09/11/2018
RANS S-21 OUTBOUND
TEXT MANUAL
94
BOOT COWL
IMPORTANT:
The strut tangs need to be drilled to 7/16" before the boot
cowl is fit up. See below.
1.
Locate long 3/8" and 7/16" drill bits.
2.
Drill the strut attach tangs to 3/8" from the forward side.
3.
Test drill a piece of scrap with the 7/16" drill. Test fit the bolt to ensure a tight fit
with no play. Once satisfied, drill the strut attach tangs to 7/16".
ASSEMBLY
(
NOTE:
Do NOT rivet the boot cowling to the fuselage cage until after
transfer drilling the tabs to the floorboard and installing the nut plates.)
1.
Refer to the parts catalog and select the required components for assembly.
2.
Apply masking tape to the bottom of the wing strut carry-thru (Station 2) and
mark the bottom centerline of the tube. This will become your reference line for
trimming the aft bottom edge of the boot cowl skin.
3.
Rivet the 3 pieces of firewall together per parts manual. Pin the firewall to Station
1 with two 5/16" bolts and center side to side. Transfer drill #30 through all tabs.
Use a wood block on the firewall side for support when drilling. Cleco as you drill.
Remove, debur, and apply Truck Bed Liner Spray to the backside of the Firewall.
4.
Pin and cleco the firewall back in place. Bend the small tabs into alignment with
the boot cowl side skins during assembly.
5.
Position Bottom Boot Cowl Skin flush with forward edge of the firewall flange.
Center side-to-side.
6.
When satisfied with fit transfer drill #30 through welded tabs on the fuselage. Use
a wood block on the Bottom for support when drilling. Cleco as you drill.
7.
Slip the Skin Stiffeners (aluminum angles) between the tabs and bottom boot
cowling skin. Refer to
FIGURE 10E-07
for position
ing. Place the 3/4” flange of
the Stiffeners against the skin. Do this by removing one cleco, transfer drill
through the aft tab, replace the cleco, swing forward end of Stiffener into place
after removing the other clecos. Transfer drill through all tabs. The Stiffeners are
provided a little long. Trim as needed.
8.
Locate and drill #30 holes approximately ever
y 2” between the tabs. Cleco from
the bottom, so they are not in the way of the floorboard.
NOTE:
The short flange of the stiffeners will need trimmed to clear
brake/rudder pedal mounting tabs.
9.
Trim as required. See
FIGURE 10E-08
.
