Piper Malibu PA-46-310P Pilot Operating Handbook page 452

PIPER AIRCRAFT CORPORATION
PA-46-310P, MALIBU
SECTION 9
SUPPLEMENT 10
Circuit protection for the surface deice system is provided by a SURF
DEICE circuit breaker located on the circuit breaker panel.
"'-1f WING ICE DETECTION LIGHT
Wing icing conditions may be detected during night flight by use of an
ice detection light installed on the left side of the forward fuselage. The light
is controlled by an ICE LIGHT switch ( Figure 7-1) located on the deice
switch panel. Circuit protection is provided by an ICE circuit breaker located
in the LIGHT section of the circuit breaker panel.
ELECTRIC PROPELLER DEICE
Electrothermal propeller deice pads are bonded to a portion of the
leading edges of the propeller blades. The system is controlled by an ON-
OFF type PROP HEAT switch (Figure 7-1) located on the deice switch
panel. Power for the propeller deicers is supplied by the aircraft electrical
system through a PROP HEAT circuit breaker on the circuit breaker panel.
When the PROP HEAT switch is actuated, power is applied to a timer
through the PROP HEAT ammeter which monitors the current through
the propeller deice system.
Power from the timer is cycled to brush assemblies which distribute
power to slip rings. The current is then supplied from the slip rings directly to
the electrothermal propeller deice pads.
The Hartzell propeller is deiced in a cycle which applies power to the
deice pads for approximately 90 seconds and then shuts off for approxi-
mately 90 seconds. Once begun, cycling will proceed in the above sequence
and will continue until the system is turned off. The PROP HEAT
ammeter should indicate within the green shaded area during the portion of
the cycle when power is being applied. This indicates proper operation of the
system.
The propeller designation is: BHC-C2YF-I BF/ F8052-0.
The heat provided by the deice pads reduces the adhesion between the
ice and the propeller so that centrifugal force and the blast of the airstream
cause the ice to be thrown off the propeller blades in small pieces.
ISSUED: JULY 30, 1984 REPORT: VB-1200
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