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27-21-00-840-802 Put the Rudder Systems A, B, and Standby Back to the Condition
Before the Pressure Removal (P/B 201)
SWPM 20-60-03 Standard Wiring Practices Manual
C. Consumable Materials
Reference Description Specification
D00153 Fluid - Hydraulic, Erosion Arresting, Fire Resistant BMS3-11, Type
IV
(interchange~
able&
intermixable
with Type V)
G01048 Lockwire - Corrosion Resistant Steel (0.032 In. Dia.) NASM20995~
C32
G50171 Compound - Corrosion Inhibiting Compound,
Interior Application - D5026NS or ZC-026
D. Location Zones
Zone Area
133 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station
727.00 - Left
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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E. Procedure
SUBTASK 27-21-94-420-004
(1) If the shutoff valve does not have the packings [8], packing [10], backup rings [7], and backup
rings [11] installed, do these steps:
(a) Lubricate the packings [8], packing [10], backup rings [7], and backup rings [11] with fluid,
D00153.
(b) Install the packings [8], packing [10], backup rings [7], and backup rings [11] to the shutoff
valve [1].
SUBTASK 27-21-94-420-005
(2) Carefully install the shutoff valve [1] in the modular package assembly [9].
SUBTASK 27-21-94-420-006
(3) Install the washers [12] and screws [13] which attach the shutoff valve [1] to the modular
package assembly [9].
(a) Tighten the screws [13] to 30-40 pound-inches (3.4-4.5 newton-meters).
SUBTASK 27-21-94-420-007
(4) Install the lockwire, G01048 on the screws [13].
SUBTASK 27-21-94-210-002
(5) Before you connect the electrical connector [5], examine the connector for corrosion.
WARNING: DO THE STEPS BELOW IF THE AIRPLANE OPERATES AT AIRPORTS WHERE
DEICING FLUID THAT CONTAIN POTASSIUM FORMATE IS USED. ALSO DO THE
STEPS FOR ALL AIRPLANES THAT YOU FOUND CORROSION IN THE
ELECTRICAL CONNECTORS IN THE MAIN WHEEL WELL. THE ELECTRICAL
CONNECTOR IS PART OF A SYSTEM THAT IS NECESSARY FOR SAFE FLIGHT.
(a) If there was corrosion, refer to (SWPM 20-60-03) to correct the problem.
(b) Apply the D5026NS or ZC-026 compound, G50171 to the connector (SWPM 20-60-03).
SUBTASK 27-21-94-420-008
(6) Connect the electrical connector [5] to the rudder valve motor [4].
SUBTASK 27-21-94-860-006
(7) Do this task: Put the Rudder Systems A, B, and Standby Back to the Condition Before the
Pressure Removal, TASK 27-21-00-840-802.
SUBTASK 27-21-94-860-017
(8) Remove the safety tags and close these circuit breakers:
F/O Electrical System Panel, P6-2
Row Col Number Name
C 11 C00362 FLIGHT CONTROL SHUTOFF VALVES STBY RUD
C 13 C01074 FLIGHT CONTROL SHUTOFF VALVES FLT CONT
SUBTASK 27-21-94-710-001
(9) Do this task: Standby Rudder PCU Shutoff Valve Installation Test, TASK 27-21-94-710-801.
SUBTASK 27-21-94-860-007
(10) If it is necessary, do this task: Hydraulic Reservoir Servicing, TASK 12-12-00-610-801.
------------------------- END OF TASK ---------------------------
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AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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TASK 27-21-94-710-801
6. Standby Rudder PCU Shutoff Valve Installation Test
(Figure 201, Figure 202)
A. References
Reference Title
24-22-00-860-811 Supply Electrical Power (P/B 201)
27-21-00-800-801 Rudder Hydraulic System A, B, or Standby Pressurization (P/B 201)
27-21-00-840-801 Put the Rudder Hydraulic systems A, B, and Standby Back to the
Condition Before the Pressurization (P/B 201)
B. Location Zones
Zone Area
133 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station
727.00 - Left
211 Flight Compartment - Left
C. Procedure
SUBTASK 27-21-94-860-008
(1) Do this task: Supply Electrical Power, TASK 24-22-00-860-811.
SUBTASK 27-21-94-860-018
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS,
ELEVATORS, FLAPS, SPOILERS, SLATS, AND THRUST REVERSERS CAN MOVE
QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN INJURY TO PERSONS
AND DAMAGE TO EQUIPMENT.
(2) Do this task: Rudder Hydraulic System A, B, or Standby Pressurization,
TASK 27-21-00-800-801.
SUBTASK 27-21-94-860-010
(3) Make sure the FLIGHT CONTROL A and B switches are in the ON position.
NOTE: The FLIGHT CONTROL A and B switches are on the upper left corner of the pilot’s
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL飞机维护手册2(122)
