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INJURY TO PERSONS AND DAMAGE TO
EQUIPMENT.
Training Information Point
To do a check of the TE flap and LE devices operation times with
a hydraulic ground cart, make sure 20 gpm is available.
If it is necessary, you can extend the TE flaps with the LE
devices retracted and disabled. To do this, manually operate
the LE cruise depressurization valve and extend the TE flaps in
the normal operation.
To retract the TE flaps with the LE devices extended and
disabled, use the alternate operation.
TE FLAP SYSTEM - OPERATION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-021
TE FLAP SYSTEM - OPERATION
TE FLAP SYSTEM - OPERATION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-021
General
These are the TE flap hydraulic components that are LRUs:
* Flap priority valve
* Flap flow limiter
* Flap control valve
* Flap load relief solenoid valve
* Flap bypass valve
* Flap hydraulic motor.
Functional Description
Hydraulic fluid from system B flows through the flap priority
valve. This valve reduces the flow of hydraulic fluid to the TE
hydraulic motor to 0.7 gpm if the system B pressure is less than
2400 psi. This gives priority of system B hydraulic power to the
LE devices over the TE flaps.
The flow limiter then limits the flow of hydraulic fluid to 14 gpm.
This controls the speed of movement of the TE flaps.
The flap control unit has a control valve and a flap load relief
solenoid. The control valve uses mechanical inputs from the
flap lever cables to control the hydraulic flow to the hydraulic
motor.
During flap load relief, the flap load relief solenoid energizes
and moves the sleeve in the control valve. This causes the
control valve to send hydraulic power to the retract side of the
hydraulic motor.
The hydraulic power from the flap control unit goes to the flap
bypass valve. This valve stops the hydraulic power to the
hydraulic motor during non-normal operations. When the
bypass valve is in the normal position, it allows hydraulic
power from the flap control valve to go to the TE flap hydraulic
motor.
When the bypass valve moves to 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.
The hydraulic motor is a reversible motor that moves the TE
flap drive system to move the TE flaps. The TE flap drive system
moves the follow-up cables, which move the summing lever.
When the TE flaps move to the correct position, the main spool
of the control valve moves to the center position. The control
valve then stops the hydraulic power to the hydraulic motor.
It takes approximately 38 seconds for the TE flaps to fully extend
or fully retract during normal operation.
TE FLAP SYSTEM - FUNCTIONAL DESCRIPTION - HYDRAULIC OPERATION
EFFECTIVITY
GUN ALL 27-51-00
Page 58
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-020
TE FLAP SYSTEM - FUNCTIONAL DESCRIPTION - HYDRAULIC OPERATION
TE FLAP SYSTEM - FUNCTIONAL DESCRIPTION - HYDRAULIC OPERATION
EFFECTIVITY
GUN ALL 27-51-00
Page 59
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-020
General
The alternate flaps arm switch and the FSEU control the position
of the bypass valve. The bypass valve prevents the TE flap
hydraulic motor operation during these conditions:
* Alternate flap operation
* TE flap skew
* TE flap asymmetry
* TE flap uncommanded motion (UCM).
The FSEU BITE also operates the bypass valve during the TE
ASYM-SKW-IND test.
When the bypass valve is in the normal position, it lets hydraulic
power from the TE flap control valve go to the TE flap hydraulic
motor. When the bypass valve moves to the bypass position, it
stops the hydraulic flow to the hydraulic motor.
Alternate Flap Operation
The bypass valve is in the normal position during the hydraulic
operation of the TE flaps. When you move the alternate flaps
　
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