DOC AIRBUS | AMM A320FAdjustment of the Fan Cowl Door Latches [CFML]
TASK 71-13-13-820-801-A
Adjustment of the Fan Cowl Door Latches
The fan cowl door latches must be adjusted each time you replace:
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 71-13-13-941-071-A
Subtask 71-13-13-942-053-A
[Rev.10 from 2021]
2026.04.01 02:34:56 UTC
Adjustment of the Fan Cowl Door Latches
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.
1. Reason for the JobThe fan cowl door latches must be adjusted each time you replace:
- The fan cowl door latches
- The fan cowl door keepers
- The engine
- The thrust reverser cowl-doors.
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | GAGE - PUSH-PULL |
| No specific | 1 | SCREWDRIVER |
| No specific | AR | WARNING NOTICE(S) |
| No specific | 1 | WRENCH - HEXAGONAL |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-803-A | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-803-A | Closing of the Fan Cowl Doors |
| TASK 71-13-11-820-802-A | Adjustment of the Fan Cowl Doors Clearance |
Adjustment of the Fan Cowl Door LatchesSubtask 71-13-13-941-071-A
A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
4. Procedure(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:
- The ENG/MODE selector switch, and
- The ENG/MASTER 1(2) control switch.
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
CAUTION:
DO A CHECK AND ADJUST THE LATCH TENSION IN THIS SEQUENCE: MID LATCH (L2), AFT LATCH (L3) AND FWD LATCH (L1).
IF YOU DO NOT OBEY THIS INSTRUCTION, YOU CAN CAUSE DAMAGE TO THE EQUIPMENT.
Subtask 71-13-13-820-054-A A. Check of the Mid Latch Tension
(1) Push the latch handle trigger of the mid latch L2 to open the latch.
(2) Pull the latch handle to the fully open position.
(4) Move the latch handle until the keeper make contact with the housing wall and do a check visually.
(5) Start closing the handle without measuring the load.
(6) Make sure that the keeper translates.
(7) When the keeper movement is stopped, the load must be measured with a GAGE - PUSH-PULL located in the latch handle hole.
(8) Put the GAGE - PUSH-PULL in position at the end of the latch handle hole.
(9) Close the latch slowly with the GAGE - PUSH-PULL and measure the force necessary to fully close the latch handle.
(10) Make sure that the measured force is between 6.1 daN (13.71 lbf) and 7.7 daN (17.31 lbf).
(a) If the force necessary to close the latch is out of the limits, do the adjustment of the latch tension for the fan cowl doors. Refer to step. 4.D.
(11) Do the final check. Refer to step. 4.G.
Subtask 71-13-13-820-058-A (1) Push the latch handle trigger of the mid latch L2 to open the latch.
(2) Pull the latch handle to the fully open position.
NOTE: The aft latch L3 and forward latch L1 must be closed.
(3) Make sure that the hook is engaged with its keeper. (4) Move the latch handle until the keeper make contact with the housing wall and do a check visually.
(5) Start closing the handle without measuring the load.
(6) Make sure that the keeper translates.
(7) When the keeper movement is stopped, the load must be measured with a GAGE - PUSH-PULL located in the latch handle hole.
(8) Put the GAGE - PUSH-PULL in position at the end of the latch handle hole.
(9) Close the latch slowly with the GAGE - PUSH-PULL and measure the force necessary to fully close the latch handle.
(10) Make sure that the measured force is between 6.1 daN (13.71 lbf) and 7.7 daN (17.31 lbf).
(a) If the force necessary to close the latch is out of the limits, do the adjustment of the latch tension for the fan cowl doors. Refer to step. 4.D.
(11) Do the final check. Refer to step. 4.G.
B. Check of the Aft Latch Tension
(1) Do the step 4.A. for the aft latch L3.
Subtask 71-13-13-820-059-A (1) Do the step 4.A. for the aft latch L3.
NOTE: The mid latch L2 and forward latch L1 must be closed.
C. Check of the Forward Latch Tension
(1) Do the step 4.A. for the forward latch L1.
Subtask 71-13-13-820-060-A (1) Do the step 4.A. for the forward latch L1.
NOTE: The aft latch L3 and mid latch L2 must be closed.
D. Adjustment of the Mid Latch L2
(1) Push the latch handle trigger of the mid latch L2 to open the latch.
