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Date:  3-28-2015
Number of Hours:  5.00
Manual Reference:  Section 7
Brief Description:  Left Wing Tank Brackets

I took seven T-712 brackets for the left wing and marked them as "root" and #1 - 6 to identify their positions on the spar. I also put tape on the spar and marked the locations. Next was orienting the brackets as per the plans and marking them. I marked centerlines and marked the center of each bracket on the spar side. I then offset the root bracket hole 1/32 inch away from the bracket web for socket clearance. I offset the mark on bracket 1 - 5 (root toward tip) by 1/32 toward the web for additional clearance when pop riveting these brackets to the tank baffle. The end bracket, #6, will have solid rivets and I used the exact center for this bracket. Drilled the center hole on each bracket, deburred, and bolted them to the spar. Used a square to set each bracket and double checked using the centerlines that were visible through the spar holes. Used the spar and a wood block as a drill guide and drilled one hole to #12 and inserted another bolt, then drilled the third hole through the spar. Repeated this process for brackets 2 - 6. I had already installed the nutplates on the spar for the root bracket, so I bolted the bracket, squared it up and used a #25 drill through the nutplate to make a pilot hole. Removed the bracket, drilled the hole full size and reinstalled the bracket with two bolts. Repeated the process for the third hole. Deburred all holes. Bolted nut plates to each tank bracket, drilled one ear and inserted a cleco, then drilled the other ear. Counter sunk the mounting holes and riveted on the nut plates.
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Begin left wing brackets

Begin left wing brackets

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Drill second hole

Drill second hole

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Rivet nut plates

Rivet nut plates

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