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COMPONENTS CAN MOVE SUDDENLY WHEN
YOU PUT THE AIRPLANE IN AIR MODE. THIS
CAN CAUSE INJURIES TO PERSONS AND
DAMAGE TO EQUIPMENT.
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
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.
STANDBY HYDRAULIC SYSTEM - FUNCTIONAL DESCRIPTION - ELECTRICAL - VALVES
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-22-00-010
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 standby hydraulic system test, you put the airplane
in the air mode by one of these three ways:
* Use the AIR/GROUND OVERRIDE in the proximity switch
electronics unit (PSEU) BITE.
* Put deactuators on the nose and main landing gear to put the
airplane in the air mode
* Lift the airplane on jacks.
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 31-53)
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)
STANDBY HYDRAULIC SYSTEM - FUNCTIONAL DESCRIPTION - ELECTRICAL - VALVES
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-22-00-010
STANDBY HYDRAULIC SYSTEM - FUNCTIONAL DESCRIPTION - ELECTRICAL - VALVES
STANDBY HYDRAULIC SYSTEM - FUNCTIONAL DESCRIPTION - ELECTRICAL - VALVES
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-22-00-010
THIS PAGE IS INTENTIONALLY LEFT BLANK
29-25-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The hydraulic power transfer unit (PTU) system supplies
alternate hydraulic pressure to the leading edge flaps and
slats when hydraulic system B engine-driven pump (EDP)
pressure is below normal.
HYD POWER TRANSFER UNIT SYSTEM - INTRODUCTION
EFFECTIVITY
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HYD POWER TRANSFER UNIT SYSTEM - INTRODUCTION
HYD POWER TRANSFER UNIT SYSTEM - INTRODUCTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-25-00-006
Purpose
The hydraulic power transfer unit (PTU) system supplies
alternative hydraulic pressure to the leading edge flaps and
slats only. PTU pressure can be used for normal operation or
for autoslat operation when system B engine-drive pump (EDP)
pressure is below normal.
Components
The hydraulic PTU system has these components:
* Power transfer unit
* Check valve (2)
* PTU pressure filter module
* Flow limiter
* PTU control valve
* EDP pressure switch auto slat system.
Power Transfer Unit
The PTU assembly has a hydraulic motor and a hydraulic pump
connected by a common shaft. The motor receives pressure
from hydraulic system A through the PTU control valve to turn
the motor. The pump receives fluid supply from the hydraulic
system B reservoir and supplies alternative pressure to the
leading edge flaps and slats.
PTU Pressure Filter Module
The PTU pressure filter module cleans the pressurized fluid
from the pump of the power transfer unit.
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