(b)  
Overhead Circuit Breaker Panel, P180 1) 180E11, CARGO VENT AFT CONT

 S 014-034
 (3)  Remove the sidewall lining from the area immediately forward of the flapper valve screen in the aft left corner of the bulk cargo compartment (AMM 25-55-02/401).
 D.  Remove the Fan
 S 034-035
 (1)  
Remove the electrical connector, DB8291, from the fan.

 (2)  
Remove the clamps from each end of the fan.

 (3)  
Pull the flex duct from the forward end of the fan.

 S 034-036
 S 034-037
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A

747-400
MAINTENANCE MANUAL

BOLT, WASHERS, NUT (2 LOCATIONS)
INLET SCREEN/CHECK VALVE ASSEMBLYBULK CARGO FAN
SEE A
FAN
ELECTRICAL CONNECTOR CLAMP (2 LOCATIONS)
SLEEVE
BOLT, WASHERS, NUT (2 LOCATIONS)
BULK CARGO FAN
A

Bulk Cargo Fan - Installation
Figure 401

FWD
INBD
C77171
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A
747-400 MAINTENANCE MANUAL
 