DOC AIRBUS | AMM A320FInstallation of the Tab-type Key Washers [IAE]
TASK 70-40-11-911-010-A
Installation of the Tab-type Key Washers
1. Reason for the Job
This task gives instructions on how to bend the keys and elliptical parts of single-hole key washers ; also, key washers for use with more than one hole. A straight key is one that is to be bent after the key washer is installed: while a bent key is one that is bent when the key washer is made.
2. Job Set-up Information
A. Consumable Materials
B. Referenced Information
3. Job Set-up
Subtask 70-40-11-869-051-A ** ON A/C NOT FOR ALL
Subtask 70-40-11-911-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 08:05:20 UTC
Installation of the Tab-type Key Washers
1. Reason for the Job
This task gives instructions on how to bend the keys and elliptical parts of single-hole key washers ; also, key washers for use with more than one hole. A straight key is one that is to be bent after the key washer is installed: while a bent key is one that is bent when the key washer is made.
NOTE: Key washers must be used one time only. Use a new key washer for each assembly.
Key washers must be installed with the straight keys set away from the axis of the parts to be locked. The bent keys must always be set against the mating surface or against the side of the hole to prevent movement of the parts to be locked. 2. Job Set-up Information
A. Consumable Materials
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.V02-081) | metal marking crayon |
| REFERENCE | DESIGNATION |
|---|---|
Install the Key WashersSubtask 70-40-11-869-051-A ** ON A/C NOT FOR ALL
A. Not Applicable
4. ProcedureSubtask 70-40-11-911-050-A ** ON A/C NOT FOR ALL
A. Installation of the Tab-type Key Washers
(1) Straight Keys
(a) All straight keys must be bent after the assembly procedure to make sure that the key washers can not be used again. At least one key must be bent to give the clearance shown at detail B ; At least 75 percent of its width
(as measured at the bottom of the key) must engage with the flat side of the part to be locked. The remaining straight key or keys can then be bent as
necessary.
(2) Bent Keys
(a) The bent keys must be bent to give the clearance shown at detail C.
(3) Elliptical Key Washers
(a) When elliptical key washers are installed they must be bent across a full flat of the part to be locked to give the clearance shown at detail B
(4) Key Washers for use with more than one hole
(a) The data specified in paragraphs A and C must also be applied to the keys for each hole when a key washer for use with more than one hole is installed.
(5) Fuel Nozzle Nut Key Washers
(a) Apply only a pressure to bend the keys of the fuel nozzle nut key washers ; they must not be hit to bend the keys.
(6) Control the Position of the Key Washer
(a) Use a metal marking crayon (Material No.V02-081) to make marks on the key washer and on its adjacent mating surface which does not move. This will show if the key washer turns, when the nut is tightened, which will cause damage to the internal keys.
(7) Basic Specification
(a) The key washers are correctly installed when this basic specification is applied:
(b) a new key washer must always be used.
(c) the keys must always be bent as specified in this procedure.
(d) When the keys are bent the key washer must not shake and also, the locked parts must not come loose.
(1) Straight Keys
(a) All straight keys must be bent after the assembly procedure to make sure that the key washers can not be used again. At least one key must be bent to give the clearance shown at detail B ; At least 75 percent of its width
(as measured at the bottom of the key) must engage with the flat side of the part to be locked. The remaining straight key or keys can then be bent as
necessary.
(2) Bent Keys
(a) The bent keys must be bent to give the clearance shown at detail C.
(3) Elliptical Key Washers
(a) When elliptical key washers are installed they must be bent across a full flat of the part to be locked to give the clearance shown at detail B
(4) Key Washers for use with more than one hole
(a) The data specified in paragraphs A and C must also be applied to the keys for each hole when a key washer for use with more than one hole is installed.
(5) Fuel Nozzle Nut Key Washers
(a) Apply only a pressure to bend the keys of the fuel nozzle nut key washers ; they must not be hit to bend the keys.
(6) Control the Position of the Key Washer
(a) Use a metal marking crayon (Material No.V02-081) to make marks on the key washer and on its adjacent mating surface which does not move. This will show if the key washer turns, when the nut is tightened, which will cause damage to the internal keys.
(7) Basic Specification
(a) The key washers are correctly installed when this basic specification is applied:
(b) a new key washer must always be used.
(c) the keys must always be bent as specified in this procedure.
(d) When the keys are bent the key washer must not shake and also, the locked parts must not come loose.