I'm searching for information on where the criteria of 15 minutes come from, in which the firewall is subjected to by a flame of 2000 °F (according to the now-obsolete 14 CFR 23.1191).

I know that this time includes mainly a reaction time. This reaction time is the time from the appearance of a fire in a compartment to the fire being recognized by the pilot.

Can anybody provide more information about the 15 minutes?

  • $\begingroup$ Most likely a time considered to take from the start of the fire, noticing it, shutting off fuel, and burning off the fuel already delivered to engine, plus added safety margin of some minutes (30% maybe). $\endgroup$ – Jpe61 Feb 24 at 9:52
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    $\begingroup$ I suspect that this criteria is part of the rules which are not "computed" but rather decided based on experience and various non-analytical considerations. $\endgroup$ – ocirocir Feb 26 at 14:48
  • $\begingroup$ You might be able to dig it out of the federal register. It might also be a carryover from the CAB rules that precede the regulations in CFR Title 14. $\endgroup$ – Jabirhee Mar 7 at 15:02

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