-135.pdf

What firewall "fireproof" means in the S-76 would have to be answered by SK..
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