Operational Test of the Cabin Recirculation Fans

TASK 21-21-00-710-001-A
Operational Test of the Cabin Recirculation Fans

FIN: 14HG
FIN: 15HG

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. 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 31-32-00-860-002-A	Procedure to Get Access to the SYSTEM REPORT/TEST/AIR COND Page

3. Job Set-up
Subtask 21-21-00-861-052-A

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

NOTE: The energization of the aircraft electrical circuits starts a full test of the pack, cockpit and cabin temperature-control systems.

Subtask 21-21-00-865-056-A

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/TEMP CTL/SYS 1 CHAN B/28VDC	52HH	D08
** 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
122VU	AIR COND/PACK TEMP/CTL SYS1/2/115VAC	21HH	W22
122VU	AIR COND/PACK TEMP/CTL SYS1/2/28VDC	23HH	W21
122VU	AIR COND/PACK TEMP/CTL SYS1/1/115VAC	1HH	X22
122VU	AIR COND/PACK TEMP/CTL SYS1/1/28VDC	3HH	X21
122VU	AIR COND/PACK TEMP CTL SYS2/2/28VDC	24HH	Y21
122VU	AIR COND/PACK TEMP CTL SYS2/2/115VAC	22HH	Y20
122VU	AIR COND/PACK TEMP CTL SYS2/1/28VDC	4HH	Y19
122VU	AIR COND/PACK TEMP CTL SYS2/1/115VAC	2HH	Y18
** ON A/C ALL
122VU	AIR COND/RECIRC FAN/R/CTL	11HG	W20
122VU	AIR COND/RECIRC FAN/R/SPLY	3HG	W18
122VU	AIR COND/RECIRC FAN/L/CTL	2HG	X20
122VU	AIR COND/RECIRC FAN/L/SPLY	1HG	X18
** ON A/C NOT FOR ALL
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 21-21-00-860-056-A

C. Aircraft Maintenance Configuration
(1) On the panel 30VU push the PACK 1 and the PACK 2 pushbutton switches to the off position (the OFF legends come on).
(2) On the panel 22VU make sure that the CAB FANS switch is in the on position (the OFF legend shows off).
(3) On one MCDU get the SYSTEM REPORT/TEST AIR COND menu page (Ref. AMM TASK 31-32-00-860-002).

4. Procedure
Subtask 21-21-00-710-052-B ** ON A/C NOT FOR ALL

A. Operational Test of the Cabin Recirculation Fans

ACTION	RESULT
1.On the AIR COND menu page:	On the MCDU:
push the line key adjacent to the TEMP CTL indication.	the CAB TEMP CONT menu page comes on.
2.On the CAB TEMP CONT menu page:
push the line key adjacent to the TEST indication.	the CAB TEMP CONT TEST page comes on. the message SELECT PACK 1 AND 2 OFF comes on
3.On the CAB TEMP CONT TEST page:
push the line key adjacent to the CONTINUE indication.	the message IN PROGRESS MAX 300 S comes on, then the messages TEST OK and END OF TEST comes on.
push the MCDU MENU key.	the MCDU MENU page comes on.
4.On the MCDU MENU page:
push the line key adjacent to the CFDS indication.	the CFDS page comes on.
5.On the CFDS page:
push the line key adjacent to the AVIONICS STATUS.	the AVIONICS STATUS page with no TEMP CTL (CLASS 3) message comes on. NOTE: Ignore the CLASS 3 failures on the CAB TEMP CONT CLASS 3 FAULTS page which are not related to the air distribution (ATA 21-21).

Subtask 21-21-00-710-052-C ** ON A/C NOT FOR ALL

A. Operational Test of the Cabin Recirculation Fans
(1) Make sure that all bleed air sources (Engine, APU and/or HP ground supply) are disconnected or shut down.

NOTE: The presence of bleed air pressure in the system could lead to test performance failure.

ACTION	RESULT
1.On the AIR COND menu page:	On the MCDU:
push the line key adjacent to the TEMP CTL indication.	the CAB TEMP CONT menu page comes on.
2.On the CAB TEMP CONT menu page:
push the line key adjacent to the TEST indication.	the CAB TEMP CONT SYSTEM TEST page comes on. the message SELECT PACK 1 AND 2 OFF comes on
3.On the CAB TEMP CONT SYSTEM TEST page:
push the line key adjacent to the START TEST indication.
4.On the CAB TEMP CONT SYSTEM TEST page:
push the line key adjacent to the CONFIRM START OF TEST indication.	the message TEST IN PROGRESS 240 S comes on, then the message TEST OK comes on.
push the MCDU MENU key.	the MCDU MENU page comes on.
5.On the MCDU MENU page:
push the line key adjacent to the CFDS indication.	the CFDS page comes on.
6.On the CFDS page:
push the line key adjacent to the AVIONICS STATUS.	the AVIONICS STATUS page with no TEMP CTL (CLASS 3) message comes on. NOTE: Ignore the CLASS 3 failures on the CAB TEMP CONT CLASS 3 FAULTS page which are not related to the air distribution (ATA 21-21).

5. Close-up
Subtask 21-21-00-860-055-A

A. Aircraft Maintenance Configuration
(1) On the panel 30VU push the PACK 1 and the PACK 2 pushbutton switches to the on position (the OFF legends go off).
(2) On the MCDU, push the line select key adjacent to the RETURN indication until the CFDS menu page comes into view.
(3) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:00:47 UTC