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  #1  
Old 10-24-2018, 11:15 AM
greghughespdx greghughespdx is offline
 
Join Date: Nov 2011
Location: Aurora, OR
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Default RV-14/14A Service Bulletin SB 18-09-17 published: possible cracking of F-01478 skin

Vanís Aircraft has released a service bulletin for the RV-14/14A (SB 18-09-17) addressing possible cracking of the F-01478 ďAft Fuse Forward Bottom SkinĒ that may occur in flying aircraft. This service bulletin is applicable to all RV-14/14A aircraft empennage/tailcone kits shipped prior to September 26, 2018. It calls for inspection of the F-01478 skin in specific locations, and a modification in the event cracks are found. This inspection needs to be conducted at or before the next annual inspection, and then at each annual inspection until the modifications described in the service bulletin document have been completed.

The Vanís part number to order for the kit used to complete this change is Part no. SB 18-09-17. The cost for this kit is $10 plus shipping.
Iíve inspected my aircraft and did not find any cracks. Should I install this modification proactively?

Installation on an airplane that has not yet developed the described cracks is optional and at the discretion of the builder/owner. Note that for the affected aircraft kits, operation of the aircraft without this modification the aft fuselage bottom skin is likely to result in eventual formation of the described cracks, at which time the skin will need to be stopped drilled and the modification kit will need to be installed. Until the modification kit is installed, you need to conduct regular inspections as described in the service bulletin document. The cracking that may occur is limited in area and is primarily cosmetic in nature, rather than a structural issue. Due to the wide variety of flight conditions and operational characteristics between different aircraft, we cannot predict when the skin cracks may form for a particular airplane. Proactive installation of the modification kit is an acceptable method to prevent these cracks from forming in the first place.

My airplane has not flown yet. Does this service bulletin apply to me?

Yes. The service bulletin and modification parts apply to all RV-14 empennage/tailcone kits shipped prior to Sept. 26, 2018. If you have not yet assembled or flown your airplane and you received a kit that was shipped prior to that date, the service bulletinís instructions include a section that describes steps to follow when applying the update to affected aircraft kits which are under construction. For kits that were shipped after September 26, 2018 the updates are already incorporated into the RV-14 kit and related assembly instructions/plans; as such the service bulletin is not applicable to those kits.
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  #2  
Old 10-24-2018, 03:02 PM
mturnerb mturnerb is offline
 
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I reviewed the SB and ordered parts today. The only hard part will be getting back that far to drill and buck rivets, etc.
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  #3  
Old 10-24-2018, 04:10 PM
salto salto is offline
 
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Location: Wee Waa Australia
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The parts cheap enough.... The weight loss program is what's going to be expensive.. 😩
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  #4  
Old 10-24-2018, 04:49 PM
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bkervaski bkervaski is online now
 
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Anybody affected have pics of a crack so we know what to look for?
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Last edited by bkervaski : 10-24-2018 at 05:12 PM.
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  #5  
Old 10-24-2018, 05:00 PM
Bavafa Bavafa is offline
 
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Location: Sacramento, CA
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crawling back is not going to be that difficult, the rivets will be drilled out from the bottom and we only need to buck from inside, beside a couple of rivets which can be squeezed.
Put some plywood/moving blanket that you can put your weight on, lay on one side of the push/pull tube and buck. The backside of the bulkhead might be reachable from the empennage area.
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  #6  
Old 10-24-2018, 06:01 PM
MED MED is offline
 
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Quote:
Originally Posted by bkervaski View Post
Anybody affected have pics of a crack so we know what to look for?
Search oil canning. Tom Martin posted pictures in that thread a few months ago.
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Last edited by MED : 10-24-2018 at 06:03 PM.
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  #7  
Old 10-24-2018, 07:34 PM
mturnerb mturnerb is offline
 
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Quote:
Originally Posted by Bavafa View Post
crawling back is not going to be that difficult, the rivets will be drilled out from the bottom and we only need to buck from inside, beside a couple of rivets which can be squeezed.
Put some plywood/moving blanket that you can put your weight on, lay on one side of the push/pull tube and buck. The backside of the bulkhead might be reachable from the empennage area.
The drilling I was referring to was the match drilling of clips to bulkhead: Difficulty is proportional to age and mobility/size and I'm not exactly a spring chicken. I need a young, skinny person to help!
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  #8  
Old 10-24-2018, 09:55 PM
TASEsq TASEsq is online now
 
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Hereís the thread I think referenced below.

http://www.vansairforce.com/communit...d.php?t=161648

Itís interesting to note that the SB addresses the cracks on the lower (bottom) fuselage as shown in the thread, but doesnít address the location of the oil canning on the sides of the fuselage.

I wonder if the sides will also crack one day?
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  #9  
Old 10-25-2018, 06:01 AM
mturnerb mturnerb is offline
 
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Quote:
Originally Posted by TASEsq View Post
Hereís the thread I think referenced below.

http://www.vansairforce.com/communit...d.php?t=161648

Itís interesting to note that the SB addresses the cracks on the lower (bottom) fuselage as shown in the thread, but doesnít address the location of the oil canning on the sides of the fuselage.

I wonder if the sides will also crack one day?
The question to me is: does the oil canning need to be fixed? I'm currently flying a 38 year old Archer with 3K hours or so, and when I fly I can see the top wing skins distorting between rivet lines - presumably due to the effects of lift on the top of the wing. Not a crack in sight.

Is the flexibility of skin/structure that allows oil-canning to take place a normal/natural/desirable part of the design? Not a rhetorical question - I just don't know, thus the question I posed above.
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  #10  
Old 10-25-2018, 07:36 AM
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kbalch kbalch is offline
 
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I also ordered the SB parts yesterday. With my fuselage kit currently in crating, tailcone access will never be better. Good timing, for once... :-)
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