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* Slide valve
* Solenoid valve
* Position switch.
Functional Description
The landing gear transfer valve gets signals from the PSEU for
automatic and manual operation.
The landing gear transfer valve moves automatically 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 supplied to valve.
The landing gear transfer valve operates manually when all of
these conditions occur:
* Alternate nose wheel steering switch is moved to the
alternate position
* Normal quantity in system B reservoir
* Nose air/ground system in ground mode.
You can also manually operate the landing gear transfer valve
with the BITE of the proximity switch electronics unit (PSEU).
The position switch on the landing gear transfer valve sends a
signal to the PSEU when the valve moves to the alternate
position.
See the Air/Ground System for more information about the
PSEU. (SECTION 32-09)
LANDING GEAR CONTROL SYSTEM - TRANSFER VALVE
EFFECTIVITY
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LANDING GEAR CONTROL SYSTEM - TRANSFER VALVE
LANDING GEAR CONTROL SYSTEM - TRANSFER VALVE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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LANDING GEAR CONTROL SYSTEM - TRANSFER VALVE
32-31-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The lever lock solenoid prevents accidental movement of the
landing gear control lever to the UP position when the airplane
is on the ground. It also shows that the ground spoiler interlock
valve is open when the airplane is in the air.
Functional Description
The landing gear control lever is locked out of the UP position
by a mechanical lever lock. 28v dc power from the battery bus
goes through the lever lock solenoid and completes a ground at
the proximity switch electronics unit when these conditions are
true:
* Ground spoiler interlock valve closed
* Air/ground system 1 in air mode
* Air/ground system 1 not override to air (from PSEU BITE).
When the lever lock solenoid energizes, it retracts. This moves
the lever lock to the not locked position. This lets the pilot move
the landing gear control lever to the UP position.
If the solenoid fails to unlock the lever after takeoff, the pilot
pulls the lever lock override trigger on the control lever and
moves the control lever to the UP position.
Training Information Point
During the landing gear control system test, you operate the
lever lock override trigger and move the control lever to the UP
position. You also try to move the control lever to the UP
position without the override trigger to make sure that the lever
lock solenoid operates correctly.
Obey these warnings when you put the airplane in the air mode:
WARNING: MAKE SURE THE DOWNLOCK PINS ARE
INSTALLED ON ALL THE LANDING GEAR.
WITHOUT THE DOWNLOCK PINS, THE LANDING
GEAR COULD RETRACT AND CAUSE INJURY TO
PERSONS AND DAMAGE TO EQUIPMENT.
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT
ARE CLEAR OF RUDDER, THRUST REVERSERS,
AND LEADING EDGE SLATS BEFORE YOU
SUPPLY HYDRAULIC POWER. RUDDER, THRUST
REVERSERS, AND LEADING EDGE SLATS CAN
MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC
POWER. THIS CAN CAUSE INJURY TO PERSONS
AND DAMAGE TO EQUIPMENT.
WARNING: KEEP PERSONS AND EQUIPMENT CLEAR OF THE
FLIGHT CONTROL SURFACES. THESE
COMPONENTS CAN MOVE SUDDENLY WHEN
YOU PUT THE AIRPLANE IN AIR MODE. THIS
CAN CAUSE INJURY TO PERSONS AND DAMAGE
TO EQUIPMENT.
LANDING GEAR CONTROL SYSTEM - LEVER LOCK - FUNCTIONAL DESCRIPTION - ELECTRICAL
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-31-00-008
WARNING: OBEY THE PROCEDURE THAT PREPARES TO PUT
THE AIRPLANE IN THE AIR MODE. IN THE AIR
MODE, MANY OF THE AIRPLANE SYSTEMS CAN
OPERATE. THIS CAN CAUSE INJURIES TO
PERSONS AND DAMAGE TO EQUIPMENT CAN
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