MAINTENANCE PRACTICES
61-00-15
Page 6-44
Rev. 24 Dec/20
Propeller Owner's Manual
115N
A. Low Pitch Stop - All Propeller Models
(1) The propeller low pitch stop is set at Hartzell Propeller Inc.
in accordance with the aircraft TC or STC Holder's
requirements and should not require any additional
adjustment.
(2) 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.
(a) 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.
(3) An overspeed at the maximum power static condition
may indicate that the propeller low-pitch blade angle is
set too low or that the governor is improperly adjusted.
(4) An underspeed during the maximum power static
condition may be caused by any one or a combination of
the following:
(a) The propeller low pitch blade angle is too high
(b) The governor is improperly adjusted
(c) The engine is not producing rated power
B. Maximum RPM (Static) Low Pitch Stop Adjustment
WARNING:
SIGNIFICANT ADJUSTMENT OF THE
LOW PITCH STOP TO ACHIEVE THE
SPECIFIED STATIC RPM MAY MASK AN
ENGINE POWER PROBLEM.
(1) Refer to the following applicable procedure for
accomplishing an adjustment to the low pitch angle:
(a) Non-Feathering (-1, -4) Low Pitch Stop Adjustment
1 Loosen the jam nut while holding the low pitch
stop with an allen wrench to prevent the low
pitch stop from turning. Refer to Figure 6-9.
