DOC AIRBUS | AMM A320FRemoval of the Transcowl Pressure Seals [CFML]
TASK 78-32-48-000-802-A
Removal of the Transcowl Pressure Seals
A. This procedure gives the instructions to remove a translating cowl (transcowl) pressure seal.
B. Each transcowl half has several pressure seal segments. You can replace one segment and keep the other segments installed.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 78-32-48-941-057-A
Subtask 78-32-48-020-055-A
[Rev.10 from 2021]
2026.04.01 13:13:38 UTC
Removal of the Transcowl Pressure Seals
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.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the JobA. This procedure gives the instructions to remove a translating cowl (transcowl) pressure seal.
B. Each transcowl half has several pressure seal segments. You can replace one segment and keep the other segments installed.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE |
| No specific | 1 | BLADE - RAZOR |
| No specific | 1 | SCRAPER - PLASTIC |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CPNCL02069) | LINT-FREE COTTON CLOTH |
| (Material No.CPNCL02086) | SCOTCH BRITE PADS |
| (Material No.CPNCL02662) | ISOPROPYL ALCOHOL |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1) | |
| 437AL, 438AR | |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2) | |
| 447AL, 448AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-803-A | Opening of the Fan Cowl Doors |
| TASK 78-30-00-040-807-A | Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU) |
| TASK 78-32-15-000-801-A | Removal of the Slat Panel |
| TASK 78-32-43-000-806-A | Removal of the Thrust Reverser Cascades |
| TASK 78-32-50-010-801-A | Manually Deploy the Translating Cowl |
| TASK 78-36-45-000-801-A | Removal of the Thrust Reverser Hinge Access Panels |
Transcowl Pressure SealsSubtask 78-32-48-941-057-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).
Subtask 78-32-48-010-062-A (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
- 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).
B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
Subtask 78-32-48-040-057-A (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
C. Deactivation of the Thrust Reverser System for Nacelle Maintenance
Subtask 78-32-48-010-063-A WARNING:
YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.
(1) Do the deactivation of the thrust reverser system for nacelle maintenance (Ref. AMM TASK 78-30-00-040-807). D. Get access
(1) Manually deploy the transcowl approximately 10 in. (254 mm) (Ref. AMM TASK 78-32-50-010-801).
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
(3) Remove cascades as necessary to get access to the forward seal segment(s) that you will replace (Ref. AMM TASK 78-32-43-000-806) as follows:
(a) To remove the upper segment of a forward pressure seal, you must remove the No. 1 (blank) cascade (Ref. AMM TASK 78-32-43-000-806).
(b) To remove the No. 1 (blank) cascade, remove the hinge access panel (Ref. AMM TASK 78-36-45-000-801) and the slat clearance panel (Ref. AMM TASK 78-32-15-000-801).
(c) Remove the other cascades as necessary to get access to the seal segment you will replace. It is usually recommended to remove the cascade immediately above and below each seal segment. It is usually recommended to remove every other cascade. There is not a limit to the number of cascades that can be removed at one time.
4. Procedure(1) Manually deploy the transcowl approximately 10 in. (254 mm) (Ref. AMM TASK 78-32-50-010-801).
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
(3) Remove cascades as necessary to get access to the forward seal segment(s) that you will replace (Ref. AMM TASK 78-32-43-000-806) as follows:
(a) To remove the upper segment of a forward pressure seal, you must remove the No. 1 (blank) cascade (Ref. AMM TASK 78-32-43-000-806).
(b) To remove the No. 1 (blank) cascade, remove the hinge access panel (Ref. AMM TASK 78-36-45-000-801) and the slat clearance panel (Ref. AMM TASK 78-32-15-000-801).
(c) Remove the other cascades as necessary to get access to the seal segment you will replace. It is usually recommended to remove the cascade immediately above and below each seal segment. It is usually recommended to remove every other cascade. There is not a limit to the number of cascades that can be removed at one time.
Subtask 78-32-48-020-055-A
A. Removal of the Segment (1) of the Transcowl Pressure Seal
(2) Record the location of the sealant to help during installation.
(3) Use a BLADE - RAZOR to cut through the bead of sealant at the joint. Be very careful not to damage the adjacent segment. You can cut the damaged segment into pieces to make removal easier.
(4) If you remove a middle segment, cut though the joints that connect to the upper and the lower adjected segments.
(5) The upper end of the upper segment and the lower end of the lower segment are sealed to the acoustic panel (5) with a bead of sealant. Cut through this bead of sealant with a BLADE - RAZOR.
(6) Record the location of the sealant to help during installation.
(7) After the beads of sealant are cut, you can remove the segment from the C-channel (2) attached to the transcowl. Hold the damaged seal with your hands and pull the seal out of the C-channel.
