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Date:  8-4-2007
Number of Hours:  8.00
Manual Reference:  7-2
Brief Description:  Started countersinking wing main spars

Machine countersunk the main spars for the tank skin attach platenuts (#8 Screws).

We used a long piece of aluminum flat stock clamped to the inside of the spar flange as a guide for the countersink pilot. After match drilling the flat stock on the first flange it could be used on the other three by simply turning it around or upside down.
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Machine countersinking spar

Machine countersinking spar

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#8 platenut attach holes

#8 platenut attach holes

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60 #8 platenuts per spar!

60 #8 platenuts per spar!

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