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Jun 10/2005
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SUBTASK 27-31-00-860-002
CAUTION: DO NOT OPERATE THE SYSTEM A OR B HYDRAULIC PUMPS FOR MORE THAN TWO
MINUTES WITHOUT FUEL IN THE FUEL TANKS. THE NO. 1 (FOR SYSTEM A) AND NO.
2 (FOR SYSTEM B) FUEL TANKS MUST HAVE A MINIMUM OF 250 GALLONS (1675
POUNDS/760 KILOGRAMS) OF FUEL IN THEM. IF THERE IS NOT SUFFICIENT FUEL IN
THE FUEL TANKS, THE HYDRAULIC SYSTEMS WILL BECOME TOO HOT.
(2) Make sure the No. 1 and No. 2 fuel tanks each have 250 gallons (1675 pounds/760 kilograms) of
fuel in them.
SUBTASK 27-31-00-210-001
(3) Make sure the hydraulic reservoirs are full. To fill them, do this task: Hydraulic Reservoir
Servicing, TASK 12-12-00-610-801.
SUBTASK 27-31-00-860-003
(4) Make sure that these circuit breakers are closed:
F/O Electrical System Panel, P6-2
Row Col Number Name
B 13 C00363 FLIGHT CONTROL SHUTOFF VALVES FLT CONT
C 11 C00362 FLIGHT CONTROL SHUTOFF VALVES STBY RUD
C 13 C01074 FLIGHT CONTROL SHUTOFF VALVES FLT CONT
SUBTASK 27-31-00-860-004
(5) Set the parking brake.
SUBTASK 27-31-00-480-001
WARNING: MAKE SURE THAT THE GROUND LOCKS ARE INSTALLED IN ALL OF THE LANDING
GEAR BEFORE YOU PRESSURIZE THE HYDRAULIC SYSTEMS. WITHOUT THE
GROUND LOCKS, THE LANDING GEAR CAN RETRACT AND CAUSE INJURIES TO
PERSONS AND DAMAGE TO EQUIPMENT.
(6) Install the ground lock assemblies in the nose gear. To install them, do this task: Landing Gear
Downlock Pins Installation, TASK 32-00-01-480-801.
SUBTASK 27-31-00-860-005
WARNING: KEEP PERSONS AND EQUIPMENT CLEAR OF THE FLIGHT CONTROL SURFACES.
THESE COMPONENTS CAN MOVE SUDDENLY WHEN YOU SUPPLY HYDRAULIC
POWER. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
(7) Pressurize the elevator hydraulic system A:
(a) Set the ELEC 2, HYD PUMPS A switch on the forward overhead panel to the ON position.
(b) To pressurize the hydraulic system A, set the FLT CONTROL A switch on the forward
overhead panel to the ON position.
SUBTASK 27-31-00-780-001
WARNING: KEEP PERSONS AND EQUIPMENT CLEAR OF THE FLIGHT CONTROL SURFACES.
THESE COMPONENTS CAN MOVE SUDDENLY WHEN YOU SUPPLY HYDRAULIC
POWER. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
(8) Pressurize the elevator hydraulic system B:
(a) Set the ELEC 1, HYD PUMPS B switch on the forward overhead panel to the ON position.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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Page 202
Oct 10/2005
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(b) To pressurize the hydraulic system B, set the FLT CONTROL B switch on the forward
overhead panel to the ON position.
------------------------- END OF TASK ---------------------------
737-600/700/800/900
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EFFECTIVITY
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Elevator Power Control Switches
Figure 201/27-31-00-990-801
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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TASK 27-31-00-840-801
3. Put the Elevator Hydraulic systems A and B Back to the Condition Before the Pressurization
(Figure 201)
A. References
Reference Title
32-00-01-080-801 Landing Gear Downlock Pins Removal (P/B 201)
B. Location Zones
Zone Area
133 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station
727.00 - Left
134 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station
727.00 - Right
210 Subzone - Control Compartment - Body Station 178.00 to Body
Station 259.50
C. Procedure
SUBTASK 27-31-00-860-006
(1) Set the ELEC 2, HYD PUMPS A and the ELEC 1, HYD PUMPS B switches on the forward
overhead panel to the OFF position.
SUBTASK 27-31-00-860-007
(2) Set the FLT CONTROL A and B switches on the forward overhead panel to the OFF position.
SUBTASK 27-31-00-080-001
(3) Remove the ground lock assemblies from the nose gear. To remove them, do this task: Landing
Gear Downlock Pins Removal, TASK 32-00-01-080-801.
------------------------- END OF TASK ---------------------------
TASK 27-31-00-800-802
4. Remove Pressure from the Elevator Hydraulic Systems A and B
(Figure 201, Figure 202)
A. References
Reference Title
29-09-00-860-802 Hydraulic Reservoirs Depressurization (P/B 201)
29-11-01-860-802 Hydraulic Reservoirs Depressurization (P/B 201)
　
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