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747-400 MAINTENANCE MANUAL
CLAMP (4 LOCATIONS
CHECK VALVE
DUCT SLEEVE (2 LOCATIONS)
FWD
SUPPLY FAN
SUPPLY FAN CHECK VALVE
CLAMP (4 LOCATIONS)
DUCT SLEEVE FWD (2 LOCATIONS) CHECK VALVE INBD
EXHAUST FAN CHECK VALVE
Equipment Cooling Fan Check Valve Installation
Figure 401

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747-400
MAINTENANCE MANUAL

 (b)  Remove the water drain line which is inboard of the check valve.
 D. Remove the check valve
 S 034-004
 (1)  
Remove the clamp on each end of the check valve.

 S 034-005

 (2)  
Move the duct sleeves away from the check valve.

 S 024-018

 (3)  
Remove the check valve.

 S 034-006

 (4)  
Put a cover on the duct openings.

 TASK 21-58-03-404-007
 3. Fan Check Valve Installation (Fig. 401)
____________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

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

 (3)  
AIPC 21-43-52 Fig. 2

 (4)  
AIPC 21-58-03 Fig. 1

 B. Access
 (1)  Location Zone 121 Forward Cargo Compartment Forward Half, RH 122 Forward Cargo Compartment Forward Half, LH
 C. Install the Check Valve
 S 434-008
 (1)  Remove the covers from the duct openings.
 (a)  Make sure there is no unwanted material in the ducts.
 S 424-009
 (2)  Put the check valve in its position in the duct.
 (a)  Make sure the flapper shaft is in the vertical position.
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747-400 MAINTENANCE MANUAL
 (b)  
On the check valve for the supply fan, make sure the flow arrow points in the forward direction.

 (c)  
On the check valve for the exhaust valve, make sure the flow arrow points in the aft direction.

 S 434-010
 (3)  Install a clamp on each end of the check valve.
 D. Do the Installation Test for the Check Valves
 S 864-011
 (1)  
Make sure the EQUIP COOLING selector, on the overhead panel, P5, is in the NORM position.

 S 864-012

 (2)  
Supply electrical power (AMM 24-22-00/201).

 S 714-019

 (3)  
Make sure the fans come on.

 S 794-013

 (4)  
Feel for leaks around the check valve.

 (a)  
Small leaks are permitted.

 (b)  
You must repair a large leak.

 E. Put the Airplane to Its Usual Condition
 S 414-020
 (1)  If the check valve for the supply fan was installed,
 do the steps that follow:

 (a)  
Install the water drain line that is inboard of the check valve.

 (b)  
Install the left sidewall lining in the forward cargo compartment (AMM 25-52-01/401).

 S 864-015
 (2)  Remove the electrical power, if it is not necessary
 (AMM 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 CHECK VALVES - INSPECTION/CHECK
　
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