SHB 803 en – Edition 2.4 * 803s410.fm 4-19
Engine
4.18 Altitude-dependent output reduction
This engine is equipped with an altitude-dependent output reduction to prevent the forma-
tion of black smoke a higher altitudes (fine particulate pollution).
Engine output is reduced when the engine is started at altitudes over 800 m (2624'-8'')
above sea level.
Control unit 20/A of the altitude sensor controls the output-reduction magnet of the engine.
Controlling in intermediate steps is not possible!
The control unit measures the altitude about 4 seconds after the engine is started.
The output-reduction magnet (normal operation) 21/B is de-energized at an altitude of
over 800 m (2624'-8'') = output reduction.
No further modifications are performed as long as the engine runs. A new measurement is
only performed if the engine is restarted.
Fig. 20: Control unit of altitude sensor
A
Fig. 21: Output-reduction magnet
B
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