DOC AIRBUS | AMM A320FInstallation of Cupwashers [IAE]
TASK 70-40-11-911-011-A
Installation of Cupwashers
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Consumable Materials
B. Referenced Information
3. Job Set-up
Subtask 70-40-11-869-052-A ** ON A/C NOT FOR ALL
Subtask 70-40-11-911-051-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:19:46 UTC
Installation of Cupwashers
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Consumable Materials
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.V02-081) | metal marking crayon |
| REFERENCE | DESIGNATION |
|---|---|
Crimping Cup Type KeywashersSubtask 70-40-11-869-052-A ** ON A/C NOT FOR ALL
A. Not Applicable
4. ProcedureSubtask 70-40-11-911-051-A ** ON A/C NOT FOR ALL
A. Installation of Cupwashers
(1) Cup type keywashers must be used one time only. A new cup type keywasher must be used at each assembly.
(2) The outside diameter (OD) of a cup type keywasher must be crimped (dented).
The cup type keywasher must be crimped at two or more positions so that it locks the nut or bolt in position. The inside diameter (ID) of an internal cup type keywasher must also be crimped
(3) Crimping tools
(a) The surface of the tool that is used to cause the crimps (dents) must be spherical in shape. The spherical radius must not be less than 0.05 in. (1.27 mm)
(b) Squeeze action crimping tool
1 This type of tool is used to crimp (dent) the outside diameter of cup type keywashers in to slots in the nut or bolt
This type of tool is recommended and must be used when possible.
(c) Drift type tool
1 A drift tool is a ring which is moved in an axial direction on the cup type keywasher to crimp (dent) the outside diameter
(d) Punch
(4) Number of dents necessary
(a) A nut or bolt must be locked in position by the cup type keywasher with the correct number of dents, after it is correctly engaged and tightened.
If the number of slots in the nut or bolt is less than the necessary number of dents then the cup type keywasher must be crimped at each possible position.
(b) A cup type keywasher which has one tab only, must be crimped as shown
(5) Position control
(a) Movement of the cup type keywasher during the procedure to torque tighten can break the internal tabs. Make a mark on the cupwasher and adjacent surface with a metal marking crayon (Material No.V02-081) . A change in the position of the cup type keywasher can then be seen during the procedure to torque tighten.
(6) A cup type keywasher is correctly installed when:
(b) Dents are made as shown. A correctly installed cup type keywasher will
usually be tight. If the nut does not touch the diaphragm area of the washer, the washer can be moved through the limits of the tab clearance.
(c) The dents in the cup type keywasher are approximately the same shape and size, and not broken, cracked or torn.
(d) The dents are made in to the slots in the nut or bolt, if slots are available.
(e) The cup type keywasher has not moved during assembly.
(1) Cup type keywashers must be used one time only. A new cup type keywasher must be used at each assembly.
(2) The outside diameter (OD) of a cup type keywasher must be crimped (dented).
The cup type keywasher must be crimped at two or more positions so that it locks the nut or bolt in position. The inside diameter (ID) of an internal cup type keywasher must also be crimped
(3) Crimping tools
(a) The surface of the tool that is used to cause the crimps (dents) must be spherical in shape. The spherical radius must not be less than 0.05 in. (1.27 mm)
(b) Squeeze action crimping tool
1 This type of tool is used to crimp (dent) the outside diameter of cup type keywashers in to slots in the nut or bolt
This type of tool is recommended and must be used when possible.
(c) Drift type tool
1 A drift tool is a ring which is moved in an axial direction on the cup type keywasher to crimp (dent) the outside diameter
(d) Punch
CAUTION:
CUP TYPE KEYWASHERS USED WITH FUEL NOZZLE NUTS MUST NOT BE CRIMPED (DENTED) BY THIS PROCEDURE.
1 This type of tool is put in the correct position on the outside diameter of the cup type keywasher and then hit with a hammer. (4) Number of dents necessary
(a) A nut or bolt must be locked in position by the cup type keywasher with the correct number of dents, after it is correctly engaged and tightened.
If the number of slots in the nut or bolt is less than the necessary number of dents then the cup type keywasher must be crimped at each possible position.
(b) A cup type keywasher which has one tab only, must be crimped as shown
(5) Position control
(a) Movement of the cup type keywasher during the procedure to torque tighten can break the internal tabs. Make a mark on the cupwasher and adjacent surface with a metal marking crayon (Material No.V02-081) . A change in the position of the cup type keywasher can then be seen during the procedure to torque tighten.
(6) A cup type keywasher is correctly installed when:
CAUTION:
CUP TYPE KEYWASHERS THAT ARE LOOSE ARE NOT SATISFACTORY.
(a) A new cup type keywasher is installed. (b) Dents are made as shown. A correctly installed cup type keywasher will
usually be tight. If the nut does not touch the diaphragm area of the washer, the washer can be moved through the limits of the tab clearance.
(c) The dents in the cup type keywasher are approximately the same shape and size, and not broken, cracked or torn.
(d) The dents are made in to the slots in the nut or bolt, if slots are available.
(e) The cup type keywasher has not moved during assembly.