First thing on the agenda was to verify the quality of the wiring connections made thus far. The wires to the landing light’s Molex connector were verified with an ohm meter … continuity was tested to the electrical connector at the root of the wing and all connections were good. The cable for the navigation/strobe lighting was also buzzed out and all was well there too.
The flaperon bracket assembly is the last item
to be installed onto the left wing skeleton before the upper wing skins are
riveted in place. The first item requiring
riveting is the W-1216B-L hinge rib … when this rib is in place, it creates a TIGHT
fitting slot for the flaperon hinge bracket to slip up into.
Holding a flaperon hinge bracket which slides up
into the slot between the W-1210 rib and the W-1216B hinge rib.
AN470AD4-4 rivets were used to attach the rear
flange of the hinge rib onto the rear spar in place of LP4-3 pop rivets. The
top two rivets were easily reached with the pneumatic squeezer but the bottom rivet
was set with a rivet gun. The flaperon bracket was temporally skewed to make
access for the rivet gun. This kept the nice look of only AN470AD4 rivets visible
on the rear spar. Sweet!
Squeezing AN470AD4-4 rivets for securing the rear
flange of the W-1216B hinge rib onto the wing’s rear spar.
Using a rivet gun to set the bottom rivet of the
W-1216B hinge rib onto the rear spar.
Note: the flaperon bracket is skewed to
make access for the rivet gun.
The flaperon bracket assembly is normally
riveted in place with LP4-3 pop rivets but I wanted to try getting a few solid
rivets into the assembly. To that end, the pneumatic squeezer was only able to
reach the four rivets along the diagonal edge of the flaperon bracket. Using
the rivet gauge, it was determined AN470AD4-6 rivets were required.
Using a rivet gauge to select the proper sized
rivet for riveting the flaperon
hinge bracket assembly onto the W-1210 rib … an
AN470AD4-6 was perfect.
Setting AN470AD4-6 rivets into the flaperon
bracket. with the pneumatic squeezer.
The decision was made to NOT use a rivet gun to
set all the rest of the flaperon hinge bracket rivets because the rivet gun clearance
was not the best. The rivets are so close to the edge of the skin or rear spar
that an offset rivet set would be needed. But even with the offset set in the
rivet gun, there were still clearance issues preventing the rivet set from
resting squarely on the rivet heads … because of near by pop rivet shop heads.
So for fear of creating a mess, I used LP4-3 pop rivets in the remaining rivet
locations. But at least there are four solid rivets in the assembly and I like the thought of that.
Using a hand riveter to set LP4-3 pop rivets
into a flaperon bracket assembly ...
a piece of scrap metal under the rivet gun
will prevent primer scratches.
A finished flaperon bracket assembly with both
solid and pop rivets in place.