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-   -   SB 18-02-02 Potential cracking in the horizontal stabilator front spar (https://vansairforce.net/community/showthread.php?t=157839)

alexe 02-18-2018 04:02 PM

ExErcoupeGuy,
I just sent you a PM.
Alex

ExErcoupeGuy 02-19-2018 05:11 AM

Quote:

Originally Posted by alexe (Post 1240461)
ExErcoupeGuy,

Yes, the inspection itself is fairly easy to do. Once the stabilator is off the airplane, remove the the hinge brackets located on the front side of the stabilator spar. The service bulletin has good pictures of what to look for in that area, however, you will probably have to remove paint in the area with some fine sandpaper before you can really make a thorough inspection. Hope you don?t find any cracks so you can get your plane back home in a timely manner.

It take it that your airplane is a S-LSA, not an E-LSA?

Alex

N32SB is E-LSA. Has about 200 hours on it. Always hangared. Built in 2013 but didn?t fly much until my seller, a great Ret. AF General, bought it from the builder. The Gen. is beyond meticulous with his aircraft; e.g., all SB?s applicable were complied with by installation of Van kits obviating further inspection. This is exactly what I will do ? but since I?m in the field in Marco Island FL away from my Ohio shop (Rotax Certified and experienced in LSA, esp. RV 12?s Shamrock Aviation Services, Shane Young, in Delaware, OH) ? I will defer kit installs if inspection passes. I am very careful to cage the yoke and install rudder gust locks when it?s on a ramp and not hangared back home. Thank you so much for your advice and help.

joedallas 02-19-2018 10:15 AM

Before further flight ??
 
Before further flight ??

If you have less than 100 hours why would you need to check before further flight if it is OK to fly it for 100 hours after you check it ?

Unless Vans thinks that the crack may be associated with the bending process of the HS-1202 Spars ?

I think this is possible ?

If there is no cracks I wonder if the patch on top of the skin is necessary?
This will look like a Patch in my View.
Joe Dallas

rvbuilder2002 02-19-2018 11:12 AM

Quote:

Originally Posted by joedallas (Post 1240625)
Before further flight ??

If you have less than 100 hours why would you need to check before further flight if it is OK to fly it for 100 hours after you check it ?

Unless Vans thinks that the crack may be associated with the bending process of the HS-1202 Spars ?

I think this is possible ?

If there is no cracks I wonder if the patch on top of the skin is necessary?
This will look like a Patch in my View.
Joe Dallas

There are a lot of different things that could induce the repetitive loads that could cause cracking (a toddler sitting for hours banging the stick against the stops :rolleyes:, etc.) Since Van's has no way of knowing how the airplane has been treated regardless of the # of hours, it is specified that all be checked.
The premise is that if no cracking was induced during the first 100 hours, then it is likely that nothing serious would happen after another 100 hrs.

The patch on the top of the AST skin has nothing to do with the S.B. for the stabilator spar. They just happened to be published at about the same time.

I am pretty sure the AST S.B. is clear in saying that the skin doubler is only required if pre-existing cracks are found at inspection. Otherwise just the change in ribs is required.

alexe 02-19-2018 11:37 AM

Scott,

Regarding the stabilator SB, does the HS-01231C gusset (figure 4) fit beneath the skin or on top?

Thanks,
Alex

DonFromTX 02-19-2018 01:49 PM

I too am having some difficulty visualizing all this from the drawings.
Photos from the first people will be valuable.
Quote:

Originally Posted by alexe (Post 1240662)
Scott,

Regarding the stabilator SB, does the HS-01231C gusset (figure 4) fit beneath the skin or on top?

Thanks,
Alex


joedallas 02-19-2018 02:00 PM

Scott

Figure shows the patch on the top adding as shear connection to the hinge bracket , in my view

Joe Dallas






Quote:

Originally Posted by alexe (Post 1240662)
Scott,

Regarding the stabilator SB, does the HS-01231C gusset (figure 4) fit beneath the skin or on top?

Thanks,
Alex


Mel 02-19-2018 02:01 PM

Quote:

Originally Posted by alexe (Post 1240662)
Scott,
Regarding the stabilator SB, does the HS-01231C gusset (figure 4) fit beneath the skin or on top?
Thanks,
Alex

My interpretation is that both figure 4 and figure 8 clearly show the gusset to be on top of the skin. Also Step 27 states that no spacer is needed under the 2 inboard, aft rivets. If the gusset were to be under the skin, that statement would not be necessary.

rvbuilder2002 02-19-2018 02:32 PM

Quote:

Originally Posted by Mel (Post 1240691)
My interpretation is that both figure 4 and figure 8 clearly show the gusset to be on top of the skin. Also Step 27 states that no spacer is needed under the 2 inboard, aft rivets. If the gusset were to be under the skin, that statement would not be necessary.

Mel is correct.

rvbuilder2002 02-19-2018 02:37 PM

Quote:

Originally Posted by joedallas (Post 1240690)
Scott

Figure shows the patch on the top adding as shear connection to the hinge bracket , in my view

Joe Dallas

Since you weren't using part numbers I assumed you were talking about the doubler (patch) that goes over cracks on the antiservo tab (a different S.B.)

The doubler on the top and bottom of the stabilator is an important component for longevity and crack avoidance.

Call it a patch if you want, but it is a doubler.... just like all of the triangular doublers that are on the exterior of the fuselage belly.


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