DOC AIRBUS | AMM A320FInstallation of the Emergency Ram Air Inlet and Air Inlet Ducts
TASK 21-55-52-400-801-A
Installation of the Emergency Ram Air Inlet and Air Inlet Ducts
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Expendable Parts
E. Referenced Information
3. Job Set-up
Subtask 21-55-52-860-050-A
Subtask 21-55-52-420-050-A
Subtask 21-55-52-865-052-A
[Rev.10 from 2021]
2026.04.02 06:11:33 UTC
Installation of the Emergency Ram Air Inlet and Air Inlet Ducts
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE |
| No specific | 1 | SCRAPER - NON METALLIC |
| No specific | Torque wrench: range to between 0.37 and 0.28 m.daN (32.74 and 24.78 lbf.in )  |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.05EAR1) | Epoxy Adhesive-General Up to 60°C - |
| (Material No.06AAC1) | Polysulfide Sealant-General Purpose Interfay - |
| (Material No.08BBD1) | Non Aqueous Cleaner-- Isopropyl Alcohol - |
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 191AB, 191BB |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 10 | COTTER-PINS | AIPC 21-55-02-01-090 |
| 24 | PIN | AIPC 21-55-02-02-130 |
| 10 | COTTER-PINS | AIPC 21-55-82-01-100 |
| 24 | PIN | AIPC 21-55-82-02-115 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 21-55-51-400-001-A | Installation of the Emergency Ram Air Inlet Actuator |
| TASK 24-42-00-861-001-A | Energize the Ground Service Network from the External Power |
| TASK 24-42-00-862-001-A | De-energize the Ground Service Network Supplied from the External Power |
Emergency Ram-Air Inlet and Air Inlet DuctsSubtask 21-55-52-860-050-A
A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
Subtask 21-55-52-865-051-A (1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
Subtask 21-55-52-010-051-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | AIR COND/RAM/AIR/INLET | 1HZ | D10 |
C. Get Access
(1) Make sure that the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE is in position at the access panel 191AB.
(2) Make sure that the access panel 191AB and 191BB are removed.
4. Procedure(1) Make sure that the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE is in position at the access panel 191AB.
(2) Make sure that the access panel 191AB and 191BB are removed.
Subtask 21-55-52-420-050-A
A. Installation of the Air Inlet Ducts
(1) Do a visual inspection of the component interfaces and the adjacent area.
(2) Clean the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) If you install the new upper air-inlet duct (21):
(a) Hold the upper air-inlet duct (21) in position between the bracket supports (19).
(b) Make temporary marks on the upper air-inlet duct (21) to drill the holes. This will help you to attach the upper air-inlet duct (21) with the bracket supports (19) in the same position.
(c) To drill the holes in the upper air-inlet duct (21), send it to the workshop:
1 Drill holes of diameter 4.860 mm (0.191 in.) to 4.910 mm (0.193 in.) on the temporary marks of the upper air-inlet duct (21).
(d) Remove all dust and loose particles from the upper air-inlet duct (21).
(e) Clean the holes of the upper air-inlet duct (21) with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-- Isopropyl Alcohol - (Material No.08BBD1) .
(5) If necessary, remove the remaining adhesive from the collar (31) and the upper air-inlet duct (21) with the SCRAPER - NON METALLIC.
(6) Clean the mating surfaces of the collar (31) and the upper air-inlet duct (21) with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-- Isopropyl Alcohol - (Material No.08BBD1) .
(7) Apply a layer of Epoxy Adhesive-General Up to 60°C - (Material No.05EAR1) on the mating surfaces of the collar (31) and the upper air-inlet duct (21).
(8) Carefully install the collar (31) on the upper air-inlet duct (21).
(9) Obey the manufacturer's instructions and the correct curing time for the adhesive.
(10) Apply a layer of Polysulfide Sealant-General Purpose Interfay - (Material No.06AAC1) on the mating surfaces of the bracket supports (19).
(11) Hold the upper air-inlet duct (21) in position between the bracket supports (19).
(12) Install the bolts (22) and the nuts (20), but do not tighten the nuts (20) at this time.
(13) Put the gasket (16) in position and install the washers (17) and the screws (18) on the flange.
(14) Tighten the screws (18).
(15) Tighten the nuts (20) to the bracket supports (19).
(16) Put the shutter (29) and the lower air-inlet duct (28) in position and install the screws (30) and (22) and the nuts (20).
(17) Tighten the nuts (20).
(18) Put the link (25) in position and install the pin (26) and the washers (27).
(20) Install the pin (23) and the washers (27).
Subtask 21-55-52-420-051-A (1) Do a visual inspection of the component interfaces and the adjacent area.
(2) Clean the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) If you install the new upper air-inlet duct (21):
(a) Hold the upper air-inlet duct (21) in position between the bracket supports (19).
(b) Make temporary marks on the upper air-inlet duct (21) to drill the holes. This will help you to attach the upper air-inlet duct (21) with the bracket supports (19) in the same position.
(c) To drill the holes in the upper air-inlet duct (21), send it to the workshop:
1 Drill holes of diameter 4.860 mm (0.191 in.) to 4.910 mm (0.193 in.) on the temporary marks of the upper air-inlet duct (21).
(d) Remove all dust and loose particles from the upper air-inlet duct (21).
