Adjustment of the Rudder Neutral Position

TASK 27-24-00-820-001-A-01
Adjustment of the Rudder Neutral Position

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

CAUTION: DO THIS PROCEDURE IN A HANGAR IF THERE ARE WIND GUSTS. WIND GUSTS CAN CAUSE DAMAGE TO THE LINKAGE WHEN THE RIGGING PINS ARE IN POSITION ON THE RUDDER CONTROL.

ZONE: 320

1. Reason for the Job
There are alternative methods for this procedure. This task gives the method to adjust the neutral position of the rudder with the laser tool.

NOTE: This task can contribute to fuel savings.

NOTE: Two persons are necessary to do this task.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	1	ACCESS PLATFORM 8M (26 FT) - ADJUSTABLE
No specific	1	RULER - GRADUATED
No specific	AR	SAFETY BARRIER(S)
No specific	1	WARNING NOTICE(S)
98D27207516000	1	PIN-RIGGING,SET
OR	OR
98D27207546000	1	PIN-RIGGING
98D27303000001	2	LOAD,APPLICATION TOOL-ELEVATOR, AILERON, RUDDER
TR103-60	1	VTP-RUDDER ZERO DEGREE TOOL A320

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.05RDA1)	Adhesive Film Tape-Masking - -
(Material No.08BBD1)	Non Aqueous Cleaner-- Isopropyl Alcohol -
(Material No.14SBA1)	Textile-Lint free Cotton -
No specific	lockwire - corrosion resistant steel dia. 0.8 mm (0.03 in.)

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
320	VERTICAL STABILIZER AND RUDDER
325BL, 325CL, 325CR, 325DL, 822

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
6	REF	AIPC 11-21-27-02-010

E. Referenced Information

REFERENCE	DESIGNATION
TASK 11-00-00-960-001-A	Replacement of the Tail Cone Reference Triangle
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 27-21-00-820-003-A	Adjustment of the Rudder Mechanical Control
TASK 27-24-00-710-001-A	Operational Test of the Rudder Hydraulic Actuation
TASK 27-25-00-820-001-A	Adjustment of the Rudder Position Indicating
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 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
TASK 29-23-00-863-001-A	Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
TASK 29-23-00-864-001-A	Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU
TASK 29-24-00-863-001-A	Pressurize the Yellow Hydraulic System with the Electric Pump
TASK 29-24-00-864-001-A	Depressurize the Yellow Hydraulic System
TASK 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
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
Adjustment of the Rudder
Zero Degree Tool

3. Job Set-up
Subtask 27-24-00-860-096-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Pressurize the aircraft hydraulic systems
(Ref. AMM TASK 29-23-00-863-001) (Ref. AMM TASK 29-24-00-863-001) (Ref. AMM TASK 29-10-00-863-003).
(3) On the overhead panel, on FLT CTL panel 23VU, make sure that the FAC1, ELAC1 and SEC1 pushbutton switches are pushed (the OFF legends are off).
(4) On the overhead panel, on FLT CTL panel 24VU, make sure that the FAC2, ELAC2, SEC2 and SEC3 pushbutton switches are pushed (the OFF legends are off).
(5) On the center pedestal, on RUD TRIM/PARKING BRK panel 110VU, make sure that the RUD TRIM indicator shows 0.
(a) If the RUD TRIM indicator does not show 0, push the RESET pushbutton switch to move the rudder to the zero position.
(6) Depressurize the aircraft hydraulic systems
(Ref. AMM TASK 29-23-00-864-001) (Ref. AMM TASK 29-24-00-864-001) (Ref. AMM TASK 29-10-00-864-003).

Subtask 27-24-00-941-059-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) In the cockpit, put the WARNING NOTICE(S) in position to tell persons not to operate the flight controls.
(3) On the overhead panel, on the hydraulic section of panel 40VU, put the WARNING NOTICE(S) in position to tell persons not to pressurize the hydraulic systems.
(4) On the overhead panel, on FLT CTL panels 23VU and 24VU, put the WARNING NOTICE(S) in position to tell persons not to push the SEC, ELAC and FAC pushbutton switches.

Subtask 27-24-00-010-073-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at access door 822.
(2) Open access door 822 (Ref. AMM TASK 52-41-00-010-002).
(3) Open the access panel of battery power center 105VU.

