W DOC AIRBUS | AMM A320F

Check of the Actuating Spring Rod

TASK 27-21-49-200-001-A
Check of the Actuating Spring Rod

WARNING: YOU MUST PUT ON AND ATTACH A SAFETY HARNESS BEFORE YOU START WORK:
  • ON THE THS OR IN THE REAR FUSELAGE
  • ON TOP OF THE WINGS OR PYLONS.
WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.
ZONE: 325
1. Reason for the Job
Refer to the MPD TASK: 272100-10
FUNCTIONAL CHECK OF RUDDER SERVOCONTROL ACTUATING SPRING RODS
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
1
CALIPER
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
No specific
1
TIE WRAP
No specific
1
WARNING NOTICE(S)
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
325
VERTICAL STABILIZER TRAILING EDGE
325BR, 325CR
 C. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
9
COTTER PIN
AIPC 27-21-04-08-050
13
COTTER PIN
AIPC 27-21-04-22-100
9
COTTER PIN
AIPC 27-21-84-11-010
13
COTTER-PIN
AIPC 27-21-84-12-010
 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 27-21-49-000-001-A
Removal of the Spring Rod
TASK 27-21-49-400-001-A
Installation of the Spring Rod
TASK 27-24-00-710-002-A
Operational Test of the Rudder Servocontrols with Individual Hydraulic System
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 29-10-00-864-003-A
Depressurize the Blue Hydraulic System
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
F Spring Rod
3. Job Set-up
Subtask 27-21-49-865-054-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUAUTO FLT/FAC1/28VDC5CC1B04
49VUAUTO FLT/FAC1/26VAC14CC1B03
** ON A/C NOT FOR ALL
49VUAUTO FLT/FAC1/28VDC5CC1H10
49VUAUTO FLT/FAC1/26VAC14CC1H09
** ON A/C ALL
121VUAUTO FLT/RUDDER/TRIM/IND15CCM20
121VUAUTO FLT/FAC2/28VDC5CC2M19
121VUAUTO FLT/FAC2/26VAC14CC2M18
Subtask 27-21-49-860-056-A
B. 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
(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 zero.
   (5) On the overhead panel 23VU, release the FLT CTL/FAC 1 pushbutton switch. Make sure that the OFF legend comes on.
   (6) On the overhead panel 24VU, release the FLT CTL/FAC 2 pushbutton switch. Make sure that the OFF legend comes on.
   (7) Depressurize the Blue hydraulic system
(Ref. AMM TASK 29-10-00-864-003).
Subtask 27-21-49-865-055-A
C. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUAUTO FLT/FAC1/28VDC5CC1B04
49VUAUTO FLT/FAC1/26VAC14CC1B03
** ON A/C NOT FOR ALL
49VUAUTO FLT/FAC1/28VDC5CC1H10
49VUAUTO FLT/FAC1/26VAC14CC1H09
** ON A/C ALL
121VUAUTO FLT/RUDDER/TRIM/IND15CCM20
121VUAUTO FLT/FAC2/28VDC5CC2M19
121VUAUTO FLT/FAC2/26VAC14CC2M18
Subtask 27-21-49-860-057-A
D. Aircraft Maintenance Configuration
   (1) Make sure that the hydraulic systems are depressurized and put them in the maintenance configuration
(Ref. AMM TASK 29-00-00-864-001).
   (2) Put the WARNING NOTICE(S) in position to tell persons not to operate:
  • The flight controls
  • The Green, the Yellow or the Blue hydraulic systems.
Subtask 27-21-49-010-051-B
E. Get Access
   (1) Put the ACCESS PLATFORM 10M (33 FT) - ADJUSTABLE in position at zone 325.
   (2) Open the access panel 325CR and remove the access panel 325BR (Ref. AMM TASK 55-33-13-010-002).
4. Procedure
Subtask 27-21-49-280-050-A
A. Measurement of the Control Rods
F Spring Rod
   (1) Disconnect the control rod (4):
     (a) Remove and discard the cotter pin (13).
     (b) Remove the nut (14), the washer (15), the bolt (11) and the bush (12).
