Flight Manual STEMME S6
Doc.-No.:P400-006.000 E Page: 3-36 Revision: ---
Date of Issue: 07. October 2008 Agency approved Date of Rev.: --.--.----
3.12.1.18 Loss of Propeller-Pitch-Control
During flight, the pilot must check the RPM continuously. If the RPM changes
unintentionally (during flight over a strong electro-magnetic-transmitter or by a
malfunction of the pitch-control), the following procedure is recommended:
Unintentional pitch-changes, RPM-variation in the „AUTO“-position or
malfunction of the automatic pitch-control:
1.
REDUCE THROTTLE immediately to avoid exceeding maximum
2. Set left propeller-switch to MANU - the Constant-Speed-Control is not
working now, control the propeller manually.
3. Control the RPM with the right propeller-switch:
HIGH RPM (START) = low pitch / high RPM
STOP = constant pitch / constant RPM
FEATHER = high pitch / low RPM
Warning: With the Constant-Speed-Control not working the RPM
changes with the airspeed. Correct the propeller-pitch
manually when changing the airspeed.
When changing to higher airspeed, there is the danger of
exceeding the maximum allowed RPM, when not correcting
the propeller-pitch in the FEATHER direction to the desired
RPM.
4.
For LANDING set the right propeller-switch to HIGH-RPM. The
propeller changes to the START position (green propeller-start-
indicator-light goes ON). If the propeller does not change to the
START position (green propeller-start-indicator -light is OFF), reduced
power and rate-of-climb for a go-around must be expected.
If the propeller can be properly controlled manually after a malfunction of the
Constant-Speed-Control, the flight can be completed with manual propeller
control. The malfunction of the Constant-Speed-Control must be repaired before
the next flight.
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