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Leading Edge Flap and Slat Locks Removal, TASK 27-81-00-080-801.
SUBTASK 27-81-00-020-001
(2) Remove the DO-NOT-REMOVE tag from the rig pin or tool, SPL-1746 in the manual override
lever on the LE cruise depressurization valve.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
SUBTASK 27-81-00-020-002
(3) Remove the rig pin or tool, SPL-1746 from the manual override lever on the LE cruise
depressurization valve (Figure 201).
(a) Make sure the manual override lever moves from the OFF position to the ON position.
(b) Install lockwire on the manual override lever.
SUBTASK 27-81-00-020-003
(4) Remove the DO-NOT-OPERATE tags from the flap control lever and the ALTERNATE FLAPS
switches.
SUBTASK 27-81-00-410-005
(5) If it is open, close this access panel:
Number Name/Location
117A Electronic Equipment Access Door
F. Reactivate the Leading Edge Flaps and Slats In the Full Extend Position
SUBTASK 27-81-00-480-007
WARNING: MAKE SURE TO INSTALL THE LEADING EDGE FLAP AND SLAT ACTUATORS
LOCKOUT SET TO PREVENT ACCIDENTAL OPERATION OF THE LEADING EDGE
FLAPS AND SLATS. THE LEADING EDGE FLAPS AND SLATS CAN MOVE QUICKLY.
THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(1) Remove the lockout set, SPL-1734 from the extended actuators of the leading edge flaps and
slats. To remove the locks, do this task: Leading Edge Flap and Slat Locks Removal,
TASK 27-81-00-080-801.
G. Put the Airplane Back to Its Usual Condition
SUBTASK 27-81-00-860-060
(1) Remove the safety tag and close this circuit breaker:
F/O Electrical System Panel, P6-2
Row Col Number Name
A 7 C00210 FLIGHT CONTROL FLAP SHUTOFF VALVES
------------------------- END OF TASK ---------------------------
TASK 27-81-00-860-801
4. Leading Edge Flap and Slat System Operation With Primary Control
A. General
(1) The primary control system uses the hydraulic system B to move the flaps and slats.
B. References
Reference Title
29-11-00-860-801 Hydraulic System A or B Pressurization (P/B 201)
29-11-00-860-805 Hydraulic System A or B Power Removal (P/B 201)
C. Location Zones
Zone Area
211 Flight Compartment - Left
212 Flight Compartment - Right
737-600/700/800/900
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EFFECTIVITY
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D. Procedure
SUBTASK 27-81-00-860-004
WARNING: MAKE SURE ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE FLIGHT CONTROL
SURFACES, THE THRUST REVERSERS, AND THE LANDING GEAR. THESE
COMPONENTS CAN MOVE SUDDENLY WHEN YOU SUPPLY HYDRAULIC POWER.
THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
(1) To pressurize hydraulic system B, do this task: Hydraulic System A or B Pressurization,
TASK 29-11-00-860-801.
SUBTASK 27-81-00-860-005
WARNING: MAKE SURE ALL PERSONS AND EQUIPMENT ARE CLEAR FROM THE LEADING
EDGE FLAPS AND SLATS, AND THE TRAILING EDGE FLAPS. THESE SURFACES WILL
MOVE AND CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
CAUTION: MAKE SURE THE INBOARD FAN DUCT COWL AND THE INBOARD AND OUTBOARD
THRUST REVERSERS ARE CLOSED OR REMOVED BEFORE YOU EXTEND THE
LEADING EDGE FLAPS AND SLATS. THERE IS NOT SUFFICIENT CLEARANCE FOR
THE FLAPS AND SLATS TO EXTEND IF THE INBOARD FAN DUCT COWL AND THE
INBOARD AND OUTBOARD THRUST REVERSERS ARE IN THE OPEN POSITION. THIS
CAN CAUSE DAMAGE TO EQUIPMENT.
(2) Move the flap control lever to the applicable detent position (Table 201).
Table 201/27-81-00-993-803 Leading Edge (LE) Flap and Slat Position
Flap Control Lever Detent Position LE Flap Position LE Slat Position
UP Retract Retract
1 and 5 Full Extend Extend
10 thru 40 Full Extend Full Extend
E. Put the Airplane Back to Its Usual Condition
SUBTASK 27-81-00-860-006
(1) To remove power from hydraulic system B, do this task: Hydraulic System A or B Power
Removal, TASK 29-11-00-860-805.
------------------------- END OF TASK ---------------------------
TASK 27-81-00-860-802
5. Leading Edge Flap and Slat System Operation With Alternate Control
A. General
(1) The alternate control system uses electrical power to power the standby hydraulic system which
moves the leading edge slats and flaps.
B. References
Reference Title
24-22-00-860-811 Supply Electrical Power (P/B 201)
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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