Jabiru J450, Руководство конструктора

Страница: 169 / 343

Jabiru J450 Constructors Manual
Pre-Paint>Wings>Fit quick drain sumps
Tuesday, April 6, 2010 169 of 343
Pre-Paint>Wings>Fit quick drain sumps
Objectives of this task:
To flock the quick drain sumps into the wing tanks at the rear of each wing root and then
clean and seal the fuel tanks.
Materials required:
Epoxy resin and flock
Card # 11 „
Fuel components
‟
Mark and drill the wing
Turn the wing upside down and wedge the wing so that the top surface is level and solid.
If you have a compressor and an air line with a variable flow valve you could place a line into
the tank through one of the wing root fittings and
very slightly pressurise the tank, but be
careful to only use a small amount of pressure – too much pressure may rupture the tank!
Otherwise you could have someone hold a powerful vacuum
cleaner nozzle near the hole saw while you are drilling, but
whatever you do make sure that
no waste falls into the tank.
Measure 130mm in from the wing root and mark a line, then
measure forwards 65mm from the front of the rear wing lug
and mark another line. Where these lines cross is where the
quick drain sump will be fitted.
Now we can drill through the outer surface of the wing with a
hole saw, clean away excess filler and then drill a smaller hole
into the wing tank.
Drill a 1¾” hole into the outer wing surface
only , and not into the fuel tank.
Hold the drill at right angles to the wing surface and very gently drill until you can see
darkness at the bottom of the cut: this will mean that you have reached the gaps in the
expandable filler between the wing surface and the fuel tank.
Lever out the cut-out piece and carefully grind away all of the filler until you reach the
surface of the wing tank, then drill a 3/8” hole into the tank, taking care not to drop anything
into the tank. You could turn the wing right side up for this step if you wish.
In these photos, taken in our factory, the tank has been slightly pressurised so that all waste is
blown away from any opening, but a vacuum cleaner hose held close to the surface being cut
could achieve much the same result.
Rear lug