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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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 Posted: Sun Apr 23, 2006 8:11 pm Post subject: Interesting day at the airstrip |
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My test pilot had an interesting day flying today, and was lucky enough
to bring it home safely. He encountered a smell, like heated rubber, or
paint burning, while flying at about 2000' over the airfield. He
landed, we looked, and found nothing amiss. Thinking it was probably
the muffler losing its' "virginity" after 18 hours, he went up again,
flew some more and landed...no problem, we thought. Later on, he
noticed lack of power on takeoff, and aborted. I saw that the EGT span
was over 600 degrees F, and rising. This related to a lost cylinder in
my book. I switched the EIS to read all four exhaust gas temps, and
found that cyl. #4 on my Jabiru 2200 was the low one. Removing the cowl
we found 3 spark plug wires had come out of the distributor caps...2
wires to #4, and one wire to another plug on the other cap (2
distributor caps on the Jabiru). We plugged them back in, and all was
well again. He took off, and flew for another little while, then put
the plane away. Sitting back and thinking things over, I noticed one
"tail" pipe out of the muffler was missing. Pulling the upper and lower
cowling revealed that the exhaust heat was hitting the lower tubes of
the engine mount, cooking the paint off, and also had burned the outer
layer of rubber off the fire sleeve protecting the fuel supply to the
engine's mechanical fuel pump...this was at the firewall pass-through
fitting. When the new muffler is replaced, I will build a protective
shield to protect any future exhaust failures, as well as reinforced
tubing junctures, and a better hanging system to support any weight
that might be subject to vibration and subsequent failures.
I don't think that either incident had any bearing on the other, but in
retrospect, we should have pulled both cowls and given it a closer
going over...I damn sure will next time, and I'm happy to report that
there will be a next time.
This could have been a "bad day at Black Rock"
Lynn
Kitfox IV...Jabiru 2200
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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morid(at)northland.lib.mi
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| Posted: Mon Apr 24, 2006 7:15 am Post subject: Interesting day at the airstrip |
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That could have had some disastrous results Lynn, especially if you hadn't
used fire sleeve on the fuel line. This is one of those "I learned from
that..." things. Thanks for sharing with us and good luck with future
testing.
Deke
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Mon Apr 24, 2006 8:26 am Post subject: Interesting day at the airstrip |
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Thanks, Deke...hey, I could use some more pilots, so if you're
interested, there's still more hours to fly off. Of course, after
yesterday's problems, I may not get any takers on the offer to "come
here and fly free" : ) The muffler is going back to the Jab dealer and
he's sending me a new one today, so it will be ready for more flying in
about a week or less....with more safety/securing methods in place.
Lynn
On Monday, April 24, 2006, at 11:10 AM, Fox5flyer wrote:
[quote]
<morid(at)northland.lib.mi.us>
That could have had some disastrous results Lynn, especially if you
hadn't
used fire sleeve on the fuel line. This is one of those "I learned
from
that..." things. Thanks for sharing with us and good luck with future
testing.
Deke
---
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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