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The TE flaps have nine positions. The TE flaps are fully
extended when the flap lever is at the 40 detent position.
Training Information Point
There are three hoist points for each TE flap. A spreader bar is
not necessary to lift the TE flaps.
TE FLAP SYSTEM - INBOARD AND OUTBOARD FLAPS
EFFECTIVITY
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TE FLAP SYSTEM - INBOARD AND OUTBOARD FLAPS
TE FLAP SYSTEM - INBOARD AND OUTBOARD FLAPS
EFFECTIVITY
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THIS PAGE IS INTENTIONALLY LEFT BLANK
TE FLAP SYSTEM - INBOARD AND OUTBOARD FLAPS
27-51-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Normal Operation
You use the flap lever to operate the TE flaps during normal
operation. The normal operation requires system B hydraulic
power.
The TE flaps move to nine different positions. The flap position
indicator in the flight deck shows the position of the TE flaps.
During normal operation of the TE flaps, the LE devices move
also.
Flap load relief is available during normal operation. If the
airspeed increases more than the flap placard limit for the flap
position, the flaps automatically retract to the next lower flap
position. This occurs at flap position 30 and 40. The flap position
indicator shows the actual position of the TE flaps, except
during a flap skew condition.
If the TE flaps do not stay in alignment or if they move away
from their commanded position, the TE flaps stop automatically.
If this occurs, you can not operate the TE flaps again until the
airplane lands and you correct the problem. The flap position
indicator gives you indication that the TE flaps are out of
alignment.
It takes approximately 38 seconds for the TE flaps to fully extend
or fully retract during the normal operation.
Alternate Operation
You use the alternate flaps switches to operate the TE flaps
during alternate operation. The alternate operation uses
electric power instead of hydraulic power.
When you move the alternate flaps arm switch to the ARM
position, this occurs:
* TE flap bypass valve moves to the bypass position
* Standby hydraulic pump starts
* Electrical power goes to the alternate flaps control switch.
The alternate flaps control switch operates only when you move
the arm switch to the ARM position. When you move and hold
the control switch in the DOWN position, the TE flaps and LE
devices extend. To stop the extension of the TE flaps, move the
control switch to the OFF position. To stop the extension of the
LE devices, move the arm switch to the OFF position.
During alternate operation, the TE flaps can extend to the 40 unit
position. It takes approximately 2 minutes and 39 seconds for
the TE flaps to fully extend or fully retract during alternate
operation.
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.
TE FLAP SYSTEM - OPERATION
EFFECTIVITY
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To retract the TE flaps, move the control switch to the UP
position. The control switch has a detent at the UP position,
thus, you do not have to hold the switch in the UP position.
There are limit switches in the flap control unit that stop the
flaps at the up and down limits. You cannot retract the LE
devices using the alternate operation.
During alternate operation, load relief does not operate. Also,
TE flap skew detection, asymmetry detection, and UCM
detection are not available.
When you move the arm switch from the ARM position to the
OFF position, alternate operation stops 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
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
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