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Date:  7-8-2013
Number of Hours:  1.20
Manual Reference:  54-xx
Brief Description:  Drilled Stiffener Holes

Clecoed firewall stiffener spacers and firewall stiffiner to lower firewall hole. Installed AD426AD3-4 rivets to align spacers but did not press. Rotated stiffener into position at the top outer corner of lower firewall and match drilled (used Boelube). Removed stiffener and spacers and deburred. While deburring new holes on aft side of firewall, accidentally enlarged the 2nd to bottom hole. Was using a 3/16" drill bit with a 12" extension and was just tapping to holes to debur, but the bit was at an angle for the bottom hole, grabbed, and pulled through. Ordered oversized pop rivet (3/16") from Aircraft Spruce. We'll see how that works. (page 54-03, steps 2 and 3).

As mentioned in the entry on 7/7/13, decided to completely remove the F-1202N-R & -L fwd skin stiffeners so it was easy to remove the required area. Clecoed and match drilled firewall shelf (used Boelube) into F-1295-MOD-R & -L skin stiffeners. Removed and deburred, then reinstalled. Match drilled holes in F-1295-MOD-R & -L stiffeners into F-1270-R & -L fuselage side skins. (page 54-05, steps 1 - partial, 2, and 3).

Laid out rivet locations on outside of fuselage for F-1295-MOD-R & -L skin stiffeners, then match drilled. (page 54-06, step 1 - partial).
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Oversized Hole in Firewall

Oversized Hole in Firewall

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Skin Stiffener Match Drilled - Outer

Skin Stiffener Match Drilled - Outer

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Skin Stiffener Match Drilled - Inner

Skin Stiffener Match Drilled - Inner

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