Subtask 27-24-00-865-057-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B11
49VU	FLIGHT CONTROLS/SEC1/NORM/SPLY	21CE1	B08
49VU	AUTO FLT/FAC1/28VDC	5CC1	B04
49VU	AUTO FLT/FAC1/26VAC	14CC1	B03
105VU	FLIGHT CONTROLS/ELAC2/STBY SPLY	16CE2	A02
105VU	FLT CTL/ELAC1/STBY SPLY	16CE1	A01
121VU	AUTO FLT/RUDDER/TRIM/IND	15CC	M20
121VU	AUTO FLT/FAC2/28VDC	5CC2	M19
121VU	AUTO FLT/FAC2/26VAC	14CC2	M18
121VU	FLIGHT CONTROLS/SEC3/SPLY	21CE3	Q19
121VU	FLIGHT CONTROLS/SEC2/SPLY	21CE2	Q18
121VU	FLIGHT CONTROLS/ELAC2/NORM/SPLY	15CE2	R20

Subtask 27-24-00-010-074-C ** ON A/C NOT FOR ALL

E. Get Access
(1) Put the ACCESS PLATFORM 8M (26 FT) - ADJUSTABLE in position at zone 325.
(2) Open access panels 325CL, 325CR and 325DL (Ref. AMM TASK 55-33-13-010-002).

Subtask 27-24-00-860-104-A ** ON A/C NOT FOR ALL

F. Aircraft Maintenance Configuration

Adjustment of the Rudder ** ON A/C NOT FOR ALL

(1) Install the 98D27207546000 PIN-RIGGING98D27207516000 PIN-RIGGING,SET (7) in the output bellcrank of the lower servocontrol (1025GM) (4).
(a) If you cannot put the rigging pin in position easily, do the adjustment of the rudder mechanical control (Ref. AMM TASK 27-21-00-820-003).
(2) Install the pointer of the 98D27303000001 LOAD,APPLICATION TOOL-ELEVATOR, AILERON, RUDDER (5) on the trailing edge of the rudder.
(3) Pressurize the aircraft hydraulic systems
(Ref. AMM TASK 29-23-00-863-001) (Ref. AMM TASK 29-24-00-863-001) (Ref. AMM TASK 29-10-00-863-003).

4. Procedure
Subtask 27-24-00-420-054-A ** ON A/C NOT FOR ALL

A. Installation of the Reference Triangle for the Rudder Neutral Position

NOTE: If the reference triangle on the tail cone structure is not in position, this installation is not necessary.

NOTE: If the initial adjustment of two or three servocontrols did not change, you can find the rudder neutral position without the TR103-60 VTP-RUDDER ZERO DEGREE TOOL A320.

(1) If two or three servocontrols are not adjusted correctly, use the TR103-60 VTP-RUDDER ZERO DEGREE TOOL A320 to find the rudder neutral position.
(2) Find the rudder neutral position with two correctly adjusted servocontrols.
(a) Pressurize one of the two correctly adjusted servocontrols.
1 On maintenance panel 50VU:
Make sure that the applicable HYD/LEAK MEASUREMENT VALVES pushbutton switch is pushed (the OFF legend is off):

For the lower servocontrol (1025GM) (4): G pushbutton switch
For the middle servocontrol (3025GM) (3): Y pushbutton switch
For the upper servocontrol (2025GM) (2): B pushbutton switch.

2 Release the other two HYD/LEAK MEASUREMENT VALVES pushbutton switches (the OFF legends come on).
(b) On the tail cone structure, make a mark to show the rudder trailing-edge axis that the 98D27303000001 LOAD,APPLICATION TOOL-ELEVATOR, AILERON, RUDDER (5) gives.
(c) Pressurize the other correctly adjusted servocontrol and depressurize the first one:
1 On maintenance panel 50VU:
Push the applicable HYD/LEAK MEASUREMENT VALVES pushbutton switch (the OFF legend goes off):

For the lower servocontrol (1025GM) (4): G pushbutton switch
For the middle servocontrol (3025GM) (3): Y pushbutton switch
For the upper servocontrol (2025GM) (2): B pushbutton switch.

2 Release the other HYD/LEAK MEASUREMENT VALVES pushbutton switch (the OFF legend comes on).
(d) On the tail cone structure, make a mark to show the rudder trailing-edge axis that the 98D27303000001 LOAD,APPLICATION TOOL-ELEVATOR, AILERON, RUDDER (5) gives.
1 If the rudder neutral position is the same for the two servocontrols, it is not necessary to install the TR103-60 VTP-RUDDER ZERO DEGREE TOOL A320.
a Install the new AIPC 11-21-27-02-010 REF (6) on the tail cone with its center of gravity aligned with the rudder trailing-edge axis that the 98D27303000001 LOAD,APPLICATION TOOL-ELEVATOR, AILERON, RUDDER (5) gives (Ref. AMM TASK 11-00-00-960-001), and go to paragraph B.
2 If the rudder neutral position is not the same for the two servocontrols, install the TR103-60 VTP-RUDDER ZERO DEGREE TOOL A320. Continue the procedure.
(3) Depressurize the aircraft hydraulic systems
(Ref. AMM TASK 29-23-00-864-001) (Ref. AMM TASK 29-24-00-864-001) (Ref. AMM TASK 29-10-00-864-003).
(4) Find the rudder neutral position with the TR103-60 VTP-RUDDER ZERO DEGREE TOOL A320 as follows:

WARNING: BE CAREFUL WHEN YOU USE THIS TOOL, BECAUSE IT CONTAINS CLASS 2 LASER EQUIPMENT.

