Installation of the Centering Rod of the Rudder Control

TASK 27-21-48-400-001-A
Installation of the Centering Rod of the Rudder Control

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

WARNING: PRESSURIZE ONLY THE HYDRAULIC SYSTEM(S) THAT IS (ARE) NECESSARY FOR THE TASK. ISOLATE THE OTHER HYDRAULIC SYSTEM(S) BEFORE YOU SUPPLY HYDRAULIC POWER TO THE AIRCRAFT.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 325

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 10M (33 FT) - ADJUSTABLE
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.77 and 0.63 m.daN (68.14 and 55.75 lbf.in )
98D27207545000	1	PIN-RIGGING

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03GBD1)	Synthetic Oil base Grease-General Purpose Lithium Thickened -
(Material No.03HBD9)	Synthetic Ester base Grease-General Purpose Low Temp -
(Material No.05ABF1)	Retaining adhesive-Cylindrical fitting Medium strength Low viscosity -
(Material No.06LCG9)	Non Hardening Jointing Putty-Medium Temp. Area - -
No specific	lockwire corrosion-resistant steel 0.8 mm (0.032 in.)

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
325	VERTICAL STABILIZER TRAILING EDGE
325DL, 325DR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
11	COTTER PIN	AIPC 27-21-04-11-050
4	COTTER PIN	AIPC 27-21-04-11-050
11	COTTER PIN	AIPC 27-21-84-13-010
4	COTTER PIN	AIPC 27-21-84-13-010

E. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 27-21-00-720-002-A	Functional Test of the Rudder Mechanical Control
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 55-33-13-010-002-A	Opening/Removal of the Trailing Edge Access-Panels of the Vertical Stabilizer
TASK 55-33-13-410-002-A	Closing/Installation of the Trailing Edge Access-Panels of the Vertical Stabilizer
Centering Rod - Rudder Control

3. Job Set-up
Subtask 27-21-48-860-052-B

A. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 10M (33 FT) - ADJUSTABLE is in position at zone 325.
(2) Make sure that the access panel 325DL is open and the access panel 325DR is removed (Ref. AMM TASK 55-33-13-010-002).
(3) Make sure that the rudder pedals are in the neutral position.
(4) Make sure that the RUD TRIM indicator on the center pedestal, on the panel 110VU shows 0.
(5) Make sure that the WARNING NOTICE(S) are in position in the cockpit to tell persons not to operate the flight controls.
(6) Make sure that the hydraulic systems are depressurized and put them in the maintenance configuration
(Ref. AMM TASK 29-00-00-864-001).
(7) Make sure that the aircraft electrical circuits are de-energized (Ref. AMM TASK 24-41-00-862-002).
(8) Make sure that the warning notices are in position to tell persons not to pressurize the Green, the Yellow and the Blue hydraulic systems:

in the cockpit on the hydraulic section 40VU of the overhead panel,
on the ground service panels of the Green, Yellow and Blue hydraulic systems.

(9) Make sure that the PIN - RIGGING (98D27207545000) (20) is in position in the bellcrank assembly (2) of the travel limitation unit (3).

Subtask 27-21-48-865-051-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AUTO FLT/FAC1/28VDC	5CC1	B04
49VU	AUTO FLT/FAC1/26VAC	14CC1	B03
** ON A/C NOT FOR ALL
49VU	AUTO FLT/FAC1/28VDC	5CC1	H10
49VU	AUTO FLT/FAC1/26VAC	14CC1	H09
** ON A/C ALL
121VU	AUTO FLT/RUDDER/TRIM/IND	15CC	M20
121VU	AUTO FLT/FAC2/28VDC	5CC2	M19
121VU	AUTO FLT/FAC2/26VAC	14CC2	M18

Subtask 27-21-48-210-050-A

C. Examination of the Work Area, the Attachment Components and the Replacement Centering Rod
(1) Examine the work area.
(a) Make sure that:

the structure,
the paintwork,
the bellcrank assembly (2),
the travel limitation unit (3)

are clean and show no damage.
(b) Make sure that the control rods are correctly installed at the bellcrank assembly (2) and the travel limitation unit (3).
(c) Make sure that the bellcrank assembly (2) and the travel limitation unit (3) are correctly installed on the support bracket.
(2) Examine the attachment components.
(a) Cut and remove the lockwire which temporarily safeties the sliding bushes (7),(14) in the flanged bushes (8),(15).
(b) Remove the sliding bushes (7),(14).
(c) Make sure that:

the nuts (5),(12),
the bushes (7),(8),(9),(14),(15),(16),
the bolts (10),(17)

are clean and show no damage.
(d) Make sure that the bushes (15),(16) are tight in the lever arm of the bellcrank assembly (2).

