Connections For Instrumentation; 1) Airbox Air Temperature Display (Only On 914 Series); 2) Boost Pressure Display; Carb Heat System And Winter Operation - Rotax 912 Series Maintenance Manual

2.10) Connections for instrumentation

■ CAUTION:

2.10.1) Airbox air temperature display (only on 914 Series)

2.10.2) Boost pressure display

2.11) Carb heat system and winter operation

The risks of carburetor icing are commonly known. The icing of air humidity in
the carburetor may be avoided by preheating the air.
◆ NOTE:
◆ NOTE:
◆ WARNING: Carburetor icing is a common cause of engine faults.
A further measure to reduce the risk of carburetor icing is to keep the water
content of the fuel low by proper handling. Also, install a generously dimensioned
water trap in the fuel system of the aircraft to prevent the formation of ice in the
fuel lines, filters etc.
Effectivity 912/914 Series
Edition 1 / Rev. 0
BRP-Rotax
Maintenance Manual
Also consult the instructions regarding the connection for
instrumentation in the Installation Manual.
A connection is provided in the airbox for measurement of the air
temperature . On the standard engines, this connection is closed by a
plug screw.
A connection is provided for an absolute pressure gauge in the
compensation tube for the indication of the boost pressure.
An airbox with a carburetor preheating flap is available for
engines of the 912 Series.
Engines of the 914 Series normally do not require any preheating
device as the intake air is preheated by the turbocharger.
Because of the heating up of intake air due to the boost process,
preheating of the intake air might not be necessary. But the
option of a change over for air intake from the engine compart-
ment is recommended as, for instance, the filter could be
blocked by icing.
Preheating of the intake air will result in loss of engine perform-
ance because of the reduction in air density.
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page 16
May 01/2007