Adjustment of the Forward Eccentrics (Tracks 3 and 4)

TASK 27-51-00-820-004-A
Adjustment of the Forward Eccentrics (Tracks 3 and 4)

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.

CAUTION: BE CAREFUL WHEN YOU DO MAINTENANCE TASKS ON THE WING TRAILING EDGE:

DO NOT CAUSE DAMAGE TO THE ELECTRICAL CABLE RACEWAYS.
DO NOT CAUSE DAMAGE TO THE ELECTRICAL CABLE INSTALLATIONS.
MAKE SURE THAT THE ELECTRICAL CABLES ARE INSTALLED CORRECTLY. INCORRECT INSTALLATION CAN CAUSE DAMAGE.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)
98D27508655000	1	RIG-SCALE,FLAP
98D27803500001	1	LOCKING TOOL ZERO POS
OR	OR
98D27803500002	1	LOCKING TOOL ZERO POS

B. Referenced Information

REFERENCE	DESIGNATION
TASK 27-50-00-866-009-A	Retraction of the Flaps on the Ground
TASK 27-50-00-866-009-A-01	Retraction of the Flaps/Slats on the Ground
TASK 27-51-00-820-008-A	Adjustment (Rigging) of the Flaps with the Sharks Fin Tool (A318/319/320)
TASK 27-51-00-820-009-A	Adjustment (Rigging) of the Flaps with the Sharks Fin Tool (A321)
Forward Eccentrics - Location and Detail
Label Positions - Flap Tracks 2, 3 and 4 ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 27-51-00-941-067-A

A. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Put a WARNING NOTICE(S) on panel 114VU to tell persons not to operate the flap/slat controls.

Subtask 27-51-00-860-060-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) You can do this adjustment with the aircraft on jacks or with the aircraft weight on the landing gear.
(2) Make sure that the flaps are fully retracted (Ref. AMM TASK 27-50-00-866-009).
(3) Install the 98D27803500001 LOCKING TOOL ZERO POS98D27803500002 LOCKING TOOL ZERO POS on the flap/slat control lever.

Subtask 27-51-00-860-060-B ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Make sure that the aircraft weight is on the landing gear when you do the flap rigged position procedure.
(2) Make sure that the flaps are fully retracted (Ref. AMM TASK 27-50-00-866-009).
(3) Install the 98D27803500001 LOCKING TOOL ZERO POS98D27803500002 LOCKING TOOL ZERO POS on the flap/slat control lever.

4. Procedure
Subtask 27-51-00-480-052-B ** ON A/C NOT FOR ALL

A. Preparation for Adjustment of the Forward Eccentrics
(1) At the track 3 and track 4 positions, install the sharks fin flap rigging kit (Ref. AMM TASK 27-51-00-820-008).

Subtask 27-51-00-480-052-C ** ON A/C NOT FOR ALL

A. Preparation for Adjustment of the Forward Eccentrics
(1) At the track 3 and track 4 positions, install the sharks fin flap rigging kit (Ref. AMM TASK 27-51-00-820-009).

Subtask 27-51-00-480-052-E ** ON A/C NOT FOR ALL

A. Preparation for Adjustment of the Forward Eccentrics
(1) At the track 3 and track 4 positions, install the sharks fin flap rigging kit (Ref. AMM TASK 27-51-00-820-008) and the 98D27508655000 RIG-SCALE,FLAP.

NOTE: Do not use the scale block from the rigging kit. Use the additional scale block (RIG-SCALE,FLAP (98D27508655000).

Subtask 27-51-00-820-053-C ** ON A/C NOT FOR ALL

B. Adjustment of the Forward Eccentrics

Forward Eccentrics - Location and Detail ** ON A/C NOT FOR ALL

(1) Remove and discard the cotter pin (5) from the nut (4).
(2) At the track 3 position, remove the nut (4), the washer (3), the bolt (1) and the serrated plate (2).
(3) At the track 4 position, remove the bolt (7), the washer (8) and the serrated plate (9).
(4) Adjust the forward eccentrics (6) and (10) in sequence. Make sure that the adjustments are in small equal increments, to move the flap deflection by the same distance.

NOTE: Read the values shown on the label as follows:

a plus (+) or (up) value shows that the flap trailing edge must be moved up
a minus (-) or (down) value shows that the flap trailing edge must be moved down.

(5) At the track 3 position, temporarily install the serrated plate (2) with the bolt (1), the washer (3) and the nut (4).
(6) At the track 4 position, temporarily install the serrated plate (9) with the bolt (7) and the washer (8).
(7) Make sure that the punched/painted marks on the forward eccentrics align.
(8) Remove the sharks fin flap rigging kit (Ref. AMM TASK 27-51-00-820-008) or (Ref. AMM D/O 27-51-00-82).

Subtask 27-51-00-820-053-D ** ON A/C NOT FOR ALL

B. Adjustment of the Forward Eccentrics

Forward Eccentrics - Location and Detail ** ON A/C NOT FOR ALL

(1) Before you adjust the forward eccentric bearings:

Make sure that the forward eccentrics are in the zero datum position.

