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ON. TEST HEATERS FOR OPERATION BY FEELING
FOR HEAT RADIATION IN THE NEAR VICINITY OF
HEATER BEING SUBJECTED TO TEST TO AVOID
POSSIBILITY OF PERSONNEL BEING BURNED.
When you replace the TAT probe, make sure the airplane
electrical lead does not fall down into the fuselage. Wires that
fall into the fuselage can be difficult to get.
NOTE: Use only hardwood or plastic tools when you remove
or apply the sealant around the probe base plate. Do
not damage the fuselage aluminum cladding when you
remove sealant.
ICE AND RAIN PROTECTION - PITOT AND STATIC - TAT PROBE
EFFECTIVITY
GUN ALL 30-30-00
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ICE AND RAIN PROTECTION - PITOT AND STATIC - TAT PROBE
ICE AND RAIN PROTECTION - PITOT AND STATIC - TAT PROBE
EFFECTIVITY
GUN ALL 30-30-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-30-00-030
Functional Description
The total air temperature (TAT) probe anti-icing system uses
electric power and resistance-type heating elements.
The system uses 115v ac and 28v dc power. The probe heating
element uses 115v ac power. The current detection circuit uses
28v dc power.
On the ground, put the control switch to the ON position. This
energizes relay K1 and stops 115v ac power through the current
detection circuit to the probe heater. The amber TEMP PROBE
light does not come on.
Push the TEST switch (with control switch in ON position) to
deenergize relay K1. This lets 115v ac power through the
current detection circuit to the probe heater. If the probe heater
does not use current, the circuit causes the amber TEMP
PROBE light to come on.
In flight, relay K1 remains deenergized.
ICE AND RAIN PROTECTION - PITOT AND STATIC - TAT PROBE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 30-30-00
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ICE AND RAIN PROTECTION - PITOT AND STATIC - TAT PROBE - FUNCTIONAL DESCRIPTION
ICE AND RAIN PROTECTION - PITOT AND STATIC - TAT PROBE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 30-30-00
Page 21
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-30-00-035
Pitot and Static Anti-Icing
The PITOT HEAT switches control air data probe heat. They are
two position toggle switches:
* ON
* OFF.
Put the switches in the ON position to heat the air data probes.
Put the switches in the OFF position to stop air data probe heat.
The PITOT HEAT A switch controls heat to these system A
probes:
* Captain pitot
* Left elevator pitot
* Left alpha vane
* Total air temperature (TAT) probe.
The PITOT HEAT B switch controls heat to these system B
probes:
* First officer pitot
* Auxiliary pitot
* Right elevator pitot
* Right alpha vane.
Indication
There is an indication light for each air data probe. These are
the indications:
* The light goes off when the related air data probe has heat
* The light comes on when the related air data probe does not
have heat.
The system indication lights have the press-to-test function. You
can also use the master dim and test switch to do a test of the
lights.
ICE AND RAIN PROTECTION - PITOT AND STATIC - OPERATION
EFFECTIVITY
GUN ALL 30-30-00
Page 22
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-30-00-045
ICE AND RAIN PROTECTION - PITOT AND STATIC - OPERATION
ICE AND RAIN PROTECTION - PITOT AND STATIC - OPERATION
EFFECTIVITY
GUN ALL 30-30-00
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30-30-00-045
THIS PAGE IS INTENTIONALLY LEFT BLANK
30-41-00
Page 1
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The control cabin window anti-icing system improves window
impact strength and prevents ice formation on the flight
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