Adjustment of the Rudder Position Indicating

TASK 27-25-00-820-001-A
Adjustment of the Rudder Position Indicating

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.

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.

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
98D27207516000	1	PIN-RIGGING,SET
OR	OR
98D27207546000	1	PIN-RIGGING

B. Consumable Materials

REFERENCE	DESIGNATION
No specific	lockwire corrosion resistant steel dia 0.8 mm (0.03 in.)

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
325	VERTICAL STABILIZER TRAILING EDGE
325BL, 325BR, 325CL, 325CR

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 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 27-24-00-820-001-A	Adjustment of the Rudder Neutral Position
TASK 27-24-00-820-001-A-01	Adjustment of the Rudder Neutral Position
TASK 27-24-00-820-001-B	Adjustment of the Rudder Neutral Position
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
Tolerance Range for the Rudder Surface at the Zero Position
Rigging - Location

3. Job Set-up
Subtask 27-25-00-010-050-A

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

Subtask 27-25-00-865-050-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 27-25-00-860-051-A

C. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) On the overhead panel 23VU, make sure that the FLT CTL/FAC1 pushbutton switch is pushed (on this pushbutton switch, the OFF and FAULT legends are off).
(3) On the overhead panel 24VU, make sure that the FLT CTL/FAC2 pushbutton switch is pushed (on this pushbutton switch, the OFF and FAULT legends are off).
(4) On the center pedestal, on the panel 110VU, make sure that the RUD TRIM indicator shows O.
(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) On the tail cone, make sure that the lower part of the rudder trailing edge is aligned at 0 +3 mm or -3 mm (0.0000 +0.1181 in. or -0.1181 in.) with the center of gravity of the reference triangle. If it is not the case, do the adjustment of the rudder neutral position with the reference triangle (Ref. AMM TASK 27-24-00-820-001).

Tolerance Range for the Rudder Surface at the Zero Position

(7) Install the 98D27207546000 PIN-RIGGING98D27207516000 PIN-RIGGING,SET (1) on the output bellcrank of the lower servocontrol (2).

Rigging - Location

(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).

4. Procedure
Subtask 27-25-00-820-050-A

A. Adjustment of the Rudder Position Indication

CAUTION: BE CAREFUL WHEN YOU USE THE RIGGING PIN ON THE TRANSDUCER UNIT. DO NOT USE FORCE TO ENGAGE THE RIGGING PIN IN THE TRANSDUCER UNIT. IF YOU USE FORCE, THE RIGGING PIN WILL NOT DISENGAGE FREELY AND DAMAGE TO THE TRANSDUCER UNIT CAN OCCUR.

(1) Push the pin (4) of the transducer unit (5).

NOTE: The pin (4) is part of the transducer unit (5).

You must push the pin (4) freely. If this is not the case, adjust the length of the rod (3) as follows :
(a) Cut and remove the lockwire from the nuts.
(b) Loosen the nuts.
(c) Release the lockwashers.
(d) Adjust the length of the rod (3) until you can push the pin (4) freely.
(e) Engage the lockwashers.
(f) Tighten the nuts.
(g) Make sure that the adjustment is correct after you have tightened the nuts.
(h) Safety the nuts with lockwire corrosion resistant steel dia 0.8 mm (0.03 in.).
(i) Remove the 98D27207546000 PIN-RIGGING98D27207516000 PIN-RIGGING,SET (1) from the output bellcrank of the lower servocontrol (2).

Rigging - Location

(j) Make sure that the pin (4) is disengaged from the input lever of the transducer unit (5).

Subtask 27-25-00-710-050-A

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

5. Close-up
Subtask 27-25-00-860-050-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) Make sure that the work area is clean and clear of tools and other items.
(3) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 27-25-00-410-050-A

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

[Rev.10 from 2021] 2026.03.31 23:49:35 UTC