DOC AIRBUS | AMM A320FInstallation of STA-LOK Nuts and Lockwashers
TASK 20-22-00-400-001-A
Installation of STA-LOK Nuts and Lockwashers
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Referenced Information
3. Job Set-up
Subtask 20-22-00-941-052-A
Subtask 20-22-00-911-051-A
[Rev.10 from 2021]
2026.04.01 06:48:31 UTC
Installation of STA-LOK Nuts and Lockwashers
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 | WRENCH - STANDARD |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.03HBD9) | Synthetic Ester base Grease-General Purpose Low Temp - |
| (Material No.08BAA9) | Non Aqueous Cleaner-General - - |
| REFERENCE | DESIGNATION |
|---|---|
STA-LOK Nuts NSA5454Subtask 20-22-00-941-052-A
A. Not Applicable
4. ProcedureSubtask 20-22-00-911-051-A
A. Installation of STA-LOK Nuts and Lockwashers
(1) Make sure that the grip length of the pin/bolt is more than the minimum.
(2) Use the tool wrenches-notched, tightening of nuts STA-LOK NSA5454 (SL90-315) (Ref. Table 2) and the tool-installation, tab washers STA-LOK NSA5454 (SL90-313) (Ref. Table 3).
(3) Define the torque value for the nut (1) (Ref. Table 2).
(5) Examine the nut (1), the pin/bolt (2) and the lockwasher (3). Make sure that they are in good condition.
(6) Apply the Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) on the threads of the pin (2) to make the installation of the nut (1) easier.
(7) Install the nut (1) on the pin/bolt (2). Install the tool wrenches-notched, tightening of nuts STA-LOK NSA5454 (SL90-315) on the nut.
(9) Install the lockwasher (3) on the threads of the pin/bolt (2). Make sure that the tangs (4) of the lockwasher (3) align with the slots of the nut (1).
(10) Adjust the tool-installation, tab washers STA-LOK NSA5454 (SL90-313) so that the inner face of the tool (8) core aligns with the outer face of the tool (9) body.
(13) Engage the circlip (6) of the lockwasher (3) in the groove (7) of the nut (1).
To do this, hold the body of the tool with one hand to stop its rotation. Turn the tool core with the wrench.
(15) Remove the tool.
(1) Make sure that the grip length of the pin/bolt is more than the minimum.
(2) Use the tool wrenches-notched, tightening of nuts STA-LOK NSA5454 (SL90-315) (Ref. Table 2) and the tool-installation, tab washers STA-LOK NSA5454 (SL90-313) (Ref. Table 3).
(3) Define the torque value for the nut (1) (Ref. Table 2).
NOTE: The table 2 gives the standard torque values. Obey the special torque values given in the maintenance tasks.
(4) Clean the pin/bolt with Non Aqueous Cleaner-General - - (Material No.08BAA9) . (5) Examine the nut (1), the pin/bolt (2) and the lockwasher (3). Make sure that they are in good condition.
(6) Apply the Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) on the threads of the pin (2) to make the installation of the nut (1) easier.
(7) Install the nut (1) on the pin/bolt (2). Install the tool wrenches-notched, tightening of nuts STA-LOK NSA5454 (SL90-315) on the nut.
NOTE: For STA-LOK NSA 5454-5DRH no special tool is necessary to tighten the nut.
(8) Use the WRENCH - STANDARD to TORQUE the nut (1) to the correct value. (9) Install the lockwasher (3) on the threads of the pin/bolt (2). Make sure that the tangs (4) of the lockwasher (3) align with the slots of the nut (1).
(10) Adjust the tool-installation, tab washers STA-LOK NSA5454 (SL90-313) so that the inner face of the tool (8) core aligns with the outer face of the tool (9) body.
NOTE: For the nut STA-LOK SL40290, there is no special tool.
(11) Engage the 2 lugs of the tool through the slots (5) of the nut (1). NOTE: If there is not sufficient space at the end of the pin/bolt, use the special tool-installation, tab washers STA-LOK NSA5454 (SL90-309).
(Ref. Table 4)
Turn the tool core clockwise. Install the tool on the pin/bolt (2). Turn the tool core counterclockwise until the lugs fit into the available slots (5) of the nut (1).
(12) Turn the body of the tool counterclockwise ( 45 deg (45.0000 deg) approximately). (Ref. Table 4)
Turn the tool core clockwise. Install the tool on the pin/bolt (2). Turn the tool core counterclockwise until the lugs fit into the available slots (5) of the nut (1).
(13) Engage the circlip (6) of the lockwasher (3) in the groove (7) of the nut (1).
To do this, hold the body of the tool with one hand to stop its rotation. Turn the tool core with the wrench.
NOTE: You must hear a click when the circlip engages fully in the groove (7).
(14) Loosen the tool core. Turn the tool body clockwise until the tangs (4) of the lockwasher (3) align with the slots (5) of the nut (1). (15) Remove the tool.