unclear to me

[peter houpt]

Step. 1. MKS W-1207B Rear Spar Doubler Plates at the locations for CS4-4 rivets and the three locations called out in Figure 2.

In Figure 2 it is instructed to MCHN CSNK flush aft side


But that is strange. The aft site of the whole construction is the W-1207A itself. Later on the ribs are attached there.

What is meant by this? Can I just countersink the 3 holes at the same side as the other holes on the rear spar doubler plate

 

[daveyator]

Aft refers to the side that faces the rear of the aircraft, not the other side of the part in question.
Does that help at all. I found following RV12 plans to the letter is the best policy.
Cheers DaveH

 

[mbell]

Also note that the most inboard of the 3 extra countersinks is into the W-1212, not the doubler.

 

[peter houpt]

thank you

Sometimes it is just a problem of English (American) translation