DOC AIRBUS | AMM A320FFunctional Check of the Fan Cowl Door Latch Tension [CFML]
TASK 71-13-13-720-801-A
Functional Check of the Fan Cowl Door Latch Tension
Refer to the MPD TASK: 711000-L1
FUNCTIONAL CHECK OF FAN COWL LATCHES TENSION.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 71-13-13-941-072-A
Subtask 71-13-13-942-054-A
[Rev.10 from 2021]
2026.04.02 06:33:20 UTC
Functional Check of the Fan Cowl Door Latch Tension
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 JobRefer to the MPD TASK: 711000-L1
FUNCTIONAL CHECK OF FAN COWL LATCHES TENSION.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | GAGE - PUSH-PULL |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-11-820-802-A | Adjustment of the Fan Cowl Doors Clearance |
| TASK 71-13-13-820-801-A | Adjustment of the Fan Cowl Door Latches |
Functional Check of the Fan Cowl Latch TensionSubtask 71-13-13-941-072-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 71-13-13-820-055-A A. Functional 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 an adjustment of the latch tension for the fan cowl doors (Ref. AMM TASK 71-13-13-820-801).
(11) Close the mid latch with your hand.
Subtask 71-13-13-820-056-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 an adjustment of the latch tension for the fan cowl doors (Ref. AMM TASK 71-13-13-820-801).
(11) Close the mid latch with your hand.
B. Functional Check of the Aft Latch Tension
(1) Push the latch handle trigger of the aft latch L3 to open the latch.
(2) Pull the latch handle to the fully open position.
(4) Move the latch handle until the keeper makes 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 an adjustment of the latch tension for the fan cowl doors (Ref. AMM TASK 71-13-13-820-801).
(11) Close the aft latch with your hand.
Subtask 71-13-13-820-057-A (1) Push the latch handle trigger of the aft latch L3 to open the latch.
(2) Pull the latch handle to the fully open position.
NOTE: The mid latch L2 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 makes 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 an adjustment of the latch tension for the fan cowl doors (Ref. AMM TASK 71-13-13-820-801).
(11) Close the aft latch with your hand.
C. Functional Check of the forward Latch Tension
(1) Push the latch handle trigger of the forward latch L1 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 6.94 daN (15.60 lbf) and 8.72 daN (19.60 lbf).
(a) If the force necessary to close the latch is out of the limits, do an adjustment of the latch tension for the fan cowl doors (Ref. AMM TASK 71-13-13-820-801).
(11) Close the forward latch L1 with your hand.
Subtask 71-13-13-210-055-A (1) Push the latch handle trigger of the forward latch L1 to open the latch.
(2) Pull the latch handle to the fully open position.
NOTE: The aft latch L3 and mid latch L2 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 6.94 daN (15.60 lbf) and 8.72 daN (19.60 lbf).
(a) If the force necessary to close the latch is out of the limits, do an adjustment of the latch tension for the fan cowl doors (Ref. AMM TASK 71-13-13-820-801).
(11) Close the forward latch L1 with your hand.
D. Visual Check of the Contact between the Spigot and the Bolt with its Respective RH Housing
(1) In L1 housing, check that there are contact between spigot and the bolt with the RH L1 housing.
(2) In L2 housing, check that there are contact between spigot and the bolt with the RH L2 housing.
(3) In L3 housing, check that there are contact between spigot and the bolt with the RH L3 housing.
(4) If a gap is detected between spigot and/or bolt with the RH housing
(a) Do the Adjustment of the Fan Cowl Doors Clearance (Ref. AMM TASK 71-13-11-820-802).
(b) Do the Adjustment of the Fan Cowl Door Latches (Ref. AMM TASK 71-13-13-820-801).
(c) Do again the step 4.
5. Close-up(1) In L1 housing, check that there are contact between spigot and the bolt with the RH L1 housing.
(2) In L2 housing, check that there are contact between spigot and the bolt with the RH L2 housing.
(3) In L3 housing, check that there are contact between spigot and the bolt with the RH L3 housing.
(4) If a gap is detected between spigot and/or bolt with the RH housing
(a) Do the Adjustment of the Fan Cowl Doors Clearance (Ref. AMM TASK 71-13-11-820-802).
(b) Do the Adjustment of the Fan Cowl Door Latches (Ref. AMM TASK 71-13-13-820-801).
(c) Do again the step 4.
Subtask 71-13-13-942-054-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).