Page 2-33
Dec/05
DESCRIPTION AND OPERATION
61-00-75
Propeller Owner's Manual
175
4. Propeller Anti-Ice and De-Ice Systems
Some Hartzell propellers may be equipped with an anti-ice or
de-ice system. A short description of each of these systems
follows:
A. Propeller Anti-Ice System
A propeller anti-ice system prevents ice from forming on
propeller surfaces. The system dispenses a liquid (usually
isopropyl alcohol), which mixes with moisture on the
propeller blades, reducing the freezing point of the water.
This water/alcohol mixture flows off the blades before ice
forms.
NOTE:
This system must be in use before ice forms. It
is ineffective in removing ice that has already
formed.
(1) System Overview
A typical anti-ice system consists of a fluid tank, pump,
and distribution tubing. The rate at which the anti-icing
fluid is dispensed is controlled by a pump speed rheostat
in the cockpit. The anti-icing fluid is dispensed through
airframe mounted distribution tubing and into a rotating
slinger ring mounted on the rear of the propeller hub.
The anti-icing fluid is then directed through blade feed
tubes from the slinger ring onto the blades via centrifugal
force. The anti-icing fluid is directed onto feed shoes that
are attached to the leading edge of the blade. These
feed shoes evenly distribute and direct the fluid along
the blade leading edge.
OBSOLETE PROPELLER MODELS. SEE COVER PAGE
WARNINGS AND SERVICE BULLETIN HC-SB-61-331
