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* PRSOV - pressure regulating shutoff valve
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Wing and Inlet Cowl Thermal Anti-ice Systems
The wing thermal anti-ice and the engine inlet cowl thermal
anti-ice systems use hot bleed air to prevent ice.
Air Data Probe Heat
The air data probes use electric heat to prevent ice.
Flight Compartment Windows
Flight deck windows use electric heat to do these functions:
* Prevent ice formation on the windows
* Prevent fog on the windows
* Improve window impact strength.
The windows use these features to improve forward vision in
rain:
* Wipers
* Hydrophobic (rain repellent) coatings.
Water and Waste System lines and Drains
The water and waste lines and drains use electric heat to
prevent ice.
Ice and Rain Controls
The controls and indications for the ice and rain protection
systems are in the flight compartment on the P5 forward
overhead panel.
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Purpose
The wing thermal anti-ice system (WTAI) keeps ice from the
leading edge of the wing.
General Description
The WTAI system uses hot air from the pneumatic system to
heat the three inboard leading edge slats of the wing.
A switch on the P5 forward overhead panel controls the
operation of the WTAI system.
The WTAI system may operate in flight or on the ground.
When the system is on, the valves open and hot air from the
pneumatic ducts goes to the leading edge of the wings. The
heated air flows to the three inboard leading edge slat spray
tubes. The air sprays into the slat cavities and exhausts
overboard through holes in the bottom of the slats.
Overheat switches in each wing leading edge, protect the slats
from overheat. This overheat protection operates only when the
airplane is on the ground.
Switches on the control stand close the WTAI valves when you
advance the engine thrust levers. This conserves engine thrust
for takeoff. This thrust conservation protection only operates
when the airplane is on the ground.
The air/ground logic gives the wing anti-ice system air ground
sense feedback. The engine and wing anti-ice module uses this
feedback to enable overheat and thrust conservation protection
for the wing anti-ice system. It also turns off the WTAI system
during takeoff.
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ICE AND RAIN PROTECTION - WTAI - INTRODUCTION
　
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