Airplane Factory SLING 4
Pilot Operating Handbook
Page | 7-42
DC-POH-001-X-C-3
Revision : 1.3
7.23
Turbocharger Control Unit (TCU)
The applicable sections in the Rotax 914 UL operators manual should be
carefully read in conjunction with this section.
A throttle arm position sensor is mounted on one carburetor. The sensor
measures (throttle) position linearly from 0% to 115%, corresponding to
engine idle and engine full (100%) power respectively. The TCU
(Turbocharger Control Unit) utilizes throttle position in conjunction with
aircraft ambient pressure, airbox pressure, engine rpm and airbox
temperature to actuate an electronically controlled flap (waste gate) to
regulate the speed of the turbocharger / boost pressure in the engine
airbox.
The TCU starts adding full boost from the 108% throttle position onward.
The throttle lever (in cabin) is equipped with a detent at the 100% throttle
lever position. A lever on the throttle lever is activated to move the
throttle lever past the detent position to allow movement up to the 115%
throttle position. Note that 115% throttle position equates to 100%
engine power (full take-off power).
Relationship between throttle position and engine power
Throttle position
Engine power
115%
100%
Maximum 5 minutes!
(take-off power)
100%
85%
Maximum continuous power
NOTE
Throttle position from 108% to 110% result in a rapid rise in boost
pressure. Avoid constant throttle settings in this range, as it may result in
boost pressure control fluctuations (surging). To avoid unstable boost
pressure the throttle should be moved smoothly through this range to full
power (115% throttle position), or on a power reduction, to maximum
continuous power (100% throttle position).
Summary of Contents for SLING 4
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