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Propeller Owner's Manual
175
MAINTENANCE PRACTICES
61-00-75
Page 6-21
Rev. 1
Jun/11
6. Propeller Low Pitch Setting
WARNING 1:
RPM ADJUSTMENTS MUST BE MADE
WITH REFERENCE TO A CALIBRATED
TACHOMETER. AIRCRAFT MECHANICAL
TACHOMETERS DEVELOP ERRORS OVER
TIME, AND SHOULD BE PERIODICALLY
RECALIBRATED TO MAKE SURE THE
PROPER RPM IS DISPLAYED.
WARNING 2:
LOW PITCH BLADE ANGLE ADJUSTMENTS
MUST BE MADE IN CONSULTATION WITH
THE APPLICABLE TYPE CERTIFICATE
OR SUPPLEMENTAL TYPE CERTIFICATE
HOLDERS APPROVED MAINTENANCE DATA.
A. Low Pitch Stop - All Propeller Models
(1) The propeller low pitch stop is set at the factory to the
aircraft TC or STC Holder's requirements and should
not require any additional adjustment. The TC or STC
Holder provides the required low pitch stop blade angle
and may also provide the acceptable RPM range for
a maximum power static condition. Be aware that the
aircraft TC or STC holder may specify the static RPM to
be less than the RPM to which the engine is rated.
B.
L
ow pitch
measurement on
propeller models
( )HC-83( )( )-2( )( )
WARNING:
PLACE THE PROPELLER IN FEATHER
POSITION BEFORE REMOVING THE
PISTON NUT FROM THE PITCH CHANGE
ROD.
CAUTION:
PLACE A PAN UNDER THE PROPELLER
PISTON BEFORE REMOVING THE NUT
AND MOVING THE PISTON, AS ENGINE
OIL MAY COME OUT OF THE OPENING
IN THE PISTON.
(
1
) Remove the piston nut from the pitch change rod.
OBSOLETE PROPELLER MODELS. SEE COVER PAGE
WARNINGS AND SERVICE BULLETIN HC-SB-61-331