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system B, which is powered by AC Transfer Bus 2:
* UPPER RIGHT (F/O) PITOT
* LOWER RIGHT (AUX) PITOT
* RIGHT ALPHA VANE
* RIGHT ELEVATOR PITOT
If system A or system B does not operate correctly, this
configuration makes it possible to continue safe flight with the
essential air data from the system that still operates.
ICE AND RAIN PROTECTION - PITOT AND STATIC - WINDOW/PITOT HEAT MODULE
EFFECTIVITY
GUN ALL 30-30-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-30-00-040
ICE AND RAIN PROTECTION - PITOT AND STATIC - WINDOW/PITOT HEAT MODULE
ICE AND RAIN PROTECTION - PITOT AND STATIC - WINDOW/PITOT HEAT MODULE
EFFECTIVITY
GUN ALL 30-30-00
Page 7
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-30-00-040
Purpose
The pitot probe anti-icing system prevents ice on the pitot tubes.
This prevents false air data signals that ice can cause.
Physical Description
The pitot probes have these parts:
* Pitot tube with integral heat element
* Pressure sense connector
* Electrical connector
* Baseplate.
Location
There is one pitot probe (captain) on the left forward fuselage.
There are two pitot probes (first officer and auxiliary) on the
right forward fuselage.
There are two elevator pitot probes on the vertical stabilizer.
General
The pitot probes have electric heaters. If a probe heater fails,
you must replace the probe.
See the navigation chapter for more information on the captain,
first officer, and auxiliary pitot probes. (SECTION 34-11)
See the elevator and tab control system for more information on
the elevator pitot probes. (SECTION 27-31)
Training Information Point
NOTE: Use hardwood or plastic tools when you remove or
apply the sealant around the probe baseplate. Do not
damage the fuselage aluminum cladding when you
remove sealant.
WARNING: DO NOT TOUCH THE PROBES WHILE THE
HEATERS ARE ON. BEFORE YOU TOUCH IT,
FEEL FOR HEAT RADIATION FROM THE PROBE.
HOT PROBES CAN BURN YOU.
Use a backup wrench when you connect the probe sense line.
This will prevent damage to the probe.
ICE AND RAIN PROTECTION - PITOT AND STATIC - PITOT PROBE
EFFECTIVITY
GUN ALL 30-30-00
Page 8
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-30-00-010
ICE AND RAIN PROTECTION - PITOT AND STATIC - PITOT PROBE
ICE AND RAIN PROTECTION - PITOT AND STATIC - PITOT PROBE
EFFECTIVITY
GUN ALL 30-30-00
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
30-30-00-010
Functional Description
The pitot probe anti-icing system uses electric power and
resistance-type heaters in the probes.
The system uses 115v ac and 28v dc power. Each probe heater
uses 115v ac power. The current detection circuit uses 28v dc
power.
Each pitot probe has a heater. The heater is part of the probe. If
the heater fails, you must replace the probe.
The window/pitot heat module does these things:
* Controls pitot probe heat
* Gives indication of system status.
Put the control switch to the ON position to turn on probe heat.
This lets 115v ac power go through the current detection
circuitry to the probe heater.
When the probe heater uses current, the current detection
circuit causes the amber light to go out. If the probe heater does
not use current, the circuit causes these indications:
* Amber CAPT PITOT light comes on
* Amber L ELEV PITOT light comes on
* MASTER CAUTION and ANTI-ICE annunciator lights come
on.
ICE AND RAIN PROTECTION - PITOT AND STATIC - PITOT PROBE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 30-30-00
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
30-30-00-015
ICE AND RAIN PROTECTION - PITOT AND STATIC - PITOT PROBE - FUNCTIONAL DESCRIPTION
ICE AND RAIN PROTECTION - PITOT AND STATIC - PITOT PROBE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-012, 016-099, 101-118 30-30-00
Page 11
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
　
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