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CONTROL LEVER. WHEN YOU SUPPLY
HYDRAULIC POWER, THE FLAPS AND SLATS
WILL MOVE AUTOMATICALLY TO THE POSITION
OF THE FLAP CONTROL LEVER. THIS CAN CAUSE
INJURY TO PERSONS AND DAMAGE TO
EQUIPMENT.
Training Information Point
NOTE: The standby electric motor-driven pump (EMDP)
operates when you move the alternate flaps arm
switch to the arm position.
See the standby hydraulic system section for more information
on the standby EMDP. (SECTION 29-22)
TE FLAP SYSTEM - ALTERNATE FLAPS SWITCHES
EFFECTIVITY
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TE FLAP SYSTEM - ALTERNATE FLAPS SWITCHES
TE FLAP SYSTEM - ALTERNATE FLAPS SWITCHES
EFFECTIVITY
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Purpose
The flap control quadrant transmits pilot inputs from the flap
lever to the flap control unit.
Location
The flap control quadrant is above the MLG wheel well. To get
access, remove a floor panel in the passenger cabin.
Physical Description
A cable assembly from the flap lever attaches to the flap control
quadrant and a pulley.
Functional Description
Flap lever movement causes the cable assembly to move the
flap control quadrant. The quadrant turns an input shaft to
operate the flap control unit in the MLG wheel well.
TE FLAP SYSTEM - FLAP CONTROL QUADRANT
EFFECTIVITY
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TE FLAP SYSTEM - FLAP CONTROL QUADRANT
TE FLAP SYSTEM - FLAP CONTROL QUADRANT
EFFECTIVITY
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TE FLAP SYSTEM - FLAP CONTROL QUADRANT
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Purpose
The flap control unit receives mechanical inputs from the pilots
and sends hydraulic power to the flap PDU and the slat
actuators. The flap control unit also causes the TE flaps to
retract during load relief operation.
Location
The flap control unit is in the MLG wheel well on the right side of
the ceiling, near the aft bulkhead.
Physical Description
The flap control unit has these components:
* Input rod
* Summing lever
* TE flap control valve link
* TE flap control valve
* LE flap control valve link
* LE flap control valve
* Follow-up drum
* Cam rollers
* Flap position switches.
See the leading edge (LE) flap and slat control system section
for more information on the LE flap control valve and the LE flap
control valve link. (SECTION 27-81)
The TE flap control valve receives mechanical and electrical
inputs and sends hydraulic power to the flap PDU. The flap load
relief solenoid is on the TE flap control valve. When this
solenoid energizes, the TE flaps retract from the flaps 40 or 30
positions to the next lower position.
These are the four TE flap position switches:
* TE flap up switch (S245)
* TE flap down switch (S246)
* TE flap switch (S1051)
* Flap landing warning switch (S138).
TE Flap Position Switches Interfaces
The TE flap up switch (S245) operates at the up position and
interfaces with these components/systems:
* Alternate TE flap system to limit the position of the TE flaps
during alternate operation
* Stabilizer system for stab trim speed control
* SMYDs to limit yaw damper authority
* Passenger cabin signs control.
The TE flap down switch (S246) operates at the 40 unit position
and interfaces with the alternate TE flap system to limit the
position of the TE flaps during alternate operation.
The TE flap switch (S1051) operates at the up position and
interfaces with these components/systems:
TE FLAP SYSTEM - FLAP CONTROL UNIT
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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