Textron Cessna Grand Caravan Ex 208B Pilot's Operating Handbook And Faa Approved Airplane Flight Manual page 724

SECTION 9 - SUPPLEMENTS CESSNA
SUPPLEMENT 1 MODEL 208B 867 SHP
GARMIN G1000
AIRPLANE SYSTEMS AND DESCRIPTIONS
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TKS ICE PROTECTION SYSTEM OPERATION,
INDICATION AND MESSAGING
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Likewise, selecting NORM will also inhibit the red A-ICE PRESS LOW
annunciator for a 15 second period, but the signal inhibiting will
continue with the on-off cycling of the pump. When the pumps are
activated for their 20 second cycle ON, the red A-ICE PRESS LOW
annunciator will be inhibited. After 15 seconds of operation of both
pumps, any low pressure condition will trigger the red A-ICE PRESS
LOW annunciator. When the pumps turn off, the inhibiting circuit is
reset for the next on-off pump cycle of the NORM mode. If a low
pressure condition exists, the operator will see periodic triggering of the
red A-ICE PRESS LOW annunciator for approximately 6 seconds every
2 minutes.
Inhibiting the red A-ICE PRESS LOW annunciator in HIGH and NORM
modes has been implemented to avoid nuisance CAS alerts.
PITOT/STATIC HEAT SYSTEMS
A left and right pitot-static heat system is installed to assure proper
airspeed indications in the event icing conditions are encountered. The
system is designed to prevent ice formation rather than remove it. The
pitot-static heat system consists of a heating element in each pitot-
static tube, a two-position toggle switch, labeled P/S HEAT/LOW A/S
AWARE, on the ANTI-ICE switch panel, and two pull-off type circuit
breakers, labeled LEFT PITOT HEAT and RIGHT PITOT HEAT, on the
left sidewall switch and circuit breaker panel. When the P/S HEAT/LOW
A/S AWARE switch is turned on, elements in both pitot-static tubes are
heated electrically to maintain proper operation in icing conditions.
Both pitot and static systems are monitored by the G1000 system for
insufficient current and alerting is provided to the flight crew by a single
chime and an amber L P/S HEAT, R P/S HEAT, or L-R P/S HEAT
annunciation.
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FAA APPROVED
208BPHCUS-S1-00
S1-72 U.S.