DOC AIRBUS | AMM A320FInstallation of the AFT Cargo-Compartment Ventilation Isolation-Valves
TASK 21-28-52-400-001-A
Installation of the AFT Cargo-Compartment Ventilation Isolation-Valves
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 21-28-52-860-050-A ** ON A/C NOT FOR ALL
Subtask 21-28-52-420-050-A ** ON A/C NOT FOR ALL
Subtask 21-28-52-410-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.02 06:11:12 UTC
Installation of the AFT Cargo-Compartment Ventilation Isolation-Valves
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 2M (6 FT) |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| FOR [33HN] (ISOL VALVE AFT CARGO OUTLET) | ||
| No specific | Torque wrench: range to between 0.56 and 0.51 m.daN (49.56 and 45.13 lbf.in )  | |
| FOR [34HN] (ISOL VALVE AFT CARGO INLET) | ||
| No specific | Torque wrench: range to between 0.56 and 0.51 m.daN (49.56 and 45.13 lbf.in ) | |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 826 | |
| FOR [33HN] (ISOL VALVE AFT CARGO OUTLET) | |
| 162DW | |
| FOR [34HN] (ISOL VALVE AFT CARGO INLET) | |
| 151EW | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 21-28-00-710-006-A | Operational Test of the AFT Cargo-Compartment Ventilation-System |
| TASK 24-41-00-861-002-A | Energize the Aircraft Electrical Circuits from the External Power |
| TASK 24-41-00-861-002-A-01 | Energize the Aircraft Electrical Circuits from the APU |
| TASK 24-41-00-861-002-A-02 | Energize the Aircraft Electrical Circuits from Engine 1(2) |
| TASK 24-41-00-862-002-A | De-energize the Aircraft Electrical Circuits Supplied from the External Power |
| TASK 24-41-00-862-002-A-01 | De-energize the Aircraft Electrical Circuits Supplied from the APU |
| TASK 24-41-00-862-002-A-02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
| TASK 52-30-00-860-001-A | Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump |
| TASK 52-30-00-860-002-A | Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump |
| FOR [33HN] (ISOL VALVE AFT CARGO OUTLET) | |
| TASK 20-28-00-912-802-A | Electrical Bonding - General Maintenance Procedure |
| TASK 25-55-12-400-001-A | Installation of the Aft Cargo-Compartment Partition at FR65 |
| FOR [34HN] (ISOL VALVE AFT CARGO INLET) | |
| TASK 20-28-00-912-802-A | Electrical Bonding - General Maintenance Procedure |
| TASK 25-55-11-400-003-A | Installation of the Sidewall Panels in the Aft Cargo Compartment - FR47/FR59 |
AFT Cargo Isolation ValvesSubtask 21-28-52-860-050-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) Make sure that:
(a) The aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).
(b) The AFT cargo-compartment door 826 is open (Ref. AMM TASK 52-30-00-860-001).
(c) The ACCESS PLATFORM 2M (6 FT) is in position at the AFT cargo-compartment door 826.
(d) The access panel is removed.
1 FOR [33HN] (ISOL VALVE AFT CARGO OUTLET)
(a) Make sure that:
1 The APU BLEED pushbutton switch is in the off position (the ON legend is off).
2 The ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in the off position (the OFF legends are on).
3 The warning notice is in position to tell persons not to operate these pushbutton switches.
(3) On the HP and the LP ground connectors the warning notice is in position to tell persons not to supply the ground air.
Subtask 21-28-52-860-050-C ** ON A/C NOT FOR ALL (1) Make sure that:
(a) The aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).
(b) The AFT cargo-compartment door 826 is open (Ref. AMM TASK 52-30-00-860-001).
(c) The ACCESS PLATFORM 2M (6 FT) is in position at the AFT cargo-compartment door 826.
(d) The access panel is removed.
1 FOR [33HN] (ISOL VALVE AFT CARGO OUTLET)
- 161DW.
- 151EW.
(a) Make sure that:
1 The APU BLEED pushbutton switch is in the off position (the ON legend is off).
2 The ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in the off position (the OFF legends are on).
3 The warning notice is in position to tell persons not to operate these pushbutton switches.
(3) On the HP and the LP ground connectors the warning notice is in position to tell persons not to supply the ground air.
A. Aircraft Maintenance Configuration
(1) Make sure that:
(a) The aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).
(b) The AFT cargo-compartment door 826 is open (Ref. AMM TASK 52-30-00-860-001).
(c) The ACCESS PLATFORM 2M (6 FT) is in position at the AFT cargo-compartment door 826.
(d) The access panel is removed:
1 FOR [33HN] (ISOL VALVE AFT CARGO OUTLET)
(a) Make sure that:
1 The APU BLEED pushbutton switch is in the off position (the ON legend is off).
2 The ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in the off position (the OFF legends are on).
3 The warning notice is in position to tell persons not to operate these pushbutton switches.
(3) On the HP and the LP ground connectors the warning notice is in position to tell persons not to supply the ground air.
Subtask 21-28-52-865-051-A ** ON A/C NOT FOR ALL (1) Make sure that:
(a) The aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).
(b) The AFT cargo-compartment door 826 is open (Ref. AMM TASK 52-30-00-860-001).
(c) The ACCESS PLATFORM 2M (6 FT) is in position at the AFT cargo-compartment door 826.
(d) The access panel is removed:
1 FOR [33HN] (ISOL VALVE AFT CARGO OUTLET)
- 162DW.
- 151VW.
(a) Make sure that:
1 The APU BLEED pushbutton switch is in the off position (the ON legend is off).
2 The ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in the off position (the OFF legends are on).
3 The warning notice is in position to tell persons not to operate these pushbutton switches.
(3) On the HP and the LP ground connectors the warning notice is in position to tell persons not to supply the ground air.
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
Subtask 21-28-52-865-065-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | AIR COND/AFT CARGO/VENT/CTL & MONG | 31HN | C07 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | AIR COND/AFT CARGO/VENT & HTG/CTL & MONG | 31HN | C07 |
| ** ON A/C NOT FOR ALL | |||
| 122VU | AIR COND/AFT CARGO VENT/FAN | 30HN | S22 |
C. Open, safety and tag this(these) circuit breaker(s):
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | AIR COND/AFT CARGO/VENT/CTL & MONG | 31HN | C07 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | AIR COND/AFT CARGO/VENT & HTG/CTL & MONG | 31HN | C07 |
Subtask 21-28-52-420-050-A ** ON A/C NOT FOR ALL
A. Installation of the Isolation Valve
(1) FOR [34HN] (ISOL VALVE AFT CARGO INLET)
(a) Remove the blanking plugs from the isolation valve (11), the sleeve (1), and the duct flange (2).
(b) Clean the component interfaces and the adjacent area.
(c) Make sure that the parts retained from the removed component are clean and in the correct condition.
(d) Put the isolation valve (11) in position and engage the pin (4) in the cutout in the duct flange (2).
(e) Install the clamp (3).
(f) TORQUE the clamp (3) to between 0.56 and 0.51 m.daN (49.56 and 45.13 lbf.in ).
(g) Put the clamp (12) and the sleeve (1) in position on the isolation valve (11).
(i) Put the bonding strap (9) in position and install the washer (8), the screw (7), the washer (6) and the nut (5) (Ref. AMM TASK 20-28-00-912-802).
(j) Remove the blanking caps from the disconnected electrical connectors.
(k) Make sure that all the electrical connections are clean and in the correct condition.
(l) Connect the electrical connector (10).
(2) FOR [33HN] (ISOL VALVE AFT CARGO OUTLET)
(a) Remove the blanking plugs from the isolation valve (24), the sleeve (15) and the duct flange (13).
(b) Clean the component interfaces and the adjacent area.
(c) Make sure that the parts retained from the removed component are clean and in the correct condition.
(d) Put the isolation valve (24) in position and engage the pin (26) in the cutout in the duct flange (15).
(e) Put the clamp (25) in position on the isolation valve (24) and the duct flange (13).
(h) TORQUE the clamp (25) to between 0.56 and 0.51 m.daN (49.56 and 45.13 lbf.in ).
(j) Put the clamp (16) and the sleeve (15) in position on the isolation valve (24).
(l) Put the bonding strap (21) in position and install the washer (20), the screw (19), the washer (22) and the nut (23) (Ref. AMM TASK 20-28-00-912-802).
(m) Remove the blanking caps from the disconnected electrical connectors.
(n) Make sure that all the electrical connections are clean and in the correct condition.
(o) Connect the electrical connector (18).
Subtask 21-28-52-865-060-A ** ON A/C NOT FOR ALL (1) FOR [34HN] (ISOL VALVE AFT CARGO INLET)
(a) Remove the blanking plugs from the isolation valve (11), the sleeve (1), and the duct flange (2).
(b) Clean the component interfaces and the adjacent area.
(c) Make sure that the parts retained from the removed component are clean and in the correct condition.
(d) Put the isolation valve (11) in position and engage the pin (4) in the cutout in the duct flange (2).
(e) Install the clamp (3).
(f) TORQUE the clamp (3) to between 0.56 and 0.51 m.daN (49.56 and 45.13 lbf.in )
. (g) Put the clamp (12) and the sleeve (1) in position on the isolation valve (11).
NOTE: The end of the sleeve (1) must be within the coloured markings on the isolation valve (11).
(h) Tighten the clamp (12). (i) Put the bonding strap (9) in position and install the washer (8), the screw (7), the washer (6) and the nut (5) (Ref. AMM TASK 20-28-00-912-802).
(j) Remove the blanking caps from the disconnected electrical connectors.
(k) Make sure that all the electrical connections are clean and in the correct condition.
(l) Connect the electrical connector (10).
(2) FOR [33HN] (ISOL VALVE AFT CARGO OUTLET)
(a) Remove the blanking plugs from the isolation valve (24), the sleeve (15) and the duct flange (13).
(b) Clean the component interfaces and the adjacent area.
(c) Make sure that the parts retained from the removed component are clean and in the correct condition.
(d) Put the isolation valve (24) in position and engage the pin (26) in the cutout in the duct flange (15).
(e) Put the clamp (25) in position on the isolation valve (24) and the duct flange (13).
NOTE: Do not fully tighten the clamp (25) at this time.
(f) Put the clamp (17) in position on the bracket (14) and the isolation valve (24). NOTE: Do not fully tighten the clamp (17) at this time.
(g) Make sure that the clamp (25) is in the correct position. (h) TORQUE the clamp (25) to between 0.56 and 0.51 m.daN (49.56 and 45.13 lbf.in )
. NOTE: When you look in the direction of the air flow the attach device of the clamp (25) must be between the 7 o'clock and the 8 o'clock position.
(i) Tighten the clamp (17). (j) Put the clamp (16) and the sleeve (15) in position on the isolation valve (24).
NOTE: The end of the sleeve (15) must be within the coloured markings on the isolation valve (24).
(k) Tighten the clamp (16). (l) Put the bonding strap (21) in position and install the washer (20), the screw (19), the washer (22) and the nut (23) (Ref. AMM TASK 20-28-00-912-802).
(m) Remove the blanking caps from the disconnected electrical connectors.
(n) Make sure that all the electrical connections are clean and in the correct condition.
(o) Connect the electrical connector (18).
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 21-28-52-710-050-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | AIR COND/AFT CARGO/VENT/CTL & MONG | 31HN | C07 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | AIR COND/AFT CARGO/VENT & HTG/CTL & MONG | 31HN | C07 |
| ** ON A/C NOT FOR ALL | |||
| 122VU | AIR COND/AFT CARGO VENT/FAN | 30HN | S22 |
C. Do the operational test of the AFT cargo-compartment ventilation system (Ref. AMM TASK 21-28-00-710-006).
5. Close-upSubtask 21-28-52-410-050-A ** ON A/C NOT FOR ALL
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel:
(a) FOR [33HN] (ISOL VALVE AFT CARGO OUTLET)
(b) FOR [34HN] (ISOL VALVE AFT CARGO INLET)
(3) Remove the access platform(s).
(4) Close the AFT cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-002).
(5) Remove the WARNING NOTICE(S).
Subtask 21-28-52-410-050-C ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel:
(a) FOR [33HN] (ISOL VALVE AFT CARGO OUTLET)
(b) FOR [34HN] (ISOL VALVE AFT CARGO INLET)
(3) Remove the access platform(s).
(4) Close the AFT cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-002).
(5) Remove the WARNING NOTICE(S).
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel(s):
(a) FOR [33HN] (ISOL VALVE AFT CARGO OUTLET)
(b) FOR [34HN] (ISOL VALVE AFT CARGO INLET)
(4) Close the AFT cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-002).
(5) Remove the WARNING NOTICE(S).
Subtask 21-28-52-862-051-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel(s):
(a) FOR [33HN] (ISOL VALVE AFT CARGO OUTLET)
(b) FOR [34HN] (ISOL VALVE AFT CARGO INLET)
- 151VW (Ref. AMM TASK 25-55-11-400-003).
(4) Close the AFT cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-002).
(5) Remove the WARNING NOTICE(S).