Flight Manual STEMME S6
Doc.-No.:P400-006.000 E Page: 3-32 Revision: ---
Date of Issue: 07. October 2008 Agency approved Date of Rev.: --.--.----
3.12.1.11 Sudden Rise of Manifold-Air-Pressure MAP and RPM
If the MAP and RPM suddenly rise and the yellow TCU-caution-light is
FLASHING, a malfunction of the turbocharger-control-unit is most likely:
1. Control RPM and MAP with throttle (red MAP-warning-light must be
OFF)
Recommended operating limits:
75% MCP
(MAP : ≤ 31 inHg, engine speed ≤ 5000 RPM)
2. The waste-gate is possibly closed. Lower engine-power must be
expected. With the waste-gate closed, MAP-control is only possible
If the MAP and RPM suddenly rise and the power can not be reduced with the
throttle, the throttle-cable is most likely broken. The power-setting rises by
spring-load to 115% full-throttle.
It is recommended to climb to a safe altitude for changing to the glider-
configuration and landing on a suitable airfield. Then TURN OFF the engine:
At safety-altitude: fuel-shut-off-valve
After engine stops: Ignition
6. After the engine has cooled down: change to glider-configuration (see
section 4.7.3.2) and land in glider-configuration.
Warning: If the engine is restarted with the carburators set to full-
power, the drive-section might be severely damaged.
Caution: If allowed engine-limits are exceeded, when the red MAP-
warning-light is ON or FLASHING, or when the yellow TCU-
caution-light is flashing, this must be documented by the pilot
in the A/C-logbook with details like: nature of incident, date,
duration and the degree of exceeding.
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