4.
 Close the circuit breakers 1GS and make sure that the circuit breaker 2GS and 3GS are closed. On the panel 402VU, push the BRK FAN CONTROL pushbutton switch.

 5.
 On the panel 121VU, open the circuit breaker 3GS.

On this pushbutton switch, the ONlegend comes on. On the wheels 1 and 2of the left main landing gear, makesure that the fans operate correctly. Make sure that the air flows in the correct direction. (from in the wheel to out of the wheel).
On this pushbutton switch, the ONlegend goes off. The fans of the wheels1 and 2 stop.
You must get the same results asparagraphs 1 and 2, for wheels 3 and 4only.
On this pushbutton switch, the ONlegend comes on. Make sure that thefans on the four wheels operatecorrectly.
The fans on the four wheels stop.
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 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
6.
 On the panel 121VU, close the  On the four wheels, the fans operate. circuit breaker 3GS.

 7.
 On the panel 121VU, open the  Make sure that the four fans stop. circuit breaker 2GA to do the simulation of the landing gear not downlocked.

 8.
 On the panel 121VU, close the  Make sure that the fans operate. circuit breaker 2GA.

 9.
 On the panel 402VU, release the  On this pushbutton switch, the ON BRK FAN CONTROL pushbutton legend goes off. On the four wheels, switch. the fans stop.

 Subtask 32-48-00-860-051
 C. Aircraft Maintenance Configuration
 (1)
 After you close the LGCIU circuit breakers, put the aircraft back to the correct (ground) condition (Ref. TASK 32-00-00-860-002).

 (2)
 De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).

 5. Close-up
________
 Subtask 32-48-00-942-052
 A. Removal of Equipment
 (1) Make sure that the work area is clean and clear of tool(s) and other items.
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 TASK 32-48-00-720-001 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  warning notice(s)
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002  Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power
 3. Job Set-up
__________ Subtask 32-48-00-860-055
 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. TASK 24-41-00-861-002)

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 Subtask 32-48-00-941-053
 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
 C. Make sure that this(these) circuit breaker(s) is(are) closed:
R  -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU LIGHTING/XFMR/115V.5V/ESS BUS 29LP H03 
R  **ON A/C 051-099, 301-399, 
R R R  121VU HYDRAULIC/BRK FAN/WHEELS/3 AND 4 121VU HYDRAULIC/BRK FAN/WHEELS/1 AND 2 121VU HYDRAULIC/BRK/FAN/CTL  2GS 1GS 3GS  L35 L32 M32 
R  **ON A/C 051-099, 301-399, 401-499, 
R R R R R  121VU HYDRAULIC/LGCIU/SYS2 122VU LIGHTING/TST/BOARD/SPLY 122VU LIGHTING/ANN LT SPLY/XFMR/BUS 2 122VU LIGHTING/ANN LT SPLY/XFMR/BUS 1 122VU LIGHTING/ANN LT SPLY/XFMR/STAT INV  2GA 30LP 27LP 26LP 28LP  Q35 X06 X05 X04 X03 

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