Aircraft Service Manual
Jabiru Aircraft
Pty Ltd
JTM001-1
J120, J160, J170, J200/J400, J230/J430, J250/J450 Variants
REVISION
1
Dated: Nov 2011
Issued By: SW
Page: 167 of 233
13.9 AIR INTAKE SYSTEM & CARBURETOR HEAT
13.9.1 DESCRIPTION
The engine air intake system comprises a cold air inlet in the lower cowl, a hot air muff attached to
the exhaust system, a mixer assembly mounted on the firewall and connected to a carburettor. The
mixer box incorporates the air filter, control flaps etc.
Carburettor Heat is activated by pulling the Carburettor Heat Control on the panel OUT. This opens
the hot air valve in the mixer assembly and permits hot air to flow from the muff into the carburettor.
13.9.2 REMOVAL, INSPECTION & INSTALLATION
To remove hot air mixed box the cable must be disconnected then the rivets holding it to the firewall
drilled. This is not required during routine maintenance.
To remove heat muff from the exhaust, undo the hose clamps holding it in position.
The air filter should be inspected every 100 hours or more regularly if the engine is operated in dusty
conditions. Dirty filters can be cleaned once by blowing out with compressed air
– when the filter
becomes dirty again it must be replaced.
Hot air mixer boxes must be inspected for conditions and to make sure they are clean and dry inside.
Ensure that the carby heat valve is operating correctly.
SCAT hoses must be inspected for condition and replaced if they are ripped etc.
Visually inspect the system looking for rubbing, wear, damage or corrosion.
For installation, reverse the procedure given above.
WARNING
Incorrect function of carby heat valve can lead to engine failure. Ensure flap of valve is securely
attached to shaft, moves with it correctly and seals when in position.
Figure 139
– Carburettor Heat Box
