Functional Test of the FWD Cargo-Compartment Ventilation-System

TASK 21-28-00-720-003-A
Functional Test of the FWD 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
131QW, 132KW, 825

C. Referenced Information

REFERENCE	DESIGNATION
TASK 21-28-00-710-004-A	Operational Test of the FWD Cargo-Compartment Outlet Isolation-Valve in the Ditching Configuration
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 25-54-12-000-003-A	Removal of the Sidewall Panels in the Forward Cargo Compartment
TASK 25-54-12-400-003-A	Installation of the Sidewall Panels in the Forward Cargo Compartment
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 21-28-00-861-066-A ** ON A/C NOT FOR ALL

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

Subtask 21-28-00-865-068-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/FWD CARGO/VENT/CTL & MONG	2HN	C08
49VU	AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC	52HH	D08
122VU	FWD CARGO VENT AND HTG/FAN	1HN	T22
122VU	AIR COND/TEMP CTL SYS 2/CHAN A/115VAC	53HH	W22
122VU	AIR COND/TEMP CTL SYS 2/CHAN A/28VDC	55HH	W21
122VU	AIR COND/TEMP CTL SYS 1/CHAN A/115VAC	49HH	X22
122VU	AIR COND/TEMP CTL SYS 1/CHAN A/28VDC	51HH	X21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/28VDC	56HH	Y21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/115VAC	54HH	Y20
122VU	AIR COND/TEMP CTL SYS 1/CHAN B/115VAC	50HH	Y18

Subtask 21-28-00-010-061-B ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the FWD cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-001).
(2) Put the ACCESS PLATFORM 2M (6 FT) in position at the FWD cargo-compartment door 825.
(3) Remove the access panels 132KW and 131QW (Ref. AMM TASK 25-54-12-000-003).

Subtask 21-28-00-860-059-A ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration
(1) On the overhead panel 22VU make sure that the FWD ISOL VALVE pushbutton switch is in the off position (the OFF legend 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. Procedure
Subtask 21-28-00-720-054-A ** ON A/C NOT FOR ALL

A. Functional Test of the FWD 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 FWD ISOL VALVE pushbutton switch to the on position.	On the panel 22VU: the OFF legend (white) in the FWD ISOL VALVE pushbutton switch goes off.
	In the FWD cargo compartment: the inlet and outlet isolation valves open. the extraction fan operates after approx. 15 s.
2.On the outlet isolation valve 4HN: disconnect the electrical connector.	On the ECAM upper display unit: the message FWD CRG ISOL VALVE comes on.
	On the panel 22VU: the FAULT legend (amber) in the FWD ISOL VALVE pushbutton switch comes on.
	In the FWD cargo compartment: the extraction fan stops.
3.On the panel 22VU: push the FWD ISOL VALVE pushbutton switch to the off position.	On the panel 22VU: the OFF legend (white) in the FWD ISOL VALVE pushbutton switch comes on and the FAULT legend (amber) goes off but comes on again after approx. 30s.
	In the FWD cargo compartment: the inlet isolation valve closes. the outlet isolation valve stays open.
4.On the outlet isolation valve 4HN: connect the electrical connector.	On the panel 22VU: the FAULT legend (amber) in the FWD ISOL VALVE pushbutton switch goes off.
	On the ECAM upper display unit: the message FWD CRG ISOL VALVE goes off.
	In the FWD cargo compartment: the outlet isolation valve closes.
5.On the panel 22VU: push the FWD ISOL VALVE pushbutton switch to the on position.	On the panel 22VU: the OFF legend (white) in the FWD ISOL VALVE pushbutton switch goes off.
	In the FWD cargo compartment: the inlet and outlet isolation valves open. the extraction fan operates after approx. 15s.
6.On the panel 22VU: push the FWD ISOL VALVE pushbutton switch to the off position.	On the panel 22VU: the OFF legend (white) in the FWD ISOL VALVE pushbutton switch comes on.
	In the FWD cargo compartment: the inlet and outlet isolation valves close. the extraction fan stops.

Subtask 21-28-00-710-060-A ** ON A/C NOT FOR ALL

B. Operational Tests
(1) Do the operational test of the FWD cargo-compartment smoke-detection with the CFDS to confirm isolation valve latching circuit integrity. (Ref. AMM TASK 26-16-00-710-003).
(2) Do the operational test of the FWD cargo-compartment outlet isolation-valve in the ditching configuration (Ref. AMM TASK 21-28-00-710-004).

5. Close-up
Subtask 21-28-00-860-060-A ** ON A/C NOT FOR ALL

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

Subtask 21-28-00-410-062-B ** 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 panels 132KW and 131QW (Ref. AMM TASK 25-54-12-400-003).
(3) Remove the access platform(s).
(4) Close the FWD cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-002).

Subtask 21-28-00-862-062-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 23:03:59 UTC