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Old 01-14-2022, 02:39 AM
gotyoke gotyoke is offline
Join Date: Jul 2020
Location: Placerville, CA
Posts: 158
Default Chapter 8: Can I take off the front spar caps to final-sized drill the doubler?

Chapter 8, page 4, step 4 says "Step 4: Except for those indicated in Figure 1, final-drill #30 the 1/8 [3.2 mm] holes common to the HS-00902-1 Front Spar and the HS-00907-1 Front Spar Doubler."

It does not mention the HS-00913 spar caps, which may still be clecoed on from Step 2 when the spar cap holes were already match-drilled to the spar. I'm inclined to remove the spar caps for this final-sized drilling to minimize the chance of accidentally making some of the holes oblong. Anyone see a problem with that?
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Old 01-14-2022, 06:08 AM
BravoAlphaRomeo BravoAlphaRomeo is offline
Join Date: Jan 2020
Location: Edgewood, KY
Posts: 38

My recollection is I left the spar cap cleco’d on for step four. The doubler and the spar caps only share a certain number of holes. I wanted to make sure that stack up was match drilled through. It is a tad confusing…
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Old 01-28-2022, 02:52 PM
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HAL Pilot HAL Pilot is offline
Join Date: Nov 2015
Location: Las Vegas NV
Posts: 368

Paragraph 3 of step 1 seems to talk about this. I added the underline.

Remove the spar cap, deburr the holes of the spar and spar cap, then cleco the spar cap back in place. It's important to deburr and clean out any chips, otherwise the spar cap will not fit
tight against the spar web when match-drilling the spar flange holes.

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