(c)  
Get access to the center equipment center for the E6/E9 racks.

 1)  Make an inspection of the ducts that go to the E6 and E9 racks.
 S 216-014
 (3)  Inspect these ducts on the flight deck:
 (a)  Get access to the flight deck. 1) Open the P6 panels and overhead panels. 2) Make sure that you can feel movement of air at the end of
 the ducts.
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MAINTENANCE MANUAL

P6 SUPPLY  EXHAUST STAND CONTROL  SUPPLY STAND CONTROL  E9 SUPPLYDUCTS EXHAUST COMPARTMENT FORWARD CARGO 
SUPPLY PANEL CONTROL  P180  EXHAUST E1/E2  EXHAUST P414 P614 P514  SUPPLY E6 
EXHAUST E30 
P415 EXHAUST P615 EXHAUST SUPPLY E30  P515 EXHAUST 
SUPPLY E1/E2 

Equipment Cooling System Ducts
Figure 601

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 3) Close the overhead and P6 panels.
 S 216-013
 (4)  Inspect these ducts in the passenger cabin:
 (a)  Get access to the area between the 6th and 11th passenger windows (right side). 1) Inspect the ducts which connect the equipment cooling
 center to the flight deck.
 E. Put the Airplane Back to Its Usual Condition
 S 416-005
 (1)  
Install all sidewall panels that you removed to get access to the equipment cooling ducts (AMM 25-52-01/401 and AMM 25-21-01/401).

 S 416-006

 (2)  
Install the ball-transfer panels that you removed in the forward cargo compartment (AMM 25-53-15/401).

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747-400 MAINTENANCE MANUAL
 EQUIPMENT COOLING FANS - REMOVAL/INSTALLATION
_____________________________________________
 1.  General_______
 A.  This procedure has instructions to remove and install the supply and exhaust fans for the forward equipment cooling system and the primary and alternate exhaust fans for the aft equipment cooling system.
 B.  The supply fan for the forward equipment cooling system is installed in the left sidewall of the forward cargo compartment at STA 560.
 C.  The exhaust fan for the forward equipment cooling system is installed in the right sidewall of the forward cargo compartment at STA 520.
 D.  The primary and alternate exhaust fans for the aft equipment cooling system are in the area aft of the bulk cargo compartment on the left side just under the main deck floor at STA 2310.
 TASK 21-58-01-004-001
 2.  Forward Equipment Cooling Fan Removal (Fig. 401 and 402)_____________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings

 (3)  
AIPC 21-58-01 Fig. 1

 (4)  
AIPC 21-58-01 Fig. 2

 (5)  
WDM 21-58-21, 21-58-23

 (6)  
SSM 21-58-04, 21-58-05

 B.  Access
 (1)  Location Zone 121 Forward Cargo Compartment Forward Half, LH 122 Forward Cargo Compartment Forward Half, RH
 C.  Prepare for the Removal
 S 864-002
 CAUTION: DO NOT OPERATE THE ELECTRICAL/ELECTRONIC EQUIPMENT DURING THIS
_______ PROCEDURE. IF YOU OPERATE THE ELECTRICAL EQUIPMENT WHEN THE EQUIPMENT COOLING SYSTEM IS OFF, YOU COULD CAUSE THE ELECTRICAL EQUIPMENT TO BECOME TOO HOT.
　
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