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downstream of the inlet cowl thermal anti-ice valve.
Physical Description
The inlet cowl TAI pressure switch has these parts:
* Sense Line connector
* Electrical connector.
Functional Description
The switch is an aneroid type switch.
When the pressure at the sense port is more than 65 psi, the
switch closes. This enables the indication light on P5 forward
overhead panel.
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - INLET COWL TAI PRESSURE SWITCH
EFFECTIVITY
GUN ALL 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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
30-20-00-010
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - INLET COWL TAI PRESSURE SWITCH
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - INLET COWL TAI PRESSURE SWITCH
EFFECTIVITY
GUN ALL 30-20-00
Page 9
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-20-00-010
General
There are two inlet cowl anti-icing systems (engine 1 and
engine 2). The two systems are the same. The control and
indications circuits for the inlet cowl anti-icing systems use 28v
dc power.
The switches and lights for the control and indication are on the
P5-11 engine and wing anti-ice panel.
Inlet Cowl Anti-Icing
When you put the ENG ANTI-ICE switch in the ON position, the
switch does these things:
* Sends 28v dc to energize the control solenoid on the inlet
cowl TAI valve
* Gives an open loop discrete to the EEC (for engine idle
control)
* Gives an open loop discrete to the FMC (to bias fuel
schedules for bleed loads).
The control panel logic and a dimming diode control the blue
COWL VALVE OPEN lights:
* Light is off - the switch is in the OFF position and the valve is
closed
* Light is dim - the switch is in the ON position and the valve is
open
* Light is bright - the switch position and valve position
disagree or the valve is in transit.
These things control the bright and dim functions of the COWL
VALVE OPEN lights on the anti-ice panel:
* System switch and valve position feedback
* Control panel solid state switch circuits
* Voltage reduction zener diodes (dim mode).
The closed position switch and the open position switch give
valve position data.
The closed position switch is in the closed position when the
valve is almost closed.
The open position switch is in the open position when the valve
is more than 15 degrees open.
Overpressure Indication
When the inlet cowl TAI pressure switch operates, it causes
these lights to come on:
* The amber COWL ANTI-ICE light
* The MASTER CAUTION and ANTI-ICE annunciator lights.
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 30-20-00
Page 10
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-20-00-015
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - FUNCTIONAL DESCRIPTION
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 30-20-00
Page 11
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-20-00-015
CDS Displays
The common display system (CDS) shows engine inlet cowl TAI
status. The display message is TAI. It shows left of each digital
N1 speed indication field.
The TAI message is green when the switch is in the ON position
and the CTAI valve is open.
The TAI message is amber when the switch and the valve
position do not agree for more than 8 seconds.
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - OPERATION
EFFECTIVITY
GUN ALL 30-20-00
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
30-20-00-020
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - OPERATION
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - OPERATION
EFFECTIVITY
GUN ALL 30-20-00
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
30-20-00-020
Purpose
The anti-ice panel does these things:
　
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