Operational Test of the Centering Spring Rod

TASK 27-21-00-710-001-A
Operational Test of the Centering Spring Rod

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: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

ZONE: 210
ZONE: 325

1. Reason for the Job
Refer to the MPD TASK: 272100-05
OPERATIONAL CHECK OF CENTERING SPRING ROD
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 10M (33 FT) - ADJUSTABLE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
325	VERTICAL STABILIZER TRAILING EDGE
325BL, 325BR

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
6	COTTER PIN	AIPC 27-21-04-22-100
6	COTTER PIN	AIPC 27-21-84-12-010

D. Referenced Information

REFERENCE	DESIGNATION
TASK 22-61-00-710-001-A	Operational Test of the Rudder-Travel Limiting Function
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 29-10-00-863-003-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 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
Disconnection of the Rod at the Differential Output Bellcrank

3. Job Set-up
Subtask 27-21-00-710-056-A

A. Do the operational test of the rudder travel limiting function (Ref. AMM TASK 22-61-00-710-001).

Subtask 27-21-00-010-050-A

B. Get Access
(1) Put an ACCESS PLATFORM 10M (33 FT) - ADJUSTABLE in position at zone 325.
(2) Open the access doors 325BL 325BR.

Subtask 27-21-00-860-061-A

C. Aircraft Maintenance Configuration
(1) Disconnect the input rod (1) from the differential output bellcrank

Disconnection of the Rod at the Differential Output Bellcrank

(Ref. Detail B).
(a) Remove and discard the cotter pin (6).
(b) Remove the nut (5) and the washer (4).
(c) Remove the screw (2) and disconnect the rod (1).
(2) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(3) On the overhead panel 23VU, make sure that the FLT CTL/FAC1 pushbutton switch is pushed (on this pushbutton switch, the FAULT and OFF legends are off).
(4) On the overhead panel 24VU, make sure that the FLT CTL/FAC2 pushbutton switch is pushed (on this pushbutton switch, the FAULT and OFF legends are off).
(5) 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).
(6) Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).
(7) On the center pedestal, on the ECAM control panel, push the F/CTL key (on the lower ECAM display unit, the F/CTL page comes into view).
(8) On the center pedestal, on the panel 110VU, make sure that the RUD TRIM indicator shows 0.
(9) On the upper ECAM display unit, make sure that there is no warning related to the AUTO FLT RUD TRV LIM systems.

Subtask 27-21-00-865-050-A

D. 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/FAC2/28VDC	5CC2	M19
121VU	AUTO FLT/FAC2/26VAC	14CC2	M18

4. Procedure
Subtask 27-21-00-710-050-A

A. Do this test:

ACTION	RESULT
1.Pull hard on the input rod down until you come to the mechanical stop. Hold it in this position (so that it cannot suddenly move back to its initial position).	The rudder moves to the right. On the lower ECAM DU, on the F/CTL page: The RUD pointer moves to the right mark.
2.Slowly release the rod to allow for the force set up in the centering rod.	The rudder slowly returns to zero.
	On the lower ECAM DU, on the F/CTL page: The RUD pointer slowly returns to zero.
3.Push on the input rod up until you come to the mechanical stop. Hold it in this position (so that it cannot suddenly move back to its initial position).	The rudder moves to the left.
	On the lower ECAM DU, on the F/CTL page: The RUD pointer moves to the left mark.
4.Slowly release the rod to allow for the force set up in the centering rod.	The rudder slowly returns to zero.
	On the lower ECAM DU, on the F/CTL page: The RUD pointer slowly returns to zero.

5. Close-up
Subtask 27-21-00-860-062-A

A. Put the aircraft back to its initial configuration.
(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) Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).
(3) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
(4) Connect the input rod (1) to the differential output bellcrank

Disconnection of the Rod at the Differential Output Bellcrank

(Ref. Detail B).
(a) Connect the rod (1) at the bellcrank (3) and install the screw (2).
(b) Install the washer (4), the nut (5) and the new AIPC 27-21-04-22-100 COTTER PIN (6) or AIPC 27-21-84-12-010 COTTER PIN (6).
(5) Make sure that the work area is clean and clear of tools and other items.

Subtask 27-21-00-410-050-A

B. Close Access
(1) Close the access doors 325BR 325BL.
(2) Remove the access platform(s).

[Rev.10 from 2021] 2026.03.31 23:47:50 UTC