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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The inlet cowl anti-icing system keeps ice from forming on the
engine inlet cowl.
General Description
Each engine has an inlet cowl anti-icing system.
The systems operate in flight and on the ground.
A switch on the P5 forward overhead panel controls the
operation of each inlet cowl anti-icing system.
When the system is on, the inlet cowl thermal anti-ice (TAI)
valve opens. Hot air from the engine bleed air interstage duct
goes through the valve into the hollow inlet cowl. The warm air
increases the temperature in the inlet cowl. The warm air then
goes overboard through a vent at the bottom of the cowl.
Each engine is the source of its inlet cowl thermal anti-icing air.
Thermal anti-icing air is from the engine bleed air interstage
duct, upstream of the pressure regulator and shutoff valve.
An inlet cowl TAI pressure switch monitors the pressure in the
duct downstream of the inlet cowl anti-icing valve.
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - INTRODUCTION
EFFECTIVITY
GUN ALL 30-20-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-20-00-001
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - INTRODUCTION
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - INTRODUCTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-20-00-001
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - INTRODUCTION
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - INTRODUCTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-20-00-001
THIS PAGE IS INTENTIONALLY LEFT BLANK
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - INTRODUCTION
30-20-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The inlet cowl thermal anti-ice (TAI) valve controls the flow of air
to the engine inlet cowl.
Location
The inlet cowl TAI valve is on the right side of the engine fan
case.
Physical Description
The inlet cowl TAI valve has these parts:
* Actuator
* Electrical connector
* Control solenoid
* Manual override collar/position indicator
* Flow body
* Regulator.
Downstream of the valve is a pressure switch.
Functional Description
The inlet cowl anti-ice valve is an electrically controlled and
pneumatically operated butterfly valve. It is spring loaded to the
closed position.
When the control signal energizes the valve solenoid, the
solenoid lets upstream duct pressure into the valve regulator.
The regulator controls the pressure and sends it to the actuator.
The actuator opens the valve against spring pressure. A
downstream sense line on the valve biases the regulator. The
regulator modulates the valve butterfly plate to limit
downstream pressure to 50 psi maximum.
Valve limit switches give valve position feedback to the P5-11
module for system status indication.
Training Information Point
The inlet cowl TAI valve has a manual override collar. You can
manually lock the valve in the full open or full closed position if
the valve fails.
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - INLET COWL TAI VALVE
EFFECTIVITY
GUN ALL 30-20-00
Page 6
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-20-00-005
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - INLET COWL TAI VALVE
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - INLET COWL TAI VALVE
EFFECTIVITY
GUN ALL 30-20-00
Page 7
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-20-00-005
Purpose
The inlet cowl thermal anti-ice (TAI) pressure switch monitors
pressure in the inlet cowl TAI duct downstream of the inlet cowl
TAI valve.
location
The inlet cowl TAI pressure switch is on the inlet cowl TAI duct,
　
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