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BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
Close these access panels:
Number Name/Location
331A Horizontal Stabilizer, Gap Cover
331AZ Horizontal Stabilizer, Access Panel, Inboard L.E.
Closure Rib
332AB Horizontal Stabilizer, Gap Cover, Horizontal
Stabilizer to Body
SUBTASK 27-41-31-410-002
(2) For the right hinge fitting, do this step:
Close these access panels:
Number Name/Location
341A Horizontal Stabilizer, Gap Cover
341AZ Horizontal Stabilizer, Access Panel - Inbd L.E.
Closure Rib
342AB Horizontal Stabilizer, Gap Cover - H. Stab. to Body
SUBTASK 27-41-31-860-004
(3) Set the stabilizer trim cutout switches to the NORMAL position.
SUBTASK 27-41-31-860-005
(4) Remove the safety tags and close these circuit breakers:
CAPT Electrical System Panel, P18-1
Row Col Number Name
C 2 C00849 AFCS STABILIZER TRIM
F/O Electrical System Panel, P6-2
Row Col Number Name
B 10 C00207 FLIGHT CONTROL STAB TRIM CONT
D 10 C00840 FLIGHT CONTROL STAB TRIM ACTUATOR
------------------------- END OF TASK ---------------------------
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BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
STABILIZER FORWARD CONTROL MECHANISM - REMOVAL/INSTALLATION
1. General
A. This procedure has these tasks:
(1) A removal of the stabilizer forward control mechanism
(2) An installation of the stabilizer forward control mechanism.
B. The stabilizer forward control mechanism is referred to as the "forward mechanism" in this
procedure.
TASK 27-41-41-000-801
2. Stabilizer Forward Control Mechanism Removal
(Figure 401)
A. References
Reference Title
24-22-00-860-811 Supply Electrical Power (P/B 201)
B. Location Zones
Zone Area
112 Area Forward of Nose Landing Gear Wheel Well
211 Flight Compartment - Left
212 Flight Compartment - Right
C. Access Panels
Number Name/Location
112A Forward Access Door
311BL Stabilizer Trim Access Door
D. Prepare for the Removal
SUBTASK 27-41-41-860-001
(1) Do this task: Supply Electrical Power, TASK 24-22-00-860-811.
SUBTASK 27-41-41-860-002
(2) Make sure that these circuit breakers are closed:
F/O Electrical System Panel, P6-2
Row Col Number Name
B 10 C00207 FLIGHT CONTROL STAB TRIM CONT
D 10 C00840 FLIGHT CONTROL STAB TRIM ACTUATOR
SUBTASK 27-41-41-860-003
(3) Move the stabilizer to the full APL NOSE UP position.
SUBTASK 27-41-41-860-004
(4) Open these circuit breakers and install safety tags:
F/O Electrical System Panel, P6-2
Row Col Number Name
B 10 C00207 FLIGHT CONTROL STAB TRIM CONT
D 10 C00840 FLIGHT CONTROL STAB TRIM ACTUATOR
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BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
SUBTASK 27-41-41-010-001
(5) To get access to the forward control mechanism [43], do this step:
Open this access panel:
Number Name/Location
112A Forward Access Door
SUBTASK 27-41-41-010-003
(6) Open this access panel:
Number Name/Location
311BL Stabilizer Trim Access Door
E. Forward Mechanism Removal
(Figure 401)
SUBTASK 27-41-41-020-012
(1) Remove the drip shield [44] from the forward control mechanism [43]:
(a) Remove the nuts [47], washers [46], and bolts [45] from the drip shield [44].
(b) Remove the clamp [48] and clamp pad [49] from the drip shield [44].
(c) Remove the drip shield [44].
SUBTASK 27-41-41-820-001
CAUTION: MAKE SURE THE CHAIN IS LOOSE BEFORE YOU RELEASE THE CABLE TENSION.
TOO MUCH CABLE TENSION CAN CAUSE DAMAGE TO THE CHAIN.
(2) Adjust the upper adjusting nuts [24] of the aft support link [22] to loosen the chain [8].
SUBTASK 27-41-41-020-001
(3) Loosen the lower turnbuckle [1] to release the cable tension.
SUBTASK 27-41-41-020-003
(4) Remove the nuts [42] and washers [41] to remove the cable guard [40] from the cable drum [39].
SUBTASK 27-41-41-020-004
(5) Remove the STA cable from the bottom of the cable drum [39].
(a) Put a 50 pound (5.7 newton-meters) load on the trim control wheel to extend the STB cable
and make the removal of the STA cable easier.
(b) Install a tag to the STA cable for easy installation.
SUBTASK 27-41-41-020-005
(6) Disconnect the flexible shaft [21] from the forward control mechanism [43].
SUBTASK 27-41-41-020-006
(7) Turn the trim control wheel until the connector link [11] of the chain [8] is between the idler
　
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