NOTE: Safety the bushes (15),(16) in the lever arm of the bellcrank assembly (2) if necessary, with Retaining adhesive-Cylindrical fitting Medium strength Low viscosity - (Material No.05ABF1) .

(3) Examine the replacement centering rod (1).
(a) Make sure that:

the centering rod (1) is serviceable,
the bushes (8),(9) are correctly installed in the fork-end,
the bushes (8),(9) and the eye-end bearing are clean and show no damage,
the drain and vent holes are clean,
the lock-nut (19) is not safetied to the safety washer (18).

4. Procedure
Subtask 27-21-48-640-050-A

A. Preparation for Installation
(1) Apply Synthetic Oil base Grease-General Purpose Lithium Thickened - (Material No.03GBD1) or Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) to the threads of the bolts (10),(17).
(2) Apply Synthetic Oil base Grease-General Purpose Lithium Thickened - (Material No.03GBD1) or Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) to the sliding bushes (7),(14).
(3) Apply Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to the shafts of the bolts (10),(17).

Subtask 27-21-48-420-050-A

B. Installation of the Centering Rod
(1) Put the sliding bush (7) in the flanged bush (8) at the fork-end of the centering rod (1).
(2) Put the fork-end of the centering rod (1) in position on the attachment bracket.
(3) Install the bolt (10).
(4) Put the sliding bush (14) in the flanged bush (15) at the lever arm of the bellcrank assembly (2).
(5) Put the eye-end of the centering rod (1) in position in the lever arm of the bellcrank assembly (2).
(6) Align the hole in the eye-end bearing with the hole in the lever arm of the bellcrank assembly (2).
(a) Cut and remove the lockwire from the lock-nut (19) and the safety washer (18).
(b) Release the lock-nut (19).
(c) Turn the eye-end and adjust the length of the centering rod (1) as necessary.

NOTE: Make sure that the centering rod (1) is in safety (the threads can be seen at the inspection hole).

(d) Put the eye-end of the centering rod (1) in position in the lever arm.
(e) Make sure that you can install the bolt (17) smoothly.
(f) Do the steps (c),(d) and (e) again if necessary.
(g) Tighten the lock-nut (19).
(h) Install the bolt (17).
(i) Safety the lock-nut (19) to the safety washer (18) with lockwire corrosion-resistant steel 0.8 mm (0.032 in.).
(7) Connect the centering rod (1) to the attachment bracket.
(a) Install the washer (6) and the nut (5) on the bolt (10).
(b) TORQUE the nut (5) to between 0.77 and 0.63 m.daN (68.14 and 55.75 lbf.in )

and then loosen it, if necessary, to the next cotter pin hole.
(c) Safety the nut (5) with a new AIPC 27-21-04-11-050 COTTER PIN (4) or AIPC 27-21-84-13-010 COTTER PIN (4).
(8) Connect the centering rod (1) to the bellcrank assembly (2).
(a) Install the washer (13) and the nut (12) on the bolt (17).
(b) TORQUE the nut (12) to between 0.77 and 0.63 m.daN (68.14 and 55.75 lbf.in )

and then loosen it, if necessary, to the next cotter pin hole.
(c) Safety the nut (12) with a new AIPC 27-21-04-11-050 COTTER PIN (11) or AIPC 27-21-84-13-010 COTTER PIN (11).

Subtask 27-21-48-860-051-A

C. Preparation for Test
(1) Remove the 98D27207545000 PIN-RIGGING (20) from the bellcrank assembly.
(2) On the overhead panel 23VU, push the FLT CTL/FAC 1 pushbutton switch. The OFF legend goes off.
(3) On the overhead panel 24VU, push the FLT CTL/FAC 2 pushbutton switch. The OFF legend goes off.

Subtask 27-21-48-865-052-A

D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AUTO FLT/FAC1/28VDC	5CC1	B04
49VU	AUTO FLT/FAC1/26VAC	14CC1	B03
** ON A/C NOT FOR ALL
49VU	AUTO FLT/FAC1/28VDC	5CC1	H10
49VU	AUTO FLT/FAC1/26VAC	14CC1	H09
** ON A/C ALL
121VU	AUTO FLT/RUDDER/TRIM/IND	15CC	M20
121VU	AUTO FLT/FAC2/28VDC	5CC2	M19
121VU	AUTO FLT/FAC2/26VAC	14CC2	M18

Subtask 27-21-48-710-050-A

E. Test
(1) Do the functional test of the rudder mechanical control (Ref. AMM TASK 27-21-00-720-002).

5. Close-up
Subtask 27-21-48-410-050-B

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access panel 325DL and install the access panel 325DR (Ref. AMM TASK 55-33-13-410-002).
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).

[Rev.10 from 2021] 2026.03.31 23:48:37 UTC