Jabiru Aircraft
Pty Ltd
Installation Manual
Jabiru 3300 Aircraft Engine
REVISION
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Dated : 1
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Dec 2016
Page: 31 of 56
5.5.2
Carburettor Tuning
The mixture supplied to the engine by the carburettor is affected by a large number of variables, including:
i.
Ambient temperature
ii.
Propeller size (coarse or fine) and loading
iii.
Whether the engine is cowled or open (by affecting the temperature of the induction pipes and
carburettor)
iv.
The airframe type
v.
The intake system
Because of these factors, we recommend that whenever a new engine installation is being developed that
the engine be fitted with EGT probes and the tuning checked.
Jabiru Aircraft or our local representative can provide assistance during this phase.
5.6
Fuel Lines
Fuel lines are nominally 6mm bore.
All hoses forward of the firewall require fire resistant sheathing (visible as an orange covering on the fuel
lines in Figure 28 above). Note that wherever possible the sheathing should be extended past the hose
clamp. The ends of the sheath must be held in place using safety wire to prevent the sheathing moving and
exposing the fuel line.
Fuel lines between moving sections such as between engine and firewall should be flexible. SAE standard
automotive rubber hoses are adequate, provided they are protected with fire resistance sheathing.
In many countries (including Australia) standard airworthiness requirements state that all flexible hoses must
be changed every two years, though if there are visible signs of degradation (such as cracking or hardening)
the hose should be changed immediately.