NOTE: The forward eccentrics are in the zero datum position when the punched/painted marks on the forward eccentrics align.

(2) Read the asymmetrical offset value on the label which is attached to the track 3.

NOTE: Read the values shown on the label as follows:

a plus (+) or (up) value shows that the flap trailing edge must be moved up.
a minus (-) or (down) value shows that the flap trailing edge must be moved down.

(a) If there is no value shown on the label, do not adjust the forward eccentrics.
(3) Status of the main eccentric bearings:
(a) For A318/A319/A320:

NOTE: The main eccentric bearings were adjusted before with the value of label (43).
The value of label (43) is now your nominal value on the scale block.
The value of label (41) will be added to this nominal value.

(b) For A321 only:

NOTE: The main eccentric bearings were adjusted before to the zero line of the scale block.
The zero line of the scale block is your nominal value.
The value of label (100) will be added to this nominal value (zero).
Refer to the related figure in the task 'Adjustment (Rigging) of the Flaps with the Sharks Fin Tool (A321)' (Ref. AMM TASK 27-51-00-820-009).

(4) Adjustment of the forward eccentrics:
(a) Remove and discard the cotter pin (5) from the nut (4).
(b) At the track 3 position, remove the nut (4), the washer (3), the bolt (1) and the serrated plate (2).
(c) At the track 4 position, remove the bolt (7), the washer (8) and the serrated plate (9).
(d) Adjust the forward eccentrics (6) and (10) in sequence by the amount shown on the label attached to flap track 3.
1 Make sure that the adjustments are in small equal increments to move the flap deflection by the same amount.

NOTE: The scale block has 1 millimeter graduations.
Look inboard from the outside of the flap track beam when you read the scale block.

2 The adjusted values have a tolerance of +/- 1 mm (0.0394 in.).
(e) At track 3:
1 Temporarily install the serrated plate (2) with the bolt (1), the washer (3) and the nut (4).
2 For A318/A319/A320:
Do a check of the scale block to make sure that the top surface of the flap trailing edge is aligned with the added value of label (41).
3 For A321 only:
Do a check of the scale block to make sure that the top surface of the flap trailing edge is aligned with the value of label (100).
(f) At track 4:
1 Temporarily install the serrated plate (9) with the bolt (7) and the washer (8).
2 For A318/A319/A320:
Do a check of the scale block to make sure that the top surface of the flap trailing edge is aligned with the added value of label (41).
3 For A321 only:
Do a check of the scale block to make sure that the top surface of the flap trailing edge is aligned with the value of label (100).
(5) Go back to the related adjustment (rigging) task (Ref. AMM TASK 27-51-00-820-008) or (Ref. AMM TASK 27-51-00-820-009)
or remove the sharks fin tool and the scale block.

Subtask 27-51-00-820-053-E ** ON A/C NOT FOR ALL

B. Adjustment of the Forward Eccentrics

Label Positions - Flap Tracks 2, 3 and 4 ** ON A/C NOT FOR ALL

Forward Eccentrics - Location and Detail ** ON A/C NOT FOR ALL

(1) Before you adjust the forward eccentric bearings:

Make sure that the forward eccentrics are in the zero datum position.

NOTE: The forward eccentrics are in the zero datum position when the punched/painted marks on the forward eccentrics align.

(2) Read the asymmetrical offset value on the label (41) which is attached to the track 3.

NOTE: Read the values shown on the label as follows:

a plus (+) or (up) value shows that the flap trailing edge must be moved up
a minus (-) or (down) value shows that the flap trailing edge must be moved down.

(a) If there is no value shown on the label (41), do not adjust the forward eccentrics.
(3) Status of the main eccentric bearings:

(4) Adjustment of the forward eccentrics:
(a) Remove and discard the cotter pin (5) from the nut (4).
(b) At track 3, remove the nut (4), the washer (3), the bolt (1) and the serrated plate (2).
(c) At track 4, remove the bolt (7), the washer (8) and the serrated plate (9).
(d) Adjust the forward eccentrics (6) and (10) in sequence by the amount shown on the label (41).
1 Make sure that the adjustments are in small equal increments to move the flap deflection by the same amount.

NOTE: The scale block has 1 millimeter graduations.
Look inboard from the outside of the flap track beam when you read the scale block.

2 The adjusted values have a tolerance of +/- 1 mm (0.0394 in.).
(e) At track 3:
1 Temporarily install the serrated plate (2) with the bolt (1), the washer (3) and the nut (4).
2 Do a check of the scale block to make sure that the top surface of the flap trailing edge is aligned with the added value of label (41).
(f) At track 4:
1 Temporarily install the serrated plate (9) with the bolt (7) and the washer (8).
2 Do a check of the scale block to make sure that the top surface of the flap trailing edge is aligned with the added value of label (41).
(5) Go back to the adjustment (rigging) task (Ref. AMM TASK 27-51-00-820-008) or remove the sharks fin tool and the scale block 98D27508655000 RIG-SCALE,FLAP.

5. Close-up
Subtask 27-51-00-942-068-A

A. Removal of Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the safety barriers.
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 06:57:39 UTC