Today's Message Index:
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1. 03:28 AM - Re: Stall Warning System (Thom Riddle)
2. 09:08 AM - Re: gear leg cracks (Thom Riddle)
Message 1
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| Subject: | Re: Stall Warning System |
--> Allegro-List message posted by: Thom Riddle <jtriddle@adelphia.net>
Hugh,
Our Allegro has the stall warning system installed but we did not
install it. However, Frank Cuba, the dealer in Nebraska from whom we
bought ours did either a replacement or repair of the stall warning
system on our airplane just before we bought it. I'm sure he knows the
details of how it goes together and has always been helpful to us. I
would contact him and tell him I suggested it. He is on Matronics List
so you should be able to get his email there. If you don't find it, let
me know off list and I'll send you all his contact info.
Thom in Buffalo
Message 2
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| Subject: | Re: gear leg cracks |
--> Allegro-List message posted by: "Thom Riddle" <jtriddle@adelphia.net>
IMPORTANT UPDATE ON GEAR LEG CRACKS.
Upon removal of old gear legs, to install new ones, we found that there was a crack
on the upper surface of each gear leg where it makes contact at the entrance
to the fuselage gear leg socket. I'm attaching a photo below showing this.
I ground down the small 1" crack and determined it was only skin deep (through
the gel-coat only) on both legs. However, the longer (all the way across the leg)
cracks were more than skin deep. They went at least through the first layer
of cloth.
THESE BIG CRACKS WERE NOT VISIBLE WITHOUT REMOVING THE GEAR LEG CLAMPING BRACKET
AND MOVING THE GEAR LEG AWAY FROM THE FUSELAGE !!!
Please look for cracks at this location during your inspection. I would also recomend
taking a measurement between the gear legs at the axle and occasionally
check this distance to detect some sag in gear before failure. This should be
done at the same weight on each check. We are now doing it with the main tank
full but no occupants. If this distance gets larger, it could be an early warning
of impending gear cracks or complete failure.
My Opinion as to cause:
It appears that when the gear leg flexes, the stresses are concentrated where the
leg enters the fuselage gear socket, partly because there is a relatively sharp
edge where they come into contact with each other. In my opinion, there should
be a gap at this point so the leg can flex some before coming into contact
with this relatively sharp edge.
I am not a structural engineer but a retired mechanical design engineer and this
looks like a problem area to me. I have an idea of how to fix this but won't
post it here because I don't want anyone thinking that I am redesigning the Allegro
and I don't want any liability for others actions based on my ideas. You
can blame the lawyers for this.
PLEASE INSPECT YOUR GEAR LEGS at the fuselage entrance point.
--------
Thom in Buffalo
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=36970#36970
Attachments:
http://forums.matronics.com//files/original_rt_gear_leg__cracked2_677.jpg
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