(t)  
Make sure that both fans operate.

 E. Put the Airplane Back to its Usual Condition
 S 865-075
 (1)  
Put the pack 3 switch to OFF.

 S 865-076

 (2)  
Put the LOWER LOBE CARGO COND AIR FLOW RATE selector on the P461 panel to OFF.

 S 865-077

 (3)  
Do the "Put the Air/Ground Relay System Back in the Ground Mode" task (AMM 32-09-02/201).

 (4)  
Put the forward cargo VENT FANS switch to OFF.

 S 865-078
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747-400 MAINTENANCE MANUAL
 S 415-079
 (5)  
Close the forward cargo door.

 S 415-080

 (6)
Close the air conditioning bay access door (AMM 06-09-02/201).

 S 865-081

 (7)  
Remove the electrical power if it is not necessary (AMM 24-22-00/201).

 TASK 21-26-00-705-082
 6.  Lower Aft and Bulk Cargo Ventilation Fans - System Test_______________________________________________________
 A. References
 (1)  
AMM 06-09-03/201, Body Section 44 Access Doors and Panels

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 32-09-02/201, Air/Ground Relay System

 B. Access
 (1)  
Location Zones
 133 Air Conditioning Equipment Bay, RH
 140 Body STA 1480 to STA 2160 (Lower Lobe)
 150 Body STA 2160 to STA 2360 (Lower Lobe)

 (2)  
Access Panel
 191N-L Air Conditioning Access Door

 C. Prepare for The Test
 S 865-083
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-084

 (2)  
Put the LOWER LOBE CARGO COND AIR FLOW RATE selector on the P461 panel in the OFF position.

 S 865-085

 (3)  
Make sure the VENT FANS switch in the aft cargo compartment in the P59 panel is in the OFF position.

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 S 865-086
 (4)  Open, then close this circuit breaker on the main power
 distribution, panel, P6:

 (a)  6E34, A/C CONT CARGO - PCA
 S 015-087
 (5)  
Open the access door for the left air conditioning bay to get access to pack 2 (AMM 06-09-03/201).

 S 865-088

 (6)  
Open the aft cargo or the bulk cargo compartment doors.

 D. Do the Test of the Aft and Bulk Cargo Ventilation Fans
 S 735-089
 (1)  Do these steps to check the operation of the forward cargo fans and their interfaces:
 (a)  
Make sure that both fans (aft and bulk cargo) do not operate.

 (b)  
Put the VENT FANS switch on the P59 panel in the aft cargo compartment to the ON position.

 (c)  
Make sure that both fans operate.

 NOTE: To check for fan operation make sure there is airflow
____ out of the air exits or look at the ECS Maintenance Page for Air Conditioning to see if the fans are ON or OFF.
 (d)  
Close the aft and bulk cargo doors.

 (e)  
Make sure that both fans do not operate.

 (f)  
Open the aft or the bulk cargo doors.

 (g)  
Make sure both fans operate.

 WARNING: MAKE SURE THE CIRCUIT BREAKER IN THE SUBSEQUENT STEP IS
_______ OPENED. IF IT IS NOT OPENED, THE FIRE EXTINGUISHER BOTTLES COULD RELEASE THEIR CONTENTS AND CAUSE INJURY TO PERSONNEL.
 (h)  
Open this circuit breaker on the main power distribution panel, P6, and attach a DO-NOT-CLOSE tag: 1) 6H6, FIRE EXTINGUISHER LOWER CARGO

 (i)  
Put the AFT cargo fire switch on the P5 panel to ARMED.

 (j)  
　
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