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I have thermal fuses on my firewall in FRONT of the
blanket. IIRC, they are 390 degree fuses. The idea is that a flame in that area
would trigger a fuse quickly, alerting me long before heat gets to the F/W
itself. There would seem to be a reasonable chance in this situation to alert to
the fire, shut off fuel, and get down before a self-sustaining fire would be
underway. Perhaps I could even save the A/C so as to make it
repairable.
Ted Noel
N540TF
----- Original Message -----
Sent: Sunday, December 20, 2009 7:37
PM
Subject: [LML] Re: Firewall
It occurs to me that the thermal fuses
could be mounted against the firewall, under the firewall blanket. They're not
much larger than resistors and distributing them around the
firewall would give an indirect engine fire indication and would also
guard against the situation that Brad Simmons discovered. 144 dC fuses are
available at Radio Shack, and would fail at 291 dF. This is slightly above the
prepreg cure temp of 270 dF that Lancair mentions for the Legacy. They
imply the other models are cured under the same conditions but the
factory should be able to confirm that.
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