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923te(at)cox.net
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 Posted: Thu Apr 06, 2006 3:35 pm Post subject: Aileron Flexing |
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One of the aileron Torque tubes on my Saber Tooth has a little groove in it
and I wonder if it needs replaced???
The groove is about .5" Long by .25 wide and is .014 at its deepest point.
It is about 16" from the tube end.
I anticipate flying regularly in the yellow arc..should I be concerned about
the 2000+ and 30 years of sress that has already occurred on th torque tubes
and the impact of this small gouge?
I understand that the only spec we have on the torque tubes is for wear. A
max of 0.030" wear is acceptable, and that is measured as TOTAL wall
reduction, so its not 0.030" on each side of the tube.
Bill Hatten are you the one that used to care for this Cheetah? 9715U Keith
Fuller used to have?
What do you think Bill, Gary?
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GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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| Posted: Thu Apr 06, 2006 10:23 pm Post subject: Aileron Flexing |
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In a message dated 4/6/06 4:36:46 PM, 923te(at)cox.net writes:
| Quote: | The groove is about .5" Long by .25 wide and is .014 at its deepest point.
It is about 16" from the tube end.
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Is this on the end near where it goes into the fuselage? It may have been
caused by the bolt that goes through the flap torque tube. That's pretty
common. You're allowed 0.030 inches deep. There are a few things you can do to
fix that. The inner-most aileron bearing support has an adjustment on the
screw holes. Make sure they aileron torque tube is as far away as possible.
Then, make sure you have enough shims (washers) under the special bolts on
the flap torque tube collar to keep the head of the bolt protuding more than
about 3 to 5 thousanths.
Gary
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_________________
Gary
AuCountry Aviation
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flyv35b(at)ashcreekwirele
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| Posted: Fri Apr 07, 2006 5:16 am Post subject: Aileron Flexing |
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Absolutely. This is very common damage which I have seen on most planes I
have inspected. Generally speaking the aileron torque tube is not centered
in the flap tube and collar and the shoulder bolts protrude through about
1/16" or so. You need a think AND a thin washer under the bolt head at
least. This can be inspected pretty well with a good flashlight and mirror.
The inner flap bearing bracket that attaches to the fuselage side wall also
has some movement compliance with the nuts loose and can possible be shifted
a bit to allow better concentricity with the aileron torque tube. This
usually is not necessary however.
I have dressed lots of aileron torque tubes that had a groove worn in them
by carefully filing the edges of the groove with a small fine file and then
blending and polishing the area with a scotch brite disc on a rotary 90
degree air grinder. This should remove any stress risers that might exist
as a result of a sharp edge groove.
Cliff A&P/IA
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