DO NOT LOOK DIRECTLY INTO THE BEAM
DO NOT POINT THE BEAM AT OTHER PERSONS.

THE LASER CAN CAUSE INJURY IF YOU DO NOT OBEY THESE PRECAUTIONS.

(a) Install the TR103-60 VTP-RUDDER ZERO DEGREE TOOL A320 on the vertical stabilizer:
1 Use a Textile-Lint free Cotton - (Material No.14SBA1) made moist with the Non Aqueous Cleaner-- Isopropyl Alcohol - (Material No.08BBD1) to clean the control surface where you will install the different parts of the TR103-60 VTP-RUDDER ZERO DEGREE TOOL A320.
2 Install the breaking corner (11) of the tool on the hinge strap of the end box ceiling, on the trailing edge of the vertical stabilizer below rib 4. This area is below the top left corner of access panel 325BL, below the horizontal rivet line.
3 Attach the suction foot of the breaking corner (11) with the clamp.
4 Install the safety suction foot to safety the breaking corner (11).
5 Install the laser (10) of the tool on the lower hoisting point of the left side of the vertical stabilizer.
a Turn the screw only two or three turns. Do not fully tighten the screw.
6 Start the laser (10).
7 Turn the laser (10) on the hoisting point until the beam aligns with the target line on the breaking corner (11).
8 Attach the suction foot of the laser (10) with the clamp.
9 Apply the Adhesive Film Tape-Masking - - (Material No.05RDA1) on the vertical stabilizer between the laser (10) and the target line of the braking corner (11) to see the laser beam clearly.
10 Install the target plate (12) of the tool on the rudder trailing edge with the horizontal line at approximately 1.3 m (4.27 ft.) from the rudder trailing-edge bottom. The laser beam aligns with the horizontal line on the target plate (12).
(5) Manually move the rudder until the laser-beam center point is between the two adjacent lines of the vertical target centerline, on the target plate (12).

NOTE: At this time, the rudder is in the mechanical neutral position.

(6) Install the new AIPC 11-21-27-02-010 REF (6) on the tail cone with its center of gravity aligned with the rudder trailing-edge axis that the 98D27303000001 LOAD,APPLICATION TOOL-ELEVATOR, AILERON, RUDDER (5) gives (Ref. AMM TASK 11-00-00-960-001).
(7) Remove the TR103-60 VTP-RUDDER ZERO DEGREE TOOL A320 from the vertical stabilizer:
(a) Stop the laser (10) and remove it from the vertical stabilizer.
(b) Remove the breaking corner (11) from the vertical stabilizer.
(c) Remove the target plate (12) from the rudder trailing edge.

Subtask 27-24-00-820-054-A ** ON A/C NOT FOR ALL

B. Adjustment of the Rudder Neutral Position with the reference triangle
(1) Pressurize the Green hydraulic system
(Ref. AMM TASK 29-23-00-863-001).
(2) On the tail cone structure, use the RULER - GRADUATED to make sure that the rudder trailing edge is aligned to plus or minus 3 mm (0.12 in.) with the center of gravity of the reference triangle (6).
(a) If the position of the rudder trailing edge is not in the permitted limits, do the adjustment of the spring rod (1) of the servocontrol (1025GM) (4) as follows:

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

1 Cut and discard the lockwire from the nuts (8) of the spring rod (1).
2 Loosen the nuts (8).
3 Disengage the lockwashers (9).
4 Adjust the length of the spring rod (1) of the servocontrol (1025GM) (4) until the rudder trailing edge is aligned to plus or minus 3 mm (0.12 in.) with the center of gravity of the reference triangle (6).
5 Engage the lockwashers (9).
6 Tighten the nuts (8).
7 Make sure that the adjustment is correct after you tighten the nuts (8).

