Chapter 3 -
Wing
3.6 - Fuel tank preparation
Page 10
anti-slosh valve. Drilling holes and other preparations are most successfully done on local
components prior to gluing.
3.6.1
fuel output
The fuel outlet uses a “finger” filter located in the lower back corner of the first rib.
It may be easier to install this filter on the loose rib before sticking it in place. Refer to
figure for location and procedure to install fuel outlet. If an injection mechanism is used,
check where a fuel return line is to be equipped. If so, this rib is also the appropriate place
for this line.
The innermost rib requires a rigid point for fuel outlet and other surface penetrations
as a measure of fuel level. The suggested material to be inserted into these parts is a ¼
inch aluminum sheet to provide a rigid, non-porous material for screws and fittings. Cut
out a 4 x 2,5 rectangle from the aluminum. De-shave all sharp corners, clean and rough
all surfaces thoroughly. Cut the rib side near the fuselage and clean the core material in
the hard spot area. Glue in place and fill final gaps with wet MICRO paste and cover with
2 layers of BID.
Any other penetration of fuel into the tank area through this rib or other locations
must perform similar techniques with enough aluminum insert to withstand the locking
forces. The phenolic or plywood inserts used at other mounting points would likely let a
small amount of fuel leak due to their porosity.
The fuel outlet hole must be drilled by piercing the casing and rigid point on the rib
5/8; from the top of the rib and 7/8; from the trailing edge of the rib. Drill and tap the tap
to thread as needed for the equipment.