(e) Clean the holes of the upper air-inlet duct (21) with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-- Isopropyl Alcohol - (Material No.08BBD1) .
(5) If necessary, remove the remaining adhesive from the collar (31) and the upper air-inlet duct (21) with the SCRAPER - NON METALLIC.
(6) Clean the mating surfaces of the collar (31) and the upper air-inlet duct (21) with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-- Isopropyl Alcohol - (Material No.08BBD1) .
(7) Apply a layer of Epoxy Adhesive-General Up to 60°C - (Material No.05EAR1) on the mating surfaces of the collar (31) and the upper air-inlet duct (21).
(8) Carefully install the collar (31) on the upper air-inlet duct (21).
(9) Obey the manufacturer's instructions and the correct curing time for the adhesive.
(10) Apply a layer of Polysulfide Sealant-General Purpose Interfay - (Material No.06AAC1) on the mating surfaces of the bracket supports (19).
(11) Hold the upper air-inlet duct (21) in position between the bracket supports (19).
(12) Install the bolts (22) and the nuts (20), but do not tighten the nuts (20) at this time.
(13) Put the gasket (16) in position and install the washers (17) and the screws (18) on the flange.
(14) Tighten the screws (18).
(15) Tighten the nuts (20) to the bracket supports (19).
(16) Put the shutter (29) and the lower air-inlet duct (28) in position and install the screws (30) and (22) and the nuts (20).
(17) Tighten the nuts (20).
(18) Put the link (25) in position and install the pin (26) and the washers (27).
WARNING:
USE PROTECTIVE GOGGLES WHEN YOU REMOVE OR INSTALL A COTTER PIN. EACH TIME YOU REMOVE A COTTER PIN DURING THE TASK, DISCARD IT IMMEDIATELY. A LOOSE COTTER PIN CAN CUT YOU OR MAKE YOU BLIND.
(19) Install the new AIPC 21-55-02-02-130 PIN (24) or AIPC 21-55-82-02-115 PIN (24) as applicable on the pin (26). (20) Install the pin (23) and the washers (27).
WARNING:
USE PROTECTIVE GOGGLES WHEN YOU REMOVE OR INSTALL A COTTER PIN. EACH TIME YOU REMOVE A COTTER PIN DURING THE TASK, DISCARD IT IMMEDIATELY. A LOOSE COTTER PIN CAN CUT YOU OR MAKE YOU BLIND.
(21) Install the new AIPC 21-55-02-02-130 PIN (24) or AIPC 21-55-82-02-115 PIN (24) as applicable on the pin (23). B. Installation of the Emergency Ram Air Inlet
(1) Put the emergency ram air inlet (15) in position.
(2) Install the screws (13), the washers (14), the washers (12) and the nuts (11).
(4) Install the new AIPC 21-55-02-01-090 COTTER-PINS (10) or AIPC 21-55-82-01-100 COTTER-PINS (10).
(5) Install the inlet panel (9).
(6) Install the screws (8), the washers (6) and the shim washers (4) on the inlet panel (9).
(7) TORQUE the screws (8) to between 0.37 and 0.28 m.daN (32.74 and 24.78 lbf.in ).
(8) Install the inlet panel (5).
(9) Install the screws (8) and (7), the washers (6) and the shim washers (4) on the inlet panel (5).
.
(11) Install the screw (3), the bonding strap (2) and the nut (1).
(12) Tighten the nut (1).
(13) Install the Emergency Ram Air Inlet Actuator (Ref. AMM TASK 21-55-51-400-001).
5. Close-up(1) Put the emergency ram air inlet (15) in position.
(2) Install the screws (13), the washers (14), the washers (12) and the nuts (11).
NOTE: Install the washers (14) to adjust the GAP between 3 +1.50 mm or -1.50 mm (0.12 +0.06 in. or -0.06 in.) in both sides between the RAM Air Inlet and the fuselage.
NOTE: Adjust the GAP between 0 +0.25 mm or +0.05 mm (0.00 +0.01 in. or +0.00 in.) in the washers (14) position.
(3) Tighten the nuts (11). (4) Install the new AIPC 21-55-02-01-090 COTTER-PINS (10) or AIPC 21-55-82-01-100 COTTER-PINS (10).
(5) Install the inlet panel (9).
(6) Install the screws (8), the washers (6) and the shim washers (4) on the inlet panel (9).
(7) TORQUE the screws (8) to between 0.37 and 0.28 m.daN (32.74 and 24.78 lbf.in )
. (8) Install the inlet panel (5).
(9) Install the screws (8) and (7), the washers (6) and the shim washers (4) on the inlet panel (5).
NOTE: The shim washers (4) should only be installed to adjust the non-level of the inlet panels.
(10) TORQUE the screws (8) and (7) to between 0.37 and 0.28 m.daN (32.74 and 24.78 lbf.in ) . (11) Install the screw (3), the bonding strap (2) and the nut (1).
(12) Tighten the nut (1).
(13) Install the Emergency Ram Air Inlet Actuator (Ref. AMM TASK 21-55-51-400-001).
Subtask 21-55-52-865-052-A
A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 21-55-52-410-050-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | AIR COND/RAM/AIR/INLET | 1HZ | D10 |
B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel 191AB.
(3) Remove the access platform(s).
Subtask 21-55-52-862-050-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel 191AB.
(3) Remove the access platform(s).