Page 4-5
Rev. 1 Jun/11
TESTING AND TROUBLESHOOTING
61-00-75
Propeller Owner's Manual
175
3. Troubleshooting
A. Incorrect Maximum RPM (on ground)
(1) Incorrect maximum RPM on the ground may be caused
by low engine power, and incorrect governor maximum
RPM stop setting, or an incorrect propeller low pitch
stop.
(2) Perform a check as described in the Maximum RPM
Check (On Ground) procedure in the Maintenances
Practices chapter of this manual.
(3) If adjustment of the propeller low pitch blade angle is
required, adjustment must be performed by qualified
personnel at an appropriately licensed propeller
service
facility or by the Hartzell factory.
B. Maximum RPM is Low
(1) Engine power is low
(a) Follow aircraft POH and/or AMM recommended
checks to determine if the engine power is low.
(b) If the engine power is low, refer to an appropriately
licensed engine service facility or the engine
manufacturer.
(c) If the engine power is within acceptable limits,
examine the maximum RPM stop setting of the
governor.
(2) Governor Maximum RPM Stop Setting
(a) Set the brakes and chock the wheels of the aircraft,
or tie the aircraft down.
(b) Increase the maximum RPM stop screw of the
governor by one turn.
(c) Advance the propeller RPM control to maximum
RPM and reduce the control by 1 inch (25.4 mm).
(d) Start the engine.
(e) Slowly advance the throttle to maximum manifold
pressure.
(f) Slowly advance the propeller control lever until the
engine speed stabilizes.
OBSOLETE PROPELLER MODELS. SEE COVER PAGE
WARNINGS AND SERVICE BULLETIN HC-SB-61-331