CAUTION: WHEN YOU DISCONNECT THE SPRING RODS, MAKE SURE THAT THE BEND ANGLE OF THE BEARING OF THE EYE-ENDS IS NOT MORE THAN 8 DEG. IF THE BEND ANGLE IS MORE THAN 8 DEG., DAMAGE CAN OCCUR TO THE PROTECTION FLANGE OF THE BEARING OR TO THE BEARING ITSELF.
   (2) Check of the spring rod (3):
NOTE: The spring rod which is checked must remain connected. The other two spring rods must be disconnected during the check.
     (a) Disconnect the spring rods (1) and (2):
       1 Remove and discard the cotter pins (9).
       2 Remove the nuts (8), the washers (7), the bolts (5) and the distance bushes (6).
       3 Temporarily attach the spring rods (1) and (2) to the adjacent structure with a TIE WRAP.
     (b) Do a check of the spring rod (3):
NOTE: It is recommended that you use a CALIPER to measure the dimension "X".
       1 Measure the dimension "X" of the spring rod (3). Record this value as the value "X1".
       2 Push the control rod (4) until the spring rod (3) moves to its inner stop.
       3 Release the control rod (4).
       4 Measure the dimension "X" of the spring rod (3) again. Record this value as the value "X2".
       5 Pull the control rod (4) until the spring rod (3) moves to its inner stop.
       6 Release the control rod (4).
       7 Measure the dimension "X" of the spring rod (3) again. Record this value as the value "X3".
       8 Add the values "X1", "X2" and "X3" and divide by 3. Record the result as value "X4".
       9 If one or more of the measured values "X1", "X2" or "X3" is outside the calculated value of "X4", plus a tolerance of 0 -0.2 MM or +0.2 MM (0.0000 -0.0079 IN. or +0.0079 IN.):
     (c) Connect the spring rods (1) and (2):
       1 Remove the TIE WRAP from the structure and the spring rods (1) and (2).
       2 Put the rod ends of the spring rods (1) and (2) into the lever of the drive shaft (10).
       3 Install the distance bushes (6), the bolts (5), the washers (7) and the nuts (8).
       4 Tighten the nuts (8).
       5 Safety the nuts (8) with the new AIPC 27-21-04-08-050 COTTER PIN (9) or AIPC 27-21-84-11-010 COTTER PIN (9).
CAUTION: WHEN YOU DISCONNECT THE SPRING RODS, MAKE SURE THAT THE BEND ANGLE OF THE BEARING OF THE EYE-ENDS IS NOT MORE THAN 8 DEG. IF THE BEND ANGLE IS MORE THAN 8 DEG., DAMAGE CAN OCCUR TO THE PROTECTION FLANGE OF THE BEARING OR TO THE BEARING ITSELF.
   (3) Check of the spring rod (2):
NOTE: The spring rod which is checked must remain connected. The other two spring rods must be disconnected during the check.
     (a) Disconnect the spring rods (1) and (3):
       1 Remove and discard the cotter pins (9).
       2 Remove the nuts (8), the washers (7), the bolts (5) and the distance bushes (6).
       3 Temporarily attach the spring rods (1) and (3) to the adjacent structure with a TIE WRAP.
     (b) Do a check of the spring rod (2):
NOTE: It is recommended that you use a CALIPER to measure the dimension "X".
       1 Measure the dimension "X" of the spring rod (2). Record this value as the value "X1".
       2 Push the control rod (4) until the spring rod (2) moves to its inner stop.
       3 Release the control rod (4).
       4 Measure the dimension "X" of the spring rod (2) again. Record this value as the value "X2".
       5 Pull the control rod (4) until the spring rod (2) moves to its inner stop.
       6 Release the control rod (4).
       7 Measure the dimension "X" of the spring rod (2) again. Record this value as the value "X3".
       8 Add the values "X1", "X2" and "X3" and divide by 3. Record the result as value "X4".
       9 If one or more of the measured values "X1", "X2" or "X3" is outside the calculated value of "X4", plus a tolerance of 0 -0.2 MM or +0.2 MM (0.0000 -0.0079 IN. or +0.0079 IN.):
     (c) Connect the spring rods (1) and (3):
