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  #1  
Old 12-22-2020, 05:00 AM
YankeeBravo YankeeBravo is offline
 
Join Date: Dec 2018
Location: Switzerland
Posts: 16
Default Tiny crack in fuselage skin, drill it or leave it ?

Good day, after rolling the mid side skin (F-1070) l observed a tiny crack above the relief notch, the crack is less than 1/16 of an inch long. Would you leave it as it is or drill a hole (1/16 or less) at the end of it ? Thanks in advance..
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  #2  
Old 12-22-2020, 05:43 AM
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rv8bldr rv8bldr is offline
 
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Hi Yannick

In my opinion you really need to stop drill that. I don't know if 1/16" is large enough to ensure it doesn't spread but it may be. Is that area under a fairing or anything? If so, I would be inclined to use a #30.

I'm sure others will chime in shortly with more (and probably better) advice :-)
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  #3  
Old 12-22-2020, 06:13 AM
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PaulvS PaulvS is offline
 
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Location: Western Australia
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Quote:
Originally Posted by rv8bldr View Post
Hi Yannick

In my opinion you really need to stop drill that. I don't know if 1/16" is large enough to ensure it doesn't spread but it may be. Is that area under a fairing or anything? If so, I would be inclined to use a #30.

I'm sure others will chime in shortly with more (and probably better) advice :-)
That sounds like sound advice, per AC43.13-1B 4-59 (a.) drill small holes 3/32 or 1/8 inch at the end to help stop the crack. Or, simply file out the crack with a small round needle file, the technical effect will be the same but it may look neater and more deliberate.
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Last edited by PaulvS : 12-22-2020 at 06:52 AM.
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  #4  
Old 12-22-2020, 11:42 AM
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plehrke plehrke is offline
 
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If you don’t stop drill, a tiny crack grows into a big crack. That is the only thing I remember from my material science class on the theory of crack propagation in college but probably the most important.
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Last edited by plehrke : 12-22-2020 at 04:04 PM.
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  #5  
Old 12-22-2020, 11:58 AM
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HAL Pilot HAL Pilot is offline
 
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I second that. It WILL grow.
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  #6  
Old 12-22-2020, 01:49 PM
Bavafa Bavafa is offline
 
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I would probably enlarge the relief area to include/capture the crack, will not leave it as it is.
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  #7  
Old 12-22-2020, 03:17 PM
YankeeBravo YankeeBravo is offline
 
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Thanks a lot, so i will definitely drill it or enlarge the relief notch as advised...
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  #8  
Old 12-22-2020, 06:31 PM
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rjcthree rjcthree is offline
 
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Default Recreate a relief

Id recreate a significant bend relief, going at least 0.03 deeper than the visible crack. Youll never see it later. 1/8 bit or better. Nice clean edges, please! Just a stop drill at this stage is ...correct, but incomplete, IMO. I might have a similar situation in my 9A....maybe.
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  #9  
Old 12-22-2020, 07:07 PM
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emsvitil emsvitil is offline
 
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Would a sheet-metal hole puncher work instead of a drill.

Just wondering if the hole-puncher would set up another failure mode.
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  #10  
Old 12-22-2020, 07:12 PM
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agirard7a agirard7a is offline
 
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Default Crack

I had a crack in the same spot exactly. Stop drilled it with 1/16 hole.
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