Fire systems
Posted: Sat Feb 18, 2012 12:04 am
TWO inflight fires? Grant, you either live right or very wrong. Glad to
hear that you're still here to tell us about the experiences. Local photo
plane (C210) had a nose gear hydraulic hose fail, evidently on retract when
departing. Pilot became aware of the fire about 7 NM out, passing 4000'.
He elected to return to the field and pointed the nose at the runway. By
the time he got the plane on the ground, the fire had started to enter the
cabin, at his feet. Needless to say, he exited the plane REAL FAST. While
inbound, he was under the impression that it was gas that was burning, and
he temporarily shut the fuel off. When he realized that there were really
no suitable landing sites, he made the decision to take the chance of
turning the gas on again. He figured he had a chance of landing, with the
motor to get him there, as opposed to putting it down in a neighborhood.
Turns out the fire was fed by the hydraulic fluid being pumped by the gear
system that never shut down because it didn't see up-lock pressure. Moral
of the story is that, as Grant said, there are lots of things here that burn
real well and these things happen real fast, too.
Since we're on the subject, I've wondered for a long time about the
effectiveness of under-cowl extinguishing systems. Seems to me that the
volume of air going through the cowl is so large that dumping 10# of CO2 or
Halon would be futile. Am I wrong with this line of thought? CO2 is about
8 cubic ft. / pound, so we're talking about 80 cubic ft of inerting agent.
I'd guess this would go through the cowl exit in a second or two, which
can't do much. On the ground, I can see such a system being effective, but
in the air????? BTW, guys, don't even think about putting CO2 inside the
cabin. If you'd dump 10# of CO2 inside a nice snug cabin, you'll likely
never see the ground when you hit it. I understand that Halon is much
friendlier, in this respect.
Bill
----- Original Message -----
From: <BCairboat@aol.com>
To: <murphy-rebel@dcsol.com>
Sent: Friday, November 28, 2003 11:25 AM
Subject: Re: Windshield hanging over firewall lip - Rebel/Elite
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hear that you're still here to tell us about the experiences. Local photo
plane (C210) had a nose gear hydraulic hose fail, evidently on retract when
departing. Pilot became aware of the fire about 7 NM out, passing 4000'.
He elected to return to the field and pointed the nose at the runway. By
the time he got the plane on the ground, the fire had started to enter the
cabin, at his feet. Needless to say, he exited the plane REAL FAST. While
inbound, he was under the impression that it was gas that was burning, and
he temporarily shut the fuel off. When he realized that there were really
no suitable landing sites, he made the decision to take the chance of
turning the gas on again. He figured he had a chance of landing, with the
motor to get him there, as opposed to putting it down in a neighborhood.
Turns out the fire was fed by the hydraulic fluid being pumped by the gear
system that never shut down because it didn't see up-lock pressure. Moral
of the story is that, as Grant said, there are lots of things here that burn
real well and these things happen real fast, too.
Since we're on the subject, I've wondered for a long time about the
effectiveness of under-cowl extinguishing systems. Seems to me that the
volume of air going through the cowl is so large that dumping 10# of CO2 or
Halon would be futile. Am I wrong with this line of thought? CO2 is about
8 cubic ft. / pound, so we're talking about 80 cubic ft of inerting agent.
I'd guess this would go through the cowl exit in a second or two, which
can't do much. On the ground, I can see such a system being effective, but
in the air????? BTW, guys, don't even think about putting CO2 inside the
cabin. If you'd dump 10# of CO2 inside a nice snug cabin, you'll likely
never see the ground when you hit it. I understand that Halon is much
friendlier, in this respect.
Bill
----- Original Message -----
From: <BCairboat@aol.com>
To: <murphy-rebel@dcsol.com>
Sent: Friday, November 28, 2003 11:25 AM
Subject: Re: Windshield hanging over firewall lip - Rebel/Elite
otherWalter Hello
In flight fires happen a lot more often than one might think.
I have had two, one from a cracked fuel filter on an ultralight and the
until thisin a piper warrior from the cabin heat which set the carpet on fire in the
aircraft. You have no idea of what wanting to get on the ground means
is putoccurrs. What is more important fuel is not the only combustible under the
cowling. If you over heat an engine and have a catastrophic failure, that
Thana rod through the case or just blow the casing off a pluged oil filter.
burnsyou have seven or eight quarts of boiling oil to burn. Hot engine oil
igniter.way better than gasoline and a glowing exhaust stack makes an excellent
CO/2I take cowling fire seriously enough to consider installing a home-made
butdump into the cowling. Not only do you have to remove the oxygen and fuel
allyou have to cool things down below flash point as well. I am sure we have
fireseen burnt cars and trucks on the side of the road as a result of engine
WalterI know if you have driven over the connector to Kelowna in the summer
theyou have seen them too. Every weekend someone burns their vehicle up on
grosshill climbing out of the valley. Climbing out of a high lake on floats at
*-------------------------------------------------------------------------*weight has the same potential if not more as vehicle cooling systems are
superior to a tightly cowled aircraft.
Grant.
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