       1 Remove the TIE WRAP from the structure and the spring rods (1) and (3).
       2 Put the rod ends of the spring rods (1) and (3) into the lever of the drive shaft (10).
       3 Install the distance bushes (6), the bolts (5), the washers (7) and the nuts (8).
       4 Tighten the nuts (8).
       5 Safety the nuts (8) with the new AIPC 27-21-04-08-050 COTTER PIN (9) or AIPC 27-21-84-11-010 COTTER PIN (9).
CAUTION: WHEN YOU DISCONNECT THE SPRING RODS, MAKE SURE THAT THE BEND ANGLE OF THE BEARING OF THE EYE-ENDS IS NOT MORE THAN 8 DEG. IF THE BEND ANGLE IS MORE THAN 8 DEG., DAMAGE CAN OCCUR TO THE PROTECTION FLANGE OF THE BEARING OR TO THE BEARING ITSELF.
   (4) Check of the spring rod (1):
NOTE: The spring rod which is checked must remain connected. The other two spring rods must be disconnected during the check.
     (a) Disconnect the spring rods (2) and (3):
       1 Remove and discard the cotter pins (9).
       2 Remove the nuts (8), the washers (7), the bolts (5) and the distance bushes (6).
       3 Temporarily attach the spring rods (2) and (3) to the adjacent structure with a TIE WRAP.
     (b) Do a check of the spring rod (1):
NOTE: It is recommended that you use a CALIPER to measure the dimension "X".
       1 Measure the dimension "X" of the spring rod (1). Record this value as the value "X1".
       2 Push the control rod (4) until the spring rod (1) moves to its inner stop.
       3 Release the control rod (4).
       4 Measure the dimension "X" of the spring rod (1) again. Record this value as the value "X2".
       5 Pull the control rod (4) until the spring rod (1) moves to its inner stop.
       6 Release the control rod (4).
       7 Measure the dimension "X" of the spring rod (1) again. Record this value as the value "X3".
       8 Add the values "X1", "X2" and "X3" and divide by 3. Record the result as value "X4".
       9 If one or more of the measured values "X1", "X2" or "X3" is outside the calculated value of "X4", plus a tolerance of 0 -0.2 MM or +0.2 MM (0.0000 -0.0079 IN. or +0.0079 IN.):
     (c) Connect the spring rods (2) and (3):
       1 Remove the TIE WRAP from the structure and the spring rods (2) and (3).
       2 Put the rod ends of the spring rods (2) and (3) into the lever of the drive shaft (10).
       3 Install the distance bushes (6), the bolts (5), the washers (7) and the nuts (8).
       4 Tighten the nuts (8).
       5 Safety the nuts (8) with the new AIPC 27-21-04-08-050 COTTER PIN (9) or AIPC 27-21-84-11-010 COTTER PIN (9).
   (5) Installation of the control rod (4):
     (a) Put the rod (4) into the differential lever (16) of the rudder control unit.
     (b) Install the distance bush (12), the bolt (11), the washer (15), and the nut (14).
     (c) Tighten the nut (14).
     (d) Safety the nut (14) with the new AIPC 27-21-04-22-100 COTTER PIN (13) or AIPC 27-21-84-12-010 COTTER-PIN (13).
5. Close-up
Subtask 27-21-49-865-056-A
A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUAUTO FLT/FAC1/28VDC5CC1B04
49VUAUTO FLT/FAC1/26VAC14CC1B03
** ON A/C NOT FOR ALL
49VUAUTO FLT/FAC1/28VDC5CC1H10
49VUAUTO FLT/FAC1/26VAC14CC1H09
** ON A/C ALL
121VUAUTO FLT/RUDDER/TRIM/IND15CCM20
121VUAUTO FLT/FAC2/28VDC5CC2M19
121VUAUTO FLT/FAC2/26VAC14CC2M18
Subtask 27-21-49-710-051-A
B. Do the operational test of the rudder servo controls (Ref. AMM TASK 27-24-00-710-002).
Subtask 27-21-49-410-051-B
C. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Close the access panel 325CR and install the access panel 325BR (Ref. AMM TASK 55-33-13-410-002).
   (3) Remove the WARNING NOTICE(S).
   (4) Remove the access platform(s).
   (5) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
[Rev.10 from 2021] 2026.03.31 23:48:40 UTC
"Aviabrain" 2025