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l. Apply the plies and resin over the tapered and sanded area on the seat pan and on
the seat backrest from the cabin and baggae compartment side (Figure 02-001 part
3). Allow to cure for 8 hours at 56°C.
m. Sand all sides of the repair area and make them flush with the rest of the surface. On the
bottom side of the sat pan and on the seat backrest a light bulge can be left for additional
material strength.
n. Blow surface clean with compressed air, wipe away dust/debris with acetone and allow to
dry for 30 minutes.
o. From the cabin side of the seat pan and from the baggage compartment side apply rough
polyester kit and grind/sand down. Apply fine polyester kit and grind/sand down using
sandpaper no finer than P600.
p. Paint the newly processed cabin side seat pan surfaces with FIAT grey 025A acrylic paint
(Figure 02-001 part 4).
q. Sand down with P2000 sandpaper and polish with polishing disk.
Modification 3 – FUSELAGE BELLY INSTALLATION
a. Perform steps 20 to 53 in [4].
Modification 4 – UNDERCARRIAGE STRUT INSTALLATION
NOTE:
Selection of appropriate drill bits is critical in order to drill the main holes in the
undercarriage strut. Please refer to the diagram in Figure 04-002 entitled “Identification of drill
geometry” below. Be sure to select drill bits with a lip relief angle that is as small as possible
(<1o). This will ensure gradual feed and prevent wobbling of the drill bit. This will also prevent
the strut’s structure from being damaged. Feel free to sharpen/adjust the drill bit/lip relief
angle if need be.
a.
Begin by resting the fuselage right side up on the strut and making sure the strut is
oriented correctly (see Figure 04-002).
b.
Center it longitudinally and laterally using some cardboard spacers. Once centered,
use some tape or polyester resin to fasten it to the fuselage temporarily and ensure it
won’t shift out of place.
c.
Drill the fore port and aft starboard holes using an 8 mm drill bit and the holes
already drilled in the seat pan as a guide. Then temporarily fasten the strut to the
fuselage through these holes using two M8 bolts.
d.
Continue by drilling the aft port and fore starboard holes using a 10 mm drill bit.
e.
Apply silicone around the newly drilled holes on the undercarriage strut (Figure 04-
001).
