With two exceptions, all the components that attach to the flaperon spar were attached using solid rivets in place of LP4-3 pop rivets. The assembly order of the components was also changed to facilitate the use of the pneumatic squeezer. Riveting the actuator bracket requires care because the rivets are VERY close to the actuator’s web. Suggest placing the factory head of the AN470AD4-6 rivets on the spar and forming the shop head on the actuator using a SMALL diameter rivet set … if a large rivet set is used, it will gouge into the actuator’s web because the clearance is very tight.
Riveting the flaperon’s actuator bracket onto
the left flaperon spar with the pneumatic squeezer.
Riveting the inboard A-1205 aft rib onto the actuator/spar
assembly with AN470AD4-6 rivets.
Riveting the inboard nose rib onto the left flaperon
spar with AN470AD4-4 rivets.
The two pivot brackets were riveted onto the left
flaperon spar using AN470AD4-4.5 rivets.
Counterbalance nose rib riveted onto left flaperon
spar with AN470AD4-4 rivets.
The two locations that have a nose rib and aft
rib sharing the same rivet holes in the flaperon spar proved problematic for
the pneumatic squeezer … the far outboard rib location and at a point approximately
one third in from the inboard edge of the flaperon. It was easy to set a solid
rivet in the center hole of the outboard pair of ribs … however, the upper and
lower holes proved problematic because the body of the squeezer was hitting the
aft rib and not able to get directly square on the rivets so LP4-3 pop rivets
were used.
To allow for a solid rivet to be set in the ribs
at the point a third of a way in from the inboard portion of the flaperon, the aft
A-1205 rib was flipped around so the direction of the web on the aft rib
matched the direction of the A-1210R nose rib’s web. This allowed the pneumatic
squeezer access to set a solid rivet in center rivet hole. Flipping the A-1205 rib
poses no assembly problems because the rivet holes in the aft ribs are
totally symmetrical.
One of the two locations where a solid rivet was
set in the center rivet hole where a nose rib and aft rib share the same holes
in the left flaperon spar … upper and lower holes have LP4-3 pop rivets.
Completed flaperon skeleton assembly with the
exception of the counterbalance
which will be installed after the aft skins in
the foreground are riveted in place.