73-00-00
page 16
May 01/2007
Effectivity 912/914 Series
Edition 1 / Rev. 0
d02623
BRP-Rotax
Maintenance Manual
2.10) Connections for instrumentation
â– CAUTION: Also consult the instructions regarding the connection for
instrumentation in the Installation Manual.
2.10.1) Airbox air temperature display (only on 914 Series)
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.
2.10.2) Boost pressure display
A connection is provided for an absolute pressure gauge in the
compensation tube for the indication of the boost pressure.
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.
â—† NOTE: An airbox with a carburetor preheating flap is available for
engines of the 912 Series.
â—† NOTE: Engines of the 914 Series normally do not require any preheating
device as the intake air is preheated by the turbocharger.
â—† WARNING: Carburetor icing is a common cause of engine faults.
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.
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.
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