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27-51-00-008
* Elevator feel system to enable the FEEL DIFF PRESS light
* Right elevator tab solenoid valve
* Standby hydraulic system to enable the automatic operation
* Power transfer unit (PTU) system to enable the automatic
operation
* Air conditioning system to operate the left ram air actuator.
The flap landing warning switch (S138) operates at the 15 unit
position and interfaces with these components/systems:
* PSEU for landing gear red lights and aural warning
* PSEU for SPEEDBRAKES EXTENDED light
* PTU system to disable the automatic operation.
NOTE: The TE flap up switch (S245) and the TE flap switch
(S1051) close when the TE flaps move to the up
position, but they are rigged differently. Because of
this, the TE flap up switch (S245) operates closer to the
up stop than the TE flap switch (S1051).
Functional Description
The flap lever moves the flap control quadrant, which moves the
input rod and summing lever. The summing lever moves the TE
flap control valve, which sends hydraulic power to the TE flap
PDU. As the TE flaps move, the follow-up cables move the
follow-up drum. The follow-up drum moves three cam rollers.
One of the cam rollers causes the TE flap control valve link to
move. This link moves the summing lever in the opposite
direction to cause the TE flap control valve to move to the
neutral position. This stops the hydraulic power to the TE flap
PDU.
A second cam roller operates the TE flap position switches.
The third cam roller causes the LE flap control valve link to
move, which moves the LE flap control valve.
Training Information Point
If there is too much internal leakage in the TE flap control valve,
you can repair it to reduce the leakage. It is not necessary to
remove the TE flap control valve to do this repair.
Install the rig pin during adjustment of the flap control unit.
Remove the cover on the bottom of the flap control unit to install
the rig pin.
CAUTION: DO NOT INSTALL THE RIG PIN IN THE FLAP
CONTROL UNIT WITH THE HYDRAULIC SYSTEM
PRESSURIZED. YOU CAN CAUSE DAMAGE TO
THE FLAP CONTROL UNIT.
TE FLAP SYSTEM - FLAP CONTROL UNIT
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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TE FLAP SYSTEM - FLAP CONTROL UNIT
TE FLAP SYSTEM - FLAP CONTROL UNIT
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
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THIS PAGE IS INTENTIONALLY LEFT BLANK
TE FLAP SYSTEM - FLAP CONTROL UNIT
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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 TE flap power drive unit (PDU) uses hydraulic or electric
power to turn the TE flap torque tubes and the follow-up cables.
Location
The flap PDU is on the aft bulkhead of the MLG wheel well.
Physical Description
The flap PDU has these components:
* Gearbox
* Hydraulic motor
* Electric motor.
The gearbox transfers power from the hydraulic and electric
motors to the flap torque tubes. As the torque tubes turn, the
gearbox moves the follow-up cables that attach to the flap
control unit. The gearbox is oil- filled.
There is a 3/8-inch manual drive connection on the flap PDU that
lets you manually move the TE flaps. Remove the manual drive
cover to get access to the manual drive input shaft.
The hydraulic motor is a reversible, nine cylinder piston-type
motor. Case drain hydraulic fluid lubricates the hydraulic motor.
A check valve attaches to the case drain hydraulic port.
The electric motor is a three-phase, 400 Hz, 115v ac motor with
these components:
* Clutch
* Solenoid
* Overload mechanism.
During hydraulic operation of the TE flaps, the clutch
disengages. This helps prevent damage to the electric motor.
When the electric motor receives electric power, the solenoid
engages the clutch. This lets the electric motor turn the PDU
gears.
The overload mechanism in the electric motor disengages the
clutch if a jam occurs in the PDU gearbox or the flap torque
tubes.
Training Information Point
The flap PDU is in a rig position when the black alignment mark
on the follow-up cable drum shows on both sides of the white
cable guard.
When you operate the TE flaps on the ground with the alternate
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