8 Safety the nuts (8) with the lockwire - corrosion resistant steel dia. 0.8 mm (0.03 in.).
(b) If the position of the rudder trailing edge is in the permitted limits, continue this procedure.
(3) Pressurize the Yellow hydraulic system
(Ref. AMM TASK 29-24-00-863-001).
(4) Depressurize the Green hydraulic system
(Ref. AMM TASK 29-23-00-864-001).
(5) On the tail cone structure, use the RULER - GRADUATED to make sure that the rudder trailing edge is aligned to plus or minus 3 mm (0.12 in.) with the center of gravity of the reference triangle (6).
(a) If the position of the rudder trailing edge is not in the permitted limits, do the adjustment of the spring rod (1) of the servocontrol (3025GM) (3) as follows:

1 Cut and discard the lockwire from the nuts (8) of the spring rod (1).
2 Loosen the nuts (8).
3 Disengage the lockwashers (9).
4 Adjust the length of the spring rod (1) of the servocontrol (3025GM) (3) until the rudder trailing edge is aligned to plus or minus 3 mm (0.12 in.) with the center of gravity of the reference triangle (6).
5 To adjust the clearance, turn the spring rod (1) of the servocontrol (3025GM) (3) in the same direction as the spring rod of the servocontrol (1025GM) (4).
6 Engage the lockwashers (9).
7 Tighten the nuts (8).
8 Make sure that the adjustment is correct after you tighten the nuts (8).

9 Safety the nuts (8) with the lockwire - corrosion resistant steel dia. 0.8 mm (0.03 in.).
(b) If the position of the rudder trailing edge is in the permitted limits, continue this procedure.
(6) Pressurize the Blue hydraulic system
(Ref. AMM TASK 29-10-00-863-003).
(7) Depressurize the Yellow hydraulic system
(Ref. AMM TASK 29-24-00-864-001).
(8) On the tail cone structure, use the RULER - GRADUATED to make sure that the rudder trailing edge is aligned to plus or minus 3 mm (0.12 in.) with the center of gravity of the reference triangle (6).
(a) If the position of the rudder trailing edge is not in the permitted limits, do the adjustment of the spring rod (1) of the servocontrol (2025GM) (2) as follows:

1 Cut and discard the lockwire from the nuts (8) of the spring rod (1).
2 Loosen the nuts (8).
3 Disengage the lockwashers (9).
4 Adjust the length of the spring rod (1) of the servocontrol (2025GM) (2) until the rudder trailing edge is aligned to plus or minus 3 mm (0.12 in.) with the center of gravity of the reference triangle (6).
5 To adjust the clearance, turn the spring rod (1) of the servocontrol (2025GM) (2) in the same direction as the spring rod of the servocontrol (3025GM) (3).
6 Engage the lockwashers (9).
7 Tighten the nuts (8).
8 Make sure that the adjustment is correct after you tighten the nuts (8).

9 Safety the nuts (8) with the lockwire - corrosion resistant steel dia. 0.8 mm (0.03 in.).
(b) If the position of the rudder trailing edge is in the permitted limits, continue this procedure.
(9) Pressurize the Yellow hydraulic system
(Ref. AMM TASK 29-24-00-863-001).
(10) Pressurize the Green hydraulic system
(Ref. AMM TASK 29-23-00-863-001).
(11) On the tail cone structure, make sure that the rudder trailing edge is aligned with the center of gravity of the reference triangle (6) or in the limits.
(a) If the rudder trailing edge is not aligned with the center of gravity of the reference triangle (6) or in the limits, do the adjustment of the spring rod (1) of the three servocontrols (2), (3) and (4) again.
(12) Make sure that you can engage and disengage the rigging pin in and from the rudder position transducer-unit freely.
(a) If you cannot engage the rigging pin freely, do the adjustment of the rudder position indicating (Ref. AMM TASK 27-25-00-820-001).

5. Close-up
Subtask 27-24-00-860-105-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration

Adjustment of the Rudder ** ON A/C NOT FOR ALL

(1) Depressurize the aircraft hydraulic systems
(Ref. AMM TASK 29-23-00-864-001) (Ref. AMM TASK 29-24-00-864-001) (Ref. AMM TASK 29-10-00-864-003).
(2) Remove the pointer of the 98D27303000001 LOAD,APPLICATION TOOL-ELEVATOR, AILERON, RUDDER (5) from the trailing edge of the rudder.
(3) Remove the 98D27207546000 PIN-RIGGING98D27207516000 PIN-RIGGING,SET (7) from the output bellcrank of the lower servocontrol (1025GM) (4).

Subtask 27-24-00-410-065-C ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close access panels 325CL, 325CR and 325DL (Ref. AMM TASK 55-33-13-410-002).
(3) Close the access panel of battery power center 105VU.
(4) Close access door 822 (Ref. AMM TASK 52-41-00-410-002).
(5) Remove the access platform(s).

Subtask 27-24-00-710-063-A ** ON A/C NOT FOR ALL

C. Operational Test
(1) Do the operational test of the rudder control mechanism (Ref. AMM TASK 27-24-00-710-001).

Subtask 27-24-00-860-097-A ** ON A/C NOT FOR ALL

D. Put the aircraft back to its initial configuration.
(1) Remove the safety barriers.
(2) Remove the WARNING NOTICE(S).
(3) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-23-00-864-001) (Ref. AMM TASK 29-24-00-864-001) (Ref. AMM TASK 29-10-00-864-003).
(4) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:49:19 UTC