Howdy,
Page 8-04, Step 6: Machine countersink the middle nine holes (shown in Figure 1) in the top and bottom flanges of the HS-00902-1 Front Spar for AN426AD3 flush rivets.
Page 8-08, Step 4: Machine countersink, for dimples in .025 thick skin, the #40 holes in the flanges of the HS-00902-1 Front Spar and HS-00903-1 Rear Spar that correspond to the HS-00901-1 Skins
The bold underlined directions are confusing to me..... What is the difference between a countersink for an AD3, and a #40? Wouldn't these be the same?
Page 8-04, Step 6: Machine countersink the middle nine holes (shown in Figure 1) in the top and bottom flanges of the HS-00902-1 Front Spar for AN426AD3 flush rivets.
Page 8-08, Step 4: Machine countersink, for dimples in .025 thick skin, the #40 holes in the flanges of the HS-00902-1 Front Spar and HS-00903-1 Rear Spar that correspond to the HS-00901-1 Skins
The bold underlined directions are confusing to me..... What is the difference between a countersink for an AD3, and a #40? Wouldn't these be the same?