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degrees when the flap lever is up and is at 108 resolver degrees
when the flap lever is at 40.
TE FLAP SYSTEM - FLAP LEVER, POSITION SENSOR, AND POSITION SWITCHES
EFFECTIVITY
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One of the flap lever position switches operates when the flap
lever moves to the up position. The other switch operates at the
30 position.
Operation
To move the flap lever to a new position, you must lift the flap
lever so the index pin moves out of the detent.
Training Information Point
Adjust the flap lever position sensor with the flap lever at 10. To
adjust the sensor, turn the sensor housing and monitor the
position on the FSEU BITE.
TE FLAP SYSTEM - FLAP LEVER, POSITION SENSOR, AND POSITION SWITCHES
EFFECTIVITY
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TE FLAP SYSTEM - FLAP LEVER, POSITION SENSOR, AND POSITION SWITCHES
TE FLAP SYSTEM - FLAP LEVER, POSITION SENSOR, AND POSITION SWITCHES
EFFECTIVITY
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TE FLAP SYSTEM - FLAP LEVER, POSITION SENSOR, AND POSITION SWITCHES
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The two alternate flaps switches control the TE flaps and LE
devices during the alternate operation. These are the alternate
flaps switches:
* Alternate flaps arm switch
* Alternate flaps control switch.
Location
The alternate flaps switches are on the flight control panel on
the P5 overhead panel.
Physical Description
The alternate flaps arm switch is a two position, guarded, toggle
switch. The positions are the arm position and the OFF position.
When the guard is closed, the switch is in the OFF position.
The alternate flaps control switch is a three position toggle
switch with these positions:
* UP
* OFF
* DOWN.
When you put the switch in the UP position, it stays. When you
put it in the DOWN position, it returns to the OFF position when
you release it.
Operation
When the alternate flaps arm switch is in the arm position, this
occurs:
* TE flap bypass valve moves to the bypass position
* Standby electric motor driven pump (EMDP) starts
* Electrical power goes to the alternate flaps control switch.
The alternate flaps control switch operates only when the arm
switch is in the arm position. The control switch controls the
direction of movement of the TE flaps and LE devices.
NOTE: During alternate operation with system B hydraulic
power applied, move the flap lever to the position that
you will move the flaps to. This will decrease the load
on the flap electric motor.
Extend
When you move the control switch to the DOWN position
momentarily, the LE devices use pressure from the standby
EMDP to fully extend. You can not stop the extension of the LE
devices unless you move the alternate flaps arm switch to the
OFF position.
When you hold the control switch in the DOWN position, the TE
flaps use electric power to extend. To stop the extension of the
TE flaps, move the control switch to the OFF position.
TE FLAP SYSTEM - ALTERNATE FLAPS SWITCHES
EFFECTIVITY
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Retract
When the control switch is in the UP position, the TE flaps use
electric power to retract and the LE devices stay in the full
extend position. You can not retract the LE devices during the
alternate operation. To retract the LE devices, use the normal
operation with the flap lever.
Return To Normal Operation
To return to normal operation, move the arm switch from the
ARM position to the OFF position. This stops the alternate
operation and normal operation becomes active. Before you do
this, obey this warning:
WARNING: MAKE SURE THE POSITION OF THE TE FLAPS
AGREES WITH THE POSITION OF THE FLAP
　
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