PRE SB BD70CR78-005
(a) Slowly, begin to peel out the seal until completely removed.
(b) Remove all the remaining unwanted sealant with a BLADE - RAZOR or a SCRAPER - PLASTIC
(c) You can use ISOPROPYL ALCOHOL (Material No.CPNCL02662) on a LINT-FREE COTTON CLOTH (Material No.CPNCL02069) or a SCOTCH BRITE PADS (Material No.CPNCL02086) to clean the repair area.
(d) Let the repair area dry.
END OF PRE SB BD70CR78-005
POST SB BD70CR78-005
(e) Seals are bonded into the C-channel with sealant. Slowly, begin to peel out the seal and use a BLADE - RAZOR to cut this bead of sealant.
(f) Remove all the remaining unwanted sealant with a BLADE - RAZOR or a SCRAPER - PLASTIC.
(g) You can use ISOPROPYL ALCOHOL (Material No.CPNCL02662) on a LINT-FREE COTTON CLOTH (Material No.CPNCL02069) or a SCOTCH BRITE PADS (Material No.CPNCL02086) to clean the repair area.
(h) Let the repair area dry.
END OF POST SB BD70CR78-005
Subtask 78-32-48-020-057-A NOTE: This task is given for the left translating-cowl pressure seal. It is applicable to the right translating-cowl pressure seal.
NOTE: This procedure is applicable to pressure seal segment (1). It is also applicable to the other pressure seal segments (3), (4), (26) thru (32).
(1) Examine the joint between the segment you will remove and the adjacent segment(s). These joints are sealed with a bead of sealant. The upper and lower segments have male ends with a smaller diameter that go into the female ends of the middle segment. (2) Record the location of the sealant to help during installation.
(3) Use a BLADE - RAZOR to cut through the bead of sealant at the joint. Be very careful not to damage the adjacent segment. You can cut the damaged segment into pieces to make removal easier.
(4) If you remove a middle segment, cut though the joints that connect to the upper and the lower adjected segments.
(5) The upper end of the upper segment and the lower end of the lower segment are sealed to the acoustic panel (5) with a bead of sealant. Cut through this bead of sealant with a BLADE - RAZOR.
(6) Record the location of the sealant to help during installation.
(7) After the beads of sealant are cut, you can remove the segment from the C-channel (2) attached to the transcowl. Hold the damaged seal with your hands and pull the seal out of the C-channel.
PRE SB BD70CR78-005
(a) Slowly, begin to peel out the seal until completely removed.
(b) Remove all the remaining unwanted sealant with a BLADE - RAZOR or a SCRAPER - PLASTIC
(c) You can use ISOPROPYL ALCOHOL (Material No.CPNCL02662) on a LINT-FREE COTTON CLOTH (Material No.CPNCL02069) or a SCOTCH BRITE PADS (Material No.CPNCL02086) to clean the repair area.
(d) Let the repair area dry.
END OF PRE SB BD70CR78-005
POST SB BD70CR78-005
(e) Seals are bonded into the C-channel with sealant. Slowly, begin to peel out the seal and use a BLADE - RAZOR to cut this bead of sealant.
(f) Remove all the remaining unwanted sealant with a BLADE - RAZOR or a SCRAPER - PLASTIC.
(g) You can use ISOPROPYL ALCOHOL (Material No.CPNCL02662) on a LINT-FREE COTTON CLOTH (Material No.CPNCL02069) or a SCOTCH BRITE PADS (Material No.CPNCL02086) to clean the repair area.
(h) Let the repair area dry.
END OF POST SB BD70CR78-005
B. Removal of Transcowl Leaf Seals
(1) Remove the left side transcowl aft lower seal (6) from the aft lower seal retainer (7) as follows:
(a) Record the location of the sealant to help during installation.
(b) The ends of the aft lower seal are sealed to the transcowl with a bead of sealant. Cut through this bead of sealant with a BLADE - RAZOR.
(c) After the beads of sealant are cut, you can remove the segment from the C-channel of the retainer attached to the transcowl. Hold the seal with your hands and pull the seal out of the C-channel.
(2) Remove the left side transcowl aft upper seal (12) as follows:
(a) Remove the two bolts (8), one bolt (9), one bolt (10) and three bolts (11).
(b) Remove the aft upper seal (12), aft upper seal retainer assembly (13) and upper seal retainer assembly (14) from the transcowl.
(3) Remove the right side transcowl aft lower seals (15) and (16) from the aft lower seal retainers (24) and (25) as follows:
(a) Record the location of the sealant to help during installation.
(b) The ends of the aft lower seals are sealed to the transcowl and adjacent seal segment with a bead of sealant. Cut through this bead of sealant with a BLADE - RAZOR.
