737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-009
TE FLAP SYSTEM - FLAP POWER DRIVE UNIT
TE FLAP SYSTEM - FLAP POWER DRIVE UNIT
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-009
Purpose
The TE flap priority valve and the flow limiter control the flow of
hydraulic fluid to the TE flap hydraulic components. The priority
valve gives priority of system B hydraulic power to the LE
devices over the TE flaps. The flow limiter limits the speed of
movement of the TE flaps.
Location
The TE flap priority valve and the flow limiter are on the ceiling
of the MLG wheel well.
Physical Description
The priority valve is a pressure-operated valve with two
positions. If the system B hydraulic pressure is less than 2400
psi, the priority valve moves to the reduced flow position. This
reduces the hydraulic flow to the TE flap components.
The flow limiter limits the hydraulic fluid flow to 14 gpm.
Training Information Point
After installation of the priority valve, you must do a functional
test of the priority valve. In this test, you operate the TE flaps
then monitor the system B hydraulic pressure and the speed of
movement of the TE flaps.
TE FLAP SYSTEM - FLAP PRIORITY VALVE AND FLOW LIMITER
EFFECTIVITY
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-010
TE FLAP SYSTEM - FLAP PRIORITY VALVE AND FLOW LIMITER
TE FLAP SYSTEM - FLAP PRIORITY VALVE AND FLOW LIMITER
EFFECTIVITY
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-010
Purpose
The TE flap bypass valve prevents the hydraulic operation of the
TE flaps during these conditions:
* Alternate flap operation (arm switch in arm position)
* TE flap skew
* TE flaps asymmetry
* TE flaps uncommanded motion (UCM).
There is more information on these conditions later in this
section.
Location
The bypass valve is on the aft bulkhead of the MLG wheel well.
Physical Description
The bypass valve is a two position valve that uses 28v dc power
from bus 1. The valve has a manual override lever that shows
the position of the valve.
Functional Description
When the bypass valve is in the normal position, it lets hydraulic
power from the flap control valve go to the TE flap hydraulic
motor. When the bypass valve is in the bypass position, it
connects the hydraulic lines on both sides of the hydraulic
motor to each other. This stops operation of the hydraulic
motor, prevents a hydraulic lock, and lets alternate flaps
operation backdrive the hydraulic motor.
Training Information Point
When you deactivate the TE flap system, you must disconnect
the electrical connector and install a lock on the flap bypass
valve. This lock holds the manual override lever in the bypass
position.
TE FLAP SYSTEM - TE FLAP BYPASS VALVE
EFFECTIVITY
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-011
TE FLAP SYSTEM - TE FLAP BYPASS VALVE
TE FLAP SYSTEM - TE FLAP BYPASS VALVE
EFFECTIVITY
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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TE FLAP SYSTEM - TE FLAP BYPASS VALVE
27-51-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The flap torque tubes transmit power from the TE flap PDU,
through the angle gearboxes, to the flap transmissions. The
torque tube supports transmit power between two torque tubes
in areas where stronger torque tubes are necessary.
Location
There are 16 torque tubes of different lengths for the flap drive
system. These torque tubes are in the MLG wheel well, along
the MLG beams, and along the rear spar of both wings. To get
access, go through the MLG wheel well, go through removable
access panels under the wings, or extend the TE flaps.
　
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