Propeller Owner’s Manual
139
DESCRIPTION AND OPERATION
61-00-39
Page 2-26
Rev. 17 Apr/20
In reverse mode of operation, the governor is reset to act as
a source of pressurized oil. Control of the propeller then is
transferred to the beta valve.
The propeller is reversed by manually repositioning the
cockpit-controlled cable to cause the beta valve to port oil
from the governor pump to the propeller.
When the propeller reaches desired reverse position,
movement of the beta feedback system will cause the
beta valve to shut off flow of oil to the propeller. Any further
unwanted movement of the propeller toward reverse or any
movement of the manually positioned cable toward high
pitch position will cause the beta valve to drain oil from the
propeller to increase pitch.
E. Propeller Model Designation
(1) Hartzell Propeller Inc. uses a model number designation
system
to identify specific propeller and blade
assemblies. The propeller model number and blade
model number are separated by a slash ( / ).
(a) Example:
propeller model number / blade model
number
(2) The propeller model number is impression stamped on
the propeller hub.
(3) Refer to Table 2-1 for a description of the characters
used in the propeller model number.
