CESSNA SECTION 7
MODEL T182T NAV III AIRPLANE AND SYSTEM DESCRIPTION
GFC 700 AFCS
U.S.
PROPELLER (Continued)
PROPELLER HEAT
The propeller heat system provides a measure of protection for the
propeller blade surfaces if unexpected icing conditions are
encountered. The system is operated by a three-position switch labeled
PROP HEAT (TEST-ON-OFF) located on the switch panel. When the
switch is placed to the ON position, electric current flows to the
propeller heat timer, which cycles the current on and off for 90-second
periods to the heated boots located on each of the propeller blades.
The timer monitors the system current draw during the on periods and
checks the system for open and short circuit conditions. When the
system conditions are normal, a green PROP HEAT annunciator is
shown on the PFD. If the timer detects faulty system wiring or a heated
boot failure, it removes the current supply to the boots, and the green
PROP HEAT annunciator goes off and an amber PROP HEAT
annunciator comes on.
The timer will continue to monitor the status of the system during the
fault condition and will return the system to normal operation
automatically if the detected faults are cleared. When the system is on
and operating normally the monitor circuits of the timer can be tested by
placing the PROP HEAT switch in the TEST position. The test
simulates a propeller heat system fault and the timer will extinguish the
green PROP HEAT annunciator and an amber PROP HEAT
annunciator will come on. Upon release of the test switch the system
will return to normal operation.
T182TPHBUS-01
7-47
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