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* Gives the flight crew interface with the wing and engine inlet
cowl anti-icing systems
* Has the circuitry for control and indication of the cowl antiicing
system.
Location
The panel is on the P5 forward overhead panel.
General Description
The cowl anti-ice valve opens when the switch is in the ON
position on the ground or in flight. The blue COWL VALVE OPEN
light shows the valve and switch positions. These are the light
indications:
* 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 are not
the same or the valve is in transit.
When the duct pressure downstream of the valve is too high,
this is the indication:
* Amber COWL ANTI-ICE light
* MASTER CAUTION and ANTI-ICE annunciator lights.
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - CONTROLS
EFFECTIVITY
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ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - CONTROLS
ICE AND RAIN PROTECTION - INLET COWL ANTI-ICING SYSTEM - CONTROLS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The probe anti-icing system prevents ice on the air data probes.
General
You control the probe heat from the window/pitot heat module
on the P5 forward overhead panel.
The probes have integral heaters that use electrical power for
heat.
The probe anti-icing system supplies heat to these probes:
* Angle of attack sensor (2)
* Total air temperature probe
* Pitot probes (5).
The static system sense ports are not part of the probe heat
system. These ports are flush with the fuselage and heat is not
necessary.
ICE AND RAIN PROTECTION - PITOT AND STATIC - INTRODUCTION
EFFECTIVITY
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EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The window/pitot heat module does these things:
* Controls the electric power to the probe anti-icing systems
* Gives the flight crew indication of the probe anti-icing system
status.
Location
The window/pitot heat module is on the P5 forward overhead
panel.
General Description
There are two air data probe heater systems, A and B. These
toggle switches let the crew turn on the probe heat systems:
* PROBE HEAT A
* PROBE HEAT B.
There are two system indication light banks, one for the A
system and one for the B system. The lights come on when the
probe heaters do not draw electrical current.
Use the total air temperature test (TAT TEST) switch to do a test
of the electric heater on the ground.
The heat for these probes is controlled through probe system A,
which is powered by AC Transfer Bus 1:
* LEFT (CAPT) PITOT
* LEFT ELEVATOR PITOT
* LEFT ALPHA VANE
* TEMPERATURE PROBE
The heat for these probes is controlled through probe heater
　
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