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OCCUR.
WARNING: DO THE DEACTIVATION PROCEDURE TO
PREVENT THE OPERATION OF THE THRUST
REVERSER. THE ACCIDENTAL OPERATION OF
THE THRUST REVERSER CAN CAUSE INJURIES
TO PERSONS AND DAMAGE TO EQUIPMENT.
NOTE: If you put the airplane in the air mode, you need to
make sure that the takeoff warning horn will not
operate.
NOTE: If you put the airplane in the air mode, you need to
make sure that the weather radar will not operate.
NOTE: If you put the airplane in the air mode for more than
one minute, you need to deactivate the drain mast heat.
During the landing gear control system test, you put the
airplane in the air mode by one of these three ways:
* Put deactuators on the nose and main landing gear to put the
airplane in the air mode
* Lift the airplane on jacks.
* With the BITE in the Proximity Switch Electronics Unit
(PSEU).
See the Air/Ground section for more information about the
PSEU. (SECTION 32-09)
See the Takeoff/Landing Warning section for more information
about the takeoff warning horn. (SECTION 31-51)
See the Weather Radar section for more information about the
weather radar. (SECTION 34-43)
See the Pitot And Static section for more information about the
drain mast heat. (SECTION 30-30)
LANDING GEAR CONTROL SYSTEM - LEVER LOCK - FUNCTIONAL DESCRIPTION - ELECTRICAL
EFFECTIVITY
GUN ALL 32-31-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-31-00-008
LANDING GEAR CONTROL SYSTEM - LEVER LOCK - FUNCTIONAL DESCRIPTION - ELECTRICAL
LANDING GEAR CONTROL SYSTEM - LEVER LOCK - FUNCTIONAL DESCRIPTION - ELECTRICAL
EFFECTIVITY
GUN ALL 32-31-00
Page 17
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-31-00-008
General
The landing gear transfer valve changes the landing gear
pressure supply from system A to system B automatically or
manually.
Automatic Operation
The landing gear transfer valve automatically moves to the
alternate position when all of these conditions occur:
* Airplane in the air
* Landing gear lever not down
* One main landing gear not up
* Left engine N2 speed less than 50%
* Hydraulic system B pressure to valve.
The air/ground systems in the proximity switch electronics unit
(PSEU) supply air/ground information. The landing gear
indication function of the PSEU supplies main landing gear
position and landing gear control lever position. The left engine
running relay supplies a signal when the engine speed
decreases to less than 50%. Two circuit breakers supply 28v
dc power.
The PSEU processes the inputs and supplies two signals to the
coils on the solenoid valve on the landing gear transfer valve.
The position switch on the transfer valve sends a ground to the
PSEU.
Manual Operation
When the airplane is on the ground and with normal quantity in
the hydraulic system B reservoir, the landing gear transfer
valve moves to the alternate position when you move the
alternate nose wheel steering switch on the P1 panel to the ALT
position.
The system B low quantity latch prevents operation of the
landing gear transfer valve when the alternate nose wheel
steering switch is in the alternate position, and the system B
hydraulic quantity momentarily decreases to less than 21
percent. The transfer valve moves to the normal position if the
latch sets during alternate operation.
The low quantity latch stops intermittent operation of the
transfer valve if the system B quantity increases more than and
decreases less than 21 percent again and again. The latch sets
when the nose air/ground system is in the ground mode and the
system B quantity is low. The latch resets when the alternate
nose wheel steering switch is in the normal position.
Training Information Point
You can use the BITE on the PSEU to do an operation test of the
landing gear transfer valve.
See the Air/ground System section for more information about
the PSEU. (SECTION 32-09)
LANDING GEAR CONTROL SYSTEM - LANDING GEAR TRANSFER VALVE - FUNCTIONAL DESCRIPTION - ELECTRICAL
EFFECTIVITY
GUN ALL 32-31-00
Page 18
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-31-00-009
LANDING GEAR CONTROL SYSTEM - LANDING GEAR TRANSFER VALVE - FUNCTIONAL DESCRIPTION - ELECTRICAL
　
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