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Functional Description
The switches are bimetallic. Thermal expansion closes the
switch when the temperature is 257F (125C).
When the switch closes, a ground discrete signal is sent to the
engine and wing anti-ice control panel (P5-11).
Both WTAI shutoff valves close in response to either thermal
switch.
ICE AND RAIN PROTECTION - WTAI - WING ANTI-ICING GROUND OVERHEAT THERMAL SWITCH
EFFECTIVITY
GUN ALL 30-11-00
Page 12
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-11-00-007
ICE AND RAIN PROTECTION - WTAI - WING ANTI-ICING GROUND OVERHEAT THERMAL SWITCH
ICE AND RAIN PROTECTION - WTAI - WING ANTI-ICING GROUND OVERHEAT THERMAL SWITCH
EFFECTIVITY
GUN ALL 30-11-00
Page 13
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-11-00-007
Purpose
The wing anti-icing telescoping ducts supply hot air to the spray
tubes in the wing leading edge.
Location
There are six wing anti-icing telescoping ducts. They are in the
wing leading edges between the wing thermal anti-ice (WTAI)
supply duct and the three inboard slats of each wing.
Physical Description
Each wing has three wing anti-icing telescoping ducts.
The telescoping ducts have an inner and outer section. The
inner and outer sections slide over each other during slat
extension and retraction.
The inner tube is teflon coated to prevent binding when the two
sections slide over each other.
Functional Description
The anti-icing telescoping ducts let hot air from the WTAI duct
flow to the slat spray tubes.
The spray tubes have holes to let the bleed air into the slat
cavity. The air circulates in the cavity and warms the slat. This
prevents ice formation on the slat. The air then bleeds
overboard through holes in the bottom of the slat.
ICE AND RAIN PROTECTION - WTAI - WING ANTI-ICING TELESCOPING DUCT
EFFECTIVITY
GUN ALL 30-11-00
Page 14
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-11-00-006
ICE AND RAIN PROTECTION - WTAI - WING ANTI-ICING TELESCOPING DUCT
ICE AND RAIN PROTECTION - WTAI - WING ANTI-ICING TELESCOPING DUCT
EFFECTIVITY
GUN ALL 30-11-00
Page 15
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-11-00-006
Purpose
The two control stand WTAI switches give thrust lever position
feedback to the engine and wing anti-ice control panel (P5-11).
Location
There are two control stand wing anti-ice switches.
One switch is on each of the two autothrottle switchpacks.
Access is through the forward equipment compartment.
Functional Description
When you advance the throttles (approximately 60 degrees
thrust resolver angle), the switches close and give ground
inputs to the control panel.
The wing anti-ice control panel closes both WTAI shutoff valves
in response to either control stand wing anti-ice switch. The
control stand enables this protection only when the airplane is
on the ground. This conserves engine power for takeoff.
ICE AND RAIN PROTECTION - WTAI - CONTROL STAND WING ANTI-ICE SWITCHES
EFFECTIVITY
GUN ALL 30-11-00
Page 16
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-11-00-004
ICE AND RAIN PROTECTION - WTAI - CONTROL STAND WING ANTI-ICE SWITCHES
ICE AND RAIN PROTECTION - WTAI - CONTROL STAND WING ANTI-ICE SWITCHES
EFFECTIVITY
GUN ALL 30-11-00
Page 17
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-11-00-004
Purpose
The wing thermal anti-ice (WTAI) solenoid valve bleeds actuator
pressure from the precooler control valve. The WTAI solenoid
valve operates when the wing thermal anti-icing system is used
on the ground.
Location
There are two WTAI solenoid valves. There is one valve on the
top of each engine. Access is by opening the thrust reverser
cowl.
Physical Description
The WTAI solenoid valve is a normally closed ball-type poppet
valve. It is energized to the open position with 28v dc electric
power.
Functional Description
　
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