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Both valves close if either engine thrust is above the takeoff warning setting or either temperature sensor senses a duct overtemperature. The valves automatically reopen if thrust on both engines is reduced and both temperature sensors are cool.
With the air/ground sensor in the ground mode and the WING ANTI–ICE switch ON, the switch remains in the ON position regardless of control valve position. The WING ANTI–ICE switch automatically trips OFF at lift–off when the air/ground sensor goes to the air mode.
In flight, both control valves open when the WING ANTI–ICE switch is positioned ON. Duct temperature and thrust setting logic are disabled and have no affect on control valve operation in flight.
Valve position is monitored by the blue VALVE OPEN lights.
Airplanes with Ground–Inhibited Wing Anti-Ice
The air/ground sensor prevents the wing anti–ice control valves from opening on the ground except during ground test.
A ground overheat thermal switch in each wing closes the wing anti–ice control valves if bleed air temperature is excessive during ground test. Activation if either thermal switch closes both valves. The thermal switches are deactivated in flight.
In flight, both control valves open when the WING ANTI–ICE switch is positioned ON. Duct temperature and thrust setting logic are disabled and have no affect on control valve operation in flight.
Valve position is monitored by the blue VALVE OPEN lights.
If low-altitude icing conditions exist or are anticipated, the non-ground operable system’s ON-OFF-GRD TEST switch is placed in the ON position on the ground. The WTAI valves are closed, but the system is armed for flight. During liftoff, the air/ground relay enables the WTAI system and both valves open, providing ice protection to the wing’s leading edge. A thrust penalty is taken due to WTAI bleed air extraction.
Copyright . The Boeing Company. See title page for details.
3.20.6  December 7, 2001

Anti-Ice, Rain -System Description 737 Operations Manual
Wing Anti–Ice System Schematic

CONDITIONS:
ON THE GROUND
WING ANTI-ICE ON
ENGINES AT IDLE THRUST

BLEED AIR DUCT TEMPS LOW
Airplanes with Ground-Operational Wing Anti-Ice
Copyright . The Boeing Company. See title page for details.
December 7, 2001  3.20.7
Anti-Ice, Rain -System Description 737 Operations Manual

TELESCOPING DUCT
CONDITIONS:
IN FLIGHT
WING ANTI-ICE ON
BLEED AIR
Airplanes with Ground-Inhibited Wing Anti-Ice
Copyright . The Boeing Company. See title page for details.
3.20.8  December 7, 2001

Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4.10.1
Mode Control Panel (MCP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4.10.1 Speed Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4.10.1 Vertical Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4.10.4 Lateral Navigation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4.10.9 Autopilot / Flight Director . . . . . . . . . . . . . . . . . . . . . . . . . . 4.10.13
Autopilot / Autothrottle Controls . . . . . . . . . . . . . . . . . . . . . . . . 4.10.16 Autopilot / Autothrottle Indicators . . . . . . . . . . . . . . . . . . . . . . . 4.10.17 Altitude Alert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.10.19 Thrust Mode Display / Thrust Mode Annunciator Panel . . . . . . 4.10.20 Flight Mode Annunciations (FMAs)  . . . . . . . . . . . . . . . . . . . . . 4.10.21
System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4.20.1
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4.20.1 Autopilot Flight Director System . . . . . . . . . . . . . . . . . . . . . . . . .  4.20.1 MCP Mode Selector Switches  . . . . . . . . . . . . . . . . . . . . . . . .  4.20.1 Autopilot Engagement Criteria . . . . . . . . . . . . . . . . . . . . . . . .  4.20.2 Autopilot Disengagement . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4.20.2 AFS Failures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4.20.2 Flight Director Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4.20.3 AFDS Status Annunciation . . . . . . . . . . . . . . . . . . . . . . . . . . .  4.20.4 AFDS Flight Mode Annunciations . . . . . . . . . . . . . . . . . . . . .  4.20.4 Autopilot Control Wheel Steering  . . . . . . . . . . . . . . . . . . . . .  4.20.6 Autothrottle System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.20.7 Autothrottle Engagement  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.20.8 Autothrottle Disengagement . . . . . . . . . . . . . . . . . . . . . . . . . . 4.20.8 Altitude Alerting System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.20.8 Acquisition Alerting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4.20.9 Deviation Alerting  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4.20.9 Altitude Alert  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.20.10
　
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