m C0M~cH-E
C/R
I
PROPELLER
SYNCHROPHASER OPERATING PROCEDURE
The propeller synchrophaser automatically maintains both propellers at the same RPM and at a
preselected phase angle. This eliminates the propeher “Beat” effect and minimizes vibration.
The left engine is established as the master engine. The right engine is equipped with a slave governor
which automatically maintains its engine RPM with the left engine RPM.
The propeller synchrophaser switch is located on the lower left side of the instrument panel. It has
two positions, “MAN.” for manual or stand by and “Prop Sync.” for propeller synchrophaser.
For Taxiing:
Set the synchrophaser switch to “MAN.”
For Take-off and Landing:
Set the synchrophaser switch to “MAN.” “Prop Sync.”
can be used for or take off with no
adverse affect.
For Cruise:
Synchronize the propellers manually so that engine RPM’s are within 40 to 50 RPM of each
other, then set the synchrophaser switch in the “Prop Sync.” position.
NOTE
Normally, propeller synchrophasing is achieved in a few seconds
but occasionally it may take a full minute to achieve full propeller
synchrophasing.
If a change in power setting is desired, set the synchrophaser switch to “MAN.” position, wait 30
seconds. Adjust the ‘power setting, then set the synchrophaser switch in the “Prop Sync.” position.
Propeller “Phase” is preset at the factory. For further information on Phase control and the Propeller
Synchrophasing System, consult your aircraft service manual.
i
NOTE
Should it be necessary to completely deactivate the Prop Sync.
system the circuit breaker must be pulled.
NOTE
Each time a propeller RPM differential greater than 50 RPM
occurs, it will be necessary to recycle the system to “MAN.” for
30 to 40 seconds then to “Prop Sync.”
NOTE
Should there be an electrical system failure the slave engine will
return to the control selected RPM + approximately 25 RPM.
OPERATING INSTRUCTIONS
REVISED: August 27.1971
PAGE 15
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