Removal of the Centering Rod of the Rudder Control

TASK 27-21-48-000-001-A
Removal 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.

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	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
98D27207545000	1	PIN-RIGGING

B. Consumable Materials

REFERENCE	DESIGNATION
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. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
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 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-10-00-863-003-A	Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-003-A-01	Pressurize the Blue Hydraulic System with the Blue Electric Pump
TASK 55-33-13-010-002-A	Opening/Removal of the Trailing Edge Access-Panels of the Vertical Stabilizer
Centering Rod - Rudder Control

3. Job Set-up
Subtask 27-21-48-010-050-B

A. Get Access
(1) Put the ACCESS PLATFORM 10M (33 FT) - ADJUSTABLE in position.
(2) Open the access panel 325DL and remove the access panel 325DR (Ref. AMM TASK 55-33-13-010-002).

Subtask 27-21-48-865-053-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

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 27-21-48-860-050-A

C. Aircraft Maintenance Configuration

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.

(1) Energize the aircraft electrical circuits. (Ref. AMM TASK 24-41-00-861-002)
(2) Pressurize the Blue hydraulic system with the electric pump. (Ref. AMM TASK 29-10-00-863-003)
(3) Put the rudder pedals in the neutral position.
(4) On the center pedestal, on the panel 110VU, make sure that the RUD TRIM indicator shows 0.
(5) Depressurize the Blue hydraulic system and put it in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
(6) Make sure that the Green and Yellow hydraulic systems are depressurized and put them in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
(7) On the overhead panel 23VU, release the FLT CTL/FAC 1 pushbutton switch. The OFF legend comes on.
(8) On the overhead panel 24VU, release the FLT CTL/FAC 2 pushbutton switch. The OFF legend comes on.
(9) Put the WARNING NOTICE(S) in the cockpit to tell persons not to operate the flight controls.
(10) De-energize the aircraft electrical circuits. (Ref. AMM TASK 24-41-00-862-002)
(11) Put the WARNING NOTICE(S) in position to tell persons not to operate the 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.

(12) Put the 98D27207545000 PIN-RIGGING (20) in the bellcrank assembly (2) of the travel limitation unit (3).

Subtask 27-21-48-865-050-A

D. Open, safety and tag 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

4. Procedure
Subtask 27-21-48-020-050-A

A. Removal of the Centering Rod
(1) Disconnect the centering rod (1) from the attachment bracket.
(a) Remove and discard the cotter pin (4).
(b) Remove the nut (5), the washer (6) and the bolt (10).
(2) Disconnect the centering rod (1) from the bellcrank assembly (2).
(a) Remove and discard the cotter pin (11).
(b) Hold the centering rod (1) in position.
(c) Remove the nut (12), the washer (13) and the bolt (17).
(3) Remove the centering rod (1).
(a) Move the fork-end of the centering rod (1) clear of the attachment bracket.
(b) Move the eye-end of the centering rod (1) clear of the lever arm at the bellcrank assembly (2).
(4) Temporarily safety the sliding bush (7) in the flanged bush (8) at the fork-end of the centering rod (1) with lockwire corrosion-resistant steel 0.8 mm (0.032 in.).
(5) Temporarily safety the sliding bush (14) in the flanged bush (15) at the lever arm of the bellcrank assembly (2) with lockwire corrosion-resistant steel 0.8 mm (0.032 in.).

NOTE: The flanged bushes (8),(9),(15),(16) are safetied in the lever arm and the fork-end with loctite.

[Rev.10 from 2021] 2026.03.31 23:48:36 UTC