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pitts_pilot(at)bellsouth.
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 Posted: Sun Dec 23, 2007 4:53 pm Post subject: [ Edward Anderson ] : New Email List Photo Share Available! |
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Ed, those pictures are nasty!!! Glad the fire was contained there!
I've never seen tubing break like that, but then my 'sample' is
relatively small. Usually breaks occur radially around the tubing, not
linearly along the tube. My best guess would be a flaw in the tubing
... the jagged edge indicates it was brittle (or so I think). A more
interesting photo would be after the powder was cleaned up. Don't know
what dry chemical that is, but dry chemical of a few years ago was
terribly corrosive to aluminum, so you may want to inspect fairly often
'till you are sure there's no problem.
My hangar lease requires a dry chemical extinguisher .... and it's a
real dilemma for me to fight the fire or let it burn ..... either way,
down the road the plane would need extensive repairs due to the
corrosion and may become unairworthy anyway.
Linn
do not archive
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Ed Anderson
Joined: 10 Jan 2006
Posts: 475
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| Posted: Sun Dec 23, 2007 5:24 pm Post subject: [ Edward Anderson ] : New Email List Photo Share Available! |
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Hi Linn,
Yes, the powder was all cleaned up as you are correct that of a few years
ago was reportedly very corrosive to aluminum.
I also thought the break clearly indicated either side wall fatigue or
material defect. Its possible I may have work harden the tube while trying
to bend it in that loop around the axis.
The first "fire fighting" liquid was the remnants of a jug of antifreeze my
quick acting nephew threw on the burning wheels pant. Fortunately, the fire
did not heat it to its flashpoint - but it did suppress the external fire on
the wheel pant, long enough for my nephew to hop in his car drive to the
fuel pump area and return with their extinguisher. I had resigned my self
to the loss of the aircraft and was moving people away to a safe distance -
but fortunately the tire had not started to burn (although badly charred -
it never lost air) and a blast from the extinguisher under the wheel pant
put it out. None of the power was sprayed on the wing although clearly some
probably landed there.
You can still see the brake fluid leaking out by the tire on the ground.
My nephew was actually taking a video of my returned from the aborted take
off and caught the moment when the brake line completely failed and blew out
on the hot rotor and ignited. The fire ball rose up above the canopy - I
imagine it was when I made the last depression of the brake peddle. I did
not know I was on fire until stopped in the ditch and I popped my canopy.
I smelled the burning resin and immediately knew what it mean - and a
second later my nephew stuck his head in and confirmed it. He yelled "Uncle
Ed...Your' on FIRE!". It did nothing to lessen my speed of exit {:>)
Ed
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_________________
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com |
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AV8ORJWC
Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"
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| Posted: Sun Dec 23, 2007 7:39 pm Post subject: [ Edward Anderson ] : New Email List Photo Share Available! |
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On my hangar, the dry chemical or CO2 was for purposes of reducing
damage to the structure. The Lessor and State Fire Marshall could care
less about my aircraft.
Fire Annunciation and then Fire Suppression are two great topics. In
Oregon, there must be a water based hydrant within 250 feet of the
structure. Seems the Oregon Department of Aviation had been building
non compliant structures for years.
It could create a whole new thread.
John Cox
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wskimike(at)mchsi.com
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| Posted: Mon Dec 24, 2007 5:42 am Post subject: [ Edward Anderson ] : New Email List Photo Share Available! |
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I think you are confusing PKP, which used to be for brake fires on magnesium
wheel assemblies, which was very corrosive, with Co2 which is not anywhere
near as corrosive as PKP. If you use Co2 on those wheels, it would explode.
Now Halon is used.
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