Effectivity: 916 i A / C24
Edition 0 / Rev. 1
BRP-Rotax Page 7-17
December 01 2023
Figure 14
Boost pressure
control
The compression rate of air is depending on the amount of ex-
haust gases passing the turbine side of the turbocharger. For
controlling this compression rate the waste gate has an impor-
tant role. If the wastegate is fully closed the complete flow of ex-
haust gases must pass the turbine. The more the wastegate is
opened, the less exhaust gases have to pass the turbine. The
waste gate is powered by the boost pressure from the compres-
sor. Pneumatic valves actuated by the ECU control the amount
of the boost pressure necessary to adjust the waste gate to
reach the requested boost pressure. The PCV, as well as
Wastegate, are normally closed
Over boost valve
In case of overboost conditions the overboost valve is opened
to relieve the excessive pressure.
Ambient Air Pres-
sure and Tempera-
ture Sensor
(AAPTS)
The two Ambient Air Pressure and Temperature Sensors
(AAPTS) are all-in-one sensors for engine ambient temperature
and engine ambient pressure. In cowled engine installations
they have to be mounted in the engine compartment in a ram
air free area and close to the air inlet. The sensors must meas-
ure the correct air inlet temperature and the air pressure right
before the air filter.
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