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CHAPTER EIGHT
STUDENT GUIDE FOR T-1A AIRCRAFT SYSTEMS
AOA Transmitter Anti-Ice System
The AOA transmitters (one located on each side of the fuselage just below the flight deck side
windows) are protected from icing by electric heat. The vane heater maintains the vane surface
temperature at approximately 260 F. A white operation light above the switch indicates current
flow.
808. FLIGHT DECK WINDOWS ANTI-ICE AND DEFOG
The flight deck windows icing and condensation protection subsystem utilizes multiple
subsystems. Electrical heating elements imbedded within layers of the windshield provide icing
prevention. The ACU subsystem supplies bleed air through the cabin air distribution ducts for
windshield condensation removal and prevention. The EHS provides supplemental window
defogging.
Windshield Heating Subsystem
The windshield construction includes a number of resistance wires placed in parallel that act as
heating elements. Each side of the divided windshield has two temperature sensors laminated
into the windshield lower forward edge. These sensors monitor heating element temperature and
provide the controller signals to open or close the heater circuit. The control unit incorporates a
warning circuit which illuminates the red windshield overheat annunciator, placarded L WSHLD
OV HT or R WSHLD OV HT on the main annunciator panel. These annunciators will also
illuminate should a malfunction occur in the system. An illuminated white operation light,
located directly above each anti-ice control switch, indicates when power is on the respective
heater elements. The operation light extinguishes when the windshield reaches the minimum
temperature and the controller cycles off, or when the switch is turned off.
809. ANTI-ICING AND DEFOG SYSTEMS LIMITATIONS
Reference Miscellaneous Limitations - Anti-Icing Limitations, Windshield Heat Limitations, and
Wing Heat Limitations, Section V, T.O. 1T-1A-1, for specific limitations of the anti-icing and
defog systems.
8-4 ANTI-ICE AND DEFOG SYSTEMS


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