Maintenance Practices
61-00-40
Page 6-20
Rev. 2 Jun/12
Propeller Owner's Manual
140
6. Maximum RPM Check (On Ground)
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
HOLDER'S APPROVED MAINTENANCE DATA.
WARNING 3: SIGNIFICANT ADJUSTMENT OF THE LOW
PITCH STOP TO ACHIEVE THE SPECIFIED
STATIC RPM MAY MASK AN ENGINE POWER
PROBLEM.
A. The propeller low pitch stop is set to the aircraft TC or STC
holder's requirements. 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. An overspeed at the maximum power static condition
indicates that the propeller low-pitch blade angle is set too
low or that the governor is improperly adjusted.
C. An underspeed during the maximum power static condition
may be caused by any one or a combination of the following:
(1) The propeller low pitch blade angle is too high
(2) The governor is improperly adjusted
(3) The engine is not producing rated power
Summary of Contents for HC-D2MV20-3 Series
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