Functional Test of the Brake Fans

TASK 32-48-00-720-001-A
Functional Test of the Brake Fans

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)

B. 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)

3. Job Set-up
Subtask 32-48-00-860-055-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the panel 402VU, make sure that the BRK FAN CONTROL pushbutton switch is released.
(2) Energize the aircraft electrical circuits. (Ref. AMM TASK 24-41-00-861-002)

Subtask 32-48-00-941-053-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Put the WARNING NOTICE(S) in position to tell persons that the cooling fans will operate.
(2) Make sure that the area adjacent to the brake fans is clear of equipment.

Subtask 32-48-00-865-056-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	LIGHTING/XFMR/115V.5V/ESS BUS	29LP	H03
** ON A/C NOT FOR ALL
49VU	LIGHTING/XFMR/115V.5V/ESS BUS	29LP	H01
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/BRK FAN/WHEELS/3 AND 4	2GS	L35
121VU	HYDRAULIC/BRK FAN/WHEELS/1 AND 2	1GS	L32
121VU	HYDRAULIC/BRK/FAN/CTL	3GS	M32
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
122VU	LIGHTING/TST/BOARD/SPLY	30LP	X06
122VU	LIGHTING/ANN LT SPLY/XFMR/BUS 2	27LP	X05
122VU	LIGHTING/ANN LT SPLY/XFMR/BUS 1	26LP	X04
122VU	LIGHTING/ANN LT SPLY/XFMR/STAT INV	28LP	X03

4. Procedure
Subtask 32-48-00-720-050-A ** ON A/C NOT FOR ALL

A. Test of the brake fans

ACTION	RESULT
1.On the panel 402VU, push the BRK FAN CONTROL pushbutton switch.	The ON legend comes on. The brake cooling fans operate. The air is drawn through the brake units.
2.On the panel 402VU, release the BRK FAN CONTROL pushbutton switch.	The ON legend goes off. The fans of the wheels stop.

Subtask 32-48-00-860-056-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) De-energize the aircraft electrical circuits. (Ref. AMM TASK 24-41-00-862-002)

5. Close-up
Subtask 32-48-00-942-053-A ** ON A/C NOT FOR ALL

A. Removal of Equipment
(1) Remove the warning notice(s)
(2) Make sure that the work area is clean and clear of tools and other items.

[Rev.10 from 2021] 2026.04.01 00:50:33 UTC