(2) Pull the latch handle to the fully open position.
(5) When the closure force of latch L2 is correct, do the step 4.G.
Subtask 71-13-13-820-061-A (1) Push the latch handle trigger of the mid latch L2 to open the latch.
(2) Pull the latch handle to the fully open position.
NOTE: The aft latch L3 and forward latch L1 must be closed.
(3) Use a WRENCH - HEXAGONAL or a SCREWDRIVER and turn the adjustment nut of the keeper. NOTE: Turn the adjustment nut clockwise to increase the tension and counter-clockwise to decrease the tension.
(4) Do steps 4.A. until the latch tension value of L2 is between 6.1 daN (13.71 lbf) and 7.7 daN (17.31 lbf). (5) When the closure force of latch L2 is correct, do the step 4.G.
E. Adjustment of the Aft Latch L3
(1) Do the step 4.D. for the aft latch L3 to get a correct adjustment of the latch tension.
Subtask 71-13-13-820-062-A (1) Do the step 4.D. for the aft latch L3 to get a correct adjustment of the latch tension.
NOTE: The mid latch L2 and forward latch L1 must be closed.
F. Adjustment of the Forward Latch L1
(1) Do the step 4.D. for the forward latch L1 to get a correct adjustment of the latch tension.
Subtask 71-13-13-820-063-A (1) Do the step 4.D. for the forward latch L1 to get a correct adjustment of the latch tension.
NOTE: The aft latch L3 and mid latch L2 must be closed.
G. Final Check
(1) Do a final check in the sequence L2, L3 and L1:
(a) Do the step 4.A for the latch L2.
(b) Do the step 4.B. for the latch L3.
(c) Do the step 4.C. for the latch L1.
(d) If step 4.G.(1) is satisfactory, do the next step 4.G.(2).
(2) Check the contact between the spigot and the bolt with its respective right hand housing.
(a) In L1 housing, check that there are contact between spigot and the bolt with the right hand L1 housing.
1 Do the step 4.G.(2).(a). for the L2 housing.
(c) In L3 housing, check that there are contact between spigot and the bolt with the right hand L3 housing.
1 Do the step 4.G.(2).(a). for the L3 housing.
(d) If a gap is detected between spigot and/or bolt with the right hand housing:
1 Do the adjustment of the fan cowl doors clearance (Ref. AMM TASK 71-13-11-820-802).
2 Do again the steps 4.A thru 4.C.
5. Close-up(1) Do a final check in the sequence L2, L3 and L1:
(a) Do the step 4.A for the latch L2.
(b) Do the step 4.B. for the latch L3.
(c) Do the step 4.C. for the latch L1.
(d) If step 4.G.(1) is satisfactory, do the next step 4.G.(2).
(2) Check the contact between the spigot and the bolt with its respective right hand housing.
(a) In L1 housing, check that there are contact between spigot and the bolt with the right hand L1 housing.
NOTE: You can use these procedures to make sure if the spigot or the bolt touch the right hand housing:
(b) In L2 housing, check that there are contact between spigot and the bolt with the right hand L2 housing. - First procedure:
a. Do a visual inspection of the zone.
b. Introduce a feeler gauge between the existing gap between the fan cowl doors. - Second procedure:
a. Open the left fan cowl door (Ref. AMM TASK 71-13-00-010-803).
b. Do a mark on the bolt head with a marker pen.
c. Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803).
d. Close the latches.
e. Open the right fan cowl door (Ref. AMM TASK 71-13-00-010-803).
f. Examine if there is a mark on the forward wall of the housing.
1 Do the step 4.G.(2).(a). for the L2 housing.
(c) In L3 housing, check that there are contact between spigot and the bolt with the right hand L3 housing.
1 Do the step 4.G.(2).(a). for the L3 housing.
(d) If a gap is detected between spigot and/or bolt with the right hand housing:
1 Do the adjustment of the fan cowl doors clearance (Ref. AMM TASK 71-13-11-820-802).
2 Do again the steps 4.A thru 4.C.
Subtask 71-13-13-942-053-A
A. Make sure that the work area is clean and clear of tools and other items.
(1) Put the aircraft back to its initial configuration.
(2) Remove the WARNING NOTICE(S).
(1) Put the aircraft back to its initial configuration.
(2) Remove the WARNING NOTICE(S).