(c) After the beads of sealant are cut, you can remove the segments from the C-channels of the retainers attached to the transcowl. Hold the seals with your hands and pull the seals out of the C-channel.
(4) Remove the right side transcowl aft upper seal (20) as follows:
(a) Remove the two bolts (17), one bolt (18), one bolt (19) and three bolts (21).
(b) Remove the aft upper seal (20), aft upper seal retainer assembly (22) and upper seal retainer assembly (23) from the transcowl.
Subtask 78-32-48-020-056-A (1) Remove the left side transcowl aft lower seal (6) from the aft lower seal retainer (7) as follows:
(a) Record the location of the sealant to help during installation.
(b) The ends of the aft lower seal are sealed to the transcowl with a bead of sealant. Cut through this bead of sealant with a BLADE - RAZOR.
(c) After the beads of sealant are cut, you can remove the segment from the C-channel of the retainer attached to the transcowl. Hold the seal with your hands and pull the seal out of the C-channel.
(2) Remove the left side transcowl aft upper seal (12) as follows:
(a) Remove the two bolts (8), one bolt (9), one bolt (10) and three bolts (11).
(b) Remove the aft upper seal (12), aft upper seal retainer assembly (13) and upper seal retainer assembly (14) from the transcowl.
(3) Remove the right side transcowl aft lower seals (15) and (16) from the aft lower seal retainers (24) and (25) as follows:
(a) Record the location of the sealant to help during installation.
(b) The ends of the aft lower seals are sealed to the transcowl and adjacent seal segment with a bead of sealant. Cut through this bead of sealant with a BLADE - RAZOR.
(c) After the beads of sealant are cut, you can remove the segments from the C-channels of the retainers attached to the transcowl. Hold the seals with your hands and pull the seals out of the C-channel.
(4) Remove the right side transcowl aft upper seal (20) as follows:
(a) Remove the two bolts (17), one bolt (18), one bolt (19) and three bolts (21).
(b) Remove the aft upper seal (20), aft upper seal retainer assembly (22) and upper seal retainer assembly (23) from the transcowl.
C. Removal of the Primary Slider Block Seal 12 o'clock and the Primary Slider Block Seal 6 o'clock
(b) Remove the left primary slider block seal 12 o'clock (33).
(c) Remove unwanted sealant with a BLADE - RAZOR or a SCRAPER - PLASTIC.
(d) You can use ISOPROPYL ALCOHOL (Material No.CPNCL02662) on a SCOTCH BRITE PADS (Material No.CPNCL02086) or a SCOTCH BRITE PADS (Material No.CPNCL02086) to clean the repair area.
(e) Let the repair area dry.
(2) Removal of the left primary slider block seal 6 o'clock (34):
(b) Remove the left primary slider block seal 6 o'clock (34).
(c) Remove unwanted sealant with a BLADE - RAZOR or a SCRAPER - PLASTIC.
(d) You can use ISOPROPYL ALCOHOL (Material No.CPNCL02662) on a SCOTCH BRITE PADS (Material No.CPNCL02086) or a SCOTCH BRITE PADS (Material No.CPNCL02086) to clean the repair area.
(e) Let the repair area dry.
NOTE: This procedure is for the left primary slider block seal 12 o'clock and the left primary slider block seal 6 o'clock. It is also applicable to the right primary slider block seal 12 o'clock and the right primary slider block seal 6 o'clock.
(1) Removal of the left primary slider block seal 12 o'clock (33): CAUTION:
BE CAREFUL NOT TO CAUSE DAMAGE TO THE ADJACENT PARTS WHEN YOU DO THIS STEP.
(a) Remove the bead of sealant at the joint. (b) Remove the left primary slider block seal 12 o'clock (33).
(c) Remove unwanted sealant with a BLADE - RAZOR or a SCRAPER - PLASTIC.
(d) You can use ISOPROPYL ALCOHOL (Material No.CPNCL02662) on a SCOTCH BRITE PADS (Material No.CPNCL02086) or a SCOTCH BRITE PADS (Material No.CPNCL02086) to clean the repair area.
(e) Let the repair area dry.
(2) Removal of the left primary slider block seal 6 o'clock (34):
CAUTION:
BE CAREFUL NOT TO CAUSE DAMAGE TO THE ADJACENT PARTS WHEN YOU DO THIS STEP.
(a) Remove the bead of sealant at the joint. (b) Remove the left primary slider block seal 6 o'clock (34).
(c) Remove unwanted sealant with a BLADE - RAZOR or a SCRAPER - PLASTIC.
(d) You can use ISOPROPYL ALCOHOL (Material No.CPNCL02662) on a SCOTCH BRITE PADS (Material No.CPNCL02086) or a SCOTCH BRITE PADS (Material No.CPNCL02086) to clean the repair area.
(e) Let the repair area dry.