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Jabiru J450 Constructors Manual
Post-Paint>Fuselage>Assemble instrument panel
Tuesday, April 6, 2010
206 of 343
Lay the panel face down on a soft surface and fit the earth busbar over the back of the circuit
breakers. Fit the switches though the earth busbar and though the panel. Each switch has 2
retaining nuts: one nut will remain behind the panel and be used to tighten the switch in place
and the other nut will be fitted to the front of the switch on the panel face.
Each 2-way switch is labelled on one side with the direction of the OFF and ON positions.
All 2-way switches follow the convention of UP = ON and DOWN = OFF which means that
for most switches the machined groove in the threaded barrel of the switches will face
downwards. The Magneto switches will be the opposite, where the DOWN position will
connect the magneto to earth while the UP position will remove the earth and make the
magnetos live. Accordingly the magneto switches will have the groove facing upwards.
The 3-way flap switch should be fitted with the groove facing downwards.
Place all the switches into the panel and tighten the front nuts finger tight, then check that
each nut is flush with the end of the threaded barrel. Adjust the rear nuts to suit.
Lay a metal ruler along the bottom flats of the front retaining nuts as shown above and gently
adjust each nut until all the flats are in line, then use a spanner to tighten the rear nuts firmly.
Recheck each switch for alignment and make any final adjustments that may be needed.
Drill through the 2 mounting holes in the earth busbar between the circuit breakers and bolt
the busbar to the panel with 2 M4 screws and Nyloc nuts (shown circled above). Don‟t tighten
the nut closest to the centre of the panel just yet (shown as the right hand nut above); the
master earth will fit under this later during the wiring process.