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Rudder Power Control Switches
Figure 201/27-21-00-990-801
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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TASK 27-21-00-840-801
3. Put the Rudder Hydraulic systems A, B, and Standby 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 27-21-00-860-006
(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 27-21-00-860-007
(2) Set the FLT CONTROL A and B switches on the forward overhead panel to the OFF position.
SUBTASK 27-21-00-080-001
(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 27-21-00-800-802
4. Remove Pressure from the Rudder Hydraulic Systems A, B, and Standby
(Figure 201, Figure 202, Figure 203)
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)
B. Tools/Equipment
NOTE: When more than one tool part number is listed under the same "Reference" number, the
tools shown are alternates to each other within the same airplane series. Tool part numbers
that are replaced or non-procurable are preceded by "Opt:", which stands for Optional.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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Reference Description
SPL-1675 Assembly - Lock, Flight Controls
(Part #: F80049-18, Supplier: 81205, A/P Effectivity: 737-100, -200,
-200C, -300, -400, -500, -600, -700, -700C, -700ER, -700QC, -800, -900,
-900ER, -BBJ)
(Opt Part #: F80049-12, Supplier: 81205, A/P Effectivity: 737-100, -200,
-200C, -300, -400, -500, -600, -700, -700C, -700ER, -700QC, -800, -900,
-900ER, -BBJ)
SPL-1676 Assembly - Lock, Flight Controls
(Part #: F80049-17, Supplier: 81205, A/P Effectivity: 737-100, -200,
-200C, -300, -400, -500, -600, -700, -700C, -700ER, -700QC, -800, -900,
-900ER, -BBJ)
C. 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
D. Procedure
SUBTASK 27-21-00-860-008
(1) Set the FLT CONTROL A and B switches on the forward overhead panel to the OFF position.
SUBTASK 27-21-00-860-009
(2) Open these circuit breakers and install safety tags:
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 27-21-00-860-010
(3) 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 27-21-00-870-001
(4) Operate the rudder pedals or the control column to decrease the remaining hydraulic system
pressure.
SUBTASK 27-21-00-860-011
(5) If it is necessary to open a hydraulic line, you must release pressure from the reservoir for the
applicable hydraulic system. To release it, do this task: Hydraulic Reservoirs
Depressurization, TASK 29-11-01-860-802 or Hydraulic Reservoirs Depressurization,
TASK 29-09-00-860-802.
SUBTASK 27-21-00-480-002
(6) Install the flight controls ground locks to the flight controls shutoff valves (Figure 202,
Figure 203):
(a) Disconnect the electrical connector from the flight controls shutoff valve at the flight
controls hydraulic modules A and B.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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