Functional Test of the AFT Cargo-Compartment Ventilation-System

TASK 21-28-00-720-004-A
Functional Test of the AFT Cargo-Compartment Ventilation-System

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)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
162DW
151EW
151VW

C. Referenced Information

REFERENCE	DESIGNATION
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 25-55-11-000-003-A	Removal of the Sidewall Panels in the Aft Cargo Compartment - FR47/FR59
TASK 25-55-11-400-003-A	Installation of the Sidewall Panels in the Aft Cargo Compartment - FR47/FR59
TASK 25-55-12-000-001-A	Removal of the Aft Cargo-Compartment Partition at FR65
TASK 25-55-12-400-001-A	Installation of the Aft Cargo-Compartment Partition at FR65
TASK 26-16-00-710-003-A	Operational Check of Cargo Compartment Smoke Detection by CFDS to Confirm Isolation Valves Latching Circuit Integrity.
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
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

3. Job Set-up
Subtask 21-28-00-861-067-A ** ON A/C NOT FOR ALL

A. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 21-28-00-865-069-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) closed:

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/ZONE TEMP CTL/28VDC/SYS2	4HK	V20
122VU	AIR COND/ZONE TEMP CTL/28VDC/SYS1	3HK	V19
122VU	AIR COND/ZONE TEMP CTL/115VAC/SYS2	2HK	V18
122VU	AIR COND/ZONE TEMP CTL/115VAC/SYS1	1HK	V17
** ON A/C NOT FOR ALL
122VU	AIR COND/AFT CARGO VENT/FAN	30HN	S22

Subtask 21-28-00-865-089-A ** ON A/C NOT FOR ALL

C. Make sure that this(these) circuit breaker(s) is(are) closed:

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 21-28-00-010-062-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the AFT cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-001).
(2) Put the ACCESS PLATFORM 2M (6 FT) at the AFT cargo-compartment door 826.
(3) Remove the access panel 162DW (Ref. AMM TASK 25-55-12-000-001).
(4) Remove the access panel 151EW (Ref. AMM TASK 25-55-11-000-003).

Subtask 21-28-00-010-062-B ** ON A/C NOT FOR ALL

Subtask 21-28-00-860-061-B ** ON A/C NOT FOR ALL

E. Aircraft Maintenance Configuration
(1) On the overhead panel 22VU, make sure that the white OFF light in the AFT ISOL VALVE pushbutton switch is on.
(2) Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) Make sure that the ENGINE/WARNING page shows on the ECAM upper display unit.
(4) Make sure that the COND page shows on the ECAM lower display unit.

4. Procedure
Subtask 21-28-00-720-055-B ** ON A/C NOT FOR ALL

A. Functional Test of the Aft Cargo-Compartment Ventilation -System

NOTE: During the test you must visually monitor the inlet and the outlet isolation valves for the correct movement sequence.

ACTION	RESULT
1.On the panel 22VU: push the AFT ISOL VALVE pushbutton switch.	On the panel 22VU: the white OFF light in the AFT ISOL VALVE pushbutton switch goes off.
	On the ECAM lower display unit: the inlet and outlet isolation valve symbols open and change to green.
	In the AFT cargo compartment: the inlet and outlet isolation valves open. the extraction fan operates after approx. 15 s.
2.On the outlet isolation valve 33HN: disconnect the electrical connector.	On the ECAM upper display unit: the message AFT CRG ISOL VALVE comes on after approx. 40 s.
	On the panel 22VU: the amber FAULT light in the AFT ISOL VALVE pushbutton switch comes on.
	In the AFT cargo compartment: the extraction fan stops.
3.On the panel 22VU: push the AFT ISOL VALVE pushbutton switch.	On the panel 22VU: the white OFF light in the AFT ISOL VALVE pushbutton switch comes on and the amber FAULT light goes off but comes on again after approx. 30 s.
	On the ECAM lower display unit: the inlet isolation valve symbol closes and changes to amber. the outlet isolation valve symbol stays open.
	On the ECAM control panel 11VU: the white light in the two CLR pushbutton switches come on.
	In the AFT cargo compartment: the inlet isolation valve closes. the outlet isolation valve stays open.
4.On the outlet isolation valve 33HN: connect the electrical connector.	On the panel 22VU: the amber FAULT light in the AFT ISOL VALVE pushbutton switch goes off.
	On the ECAM lower display unit: the outlet isolation valve symbol closes and changes to amber.
	On the ECAM upper display unit: the message AFT CRG ISOL VALVE goes off.
	In the AFT cargo compartment: the outlet isolation valve closes.
5.On the panel 22VU: push the AFT ISOL VALVE pushbutton switch.	On the panel 22VU: the white OFF light in the AFT ISOL VALVE pushbutton switch goes off.
	On the ECAM lower display unit: the inlet and outlet isolation valve symbols open and change to green.
	In the AFT cargo compartment: the inlet and outlet isolation valves open. the extraction fan operates after approx. 15 s.
6.On the panel 22VU: push the AFT ISOL VALVE pushbutton switch.	On the panel 22VU: the white OFF light in the AFT ISOL VALVE pushbutton switch comes on.
	On the ECAM lower display unit: the inlet and outlet isolation valve symbols close and change to amber.
	In the AFT cargo compartment: the inlet and outlet isolation valves close. the extraction fan stops.
7.On the ECAM control panel 11VU: push one of the two CLR pushbutton switches.	On the ECAM control panel 11VU: the white light in the two CLR pushbutton switches go off.
	On the ECAM lower display unit: the STATUS page comes on.

Subtask 21-28-00-710-061-A ** ON A/C NOT FOR ALL

B. Do the operational test of the AFT cargo-compartment smoke-detection with the CFDS to confirm isolation valve latching circuit integrity. (Ref. AMM TASK 26-16-00-710-003).

5. Close-up
Subtask 21-28-00-860-062-A ** ON A/C NOT FOR ALL

A. Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).

Subtask 21-28-00-410-063-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel 162DW (Ref. AMM TASK 25-55-12-400-001).
(3) Install the access panel 151EW (Ref. AMM TASK 25-55-11-400-003).
(4) Remove the access platform(s).
(5) Close the AFT cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-002).

Subtask 21-28-00-410-063-C ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel 162DW (Ref. AMM TASK 25-55-12-400-001).
(3) Install the access panel 151VW (Ref. AMM TASK 25-55-11-400-003).
(4) Remove the access platform(s).
(5) Close the AFT cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-002).

Subtask 21-28-00-862-063-A ** ON A/C NOT FOR ALL

C. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002)

[Rev.10 from 2021] 2026.03.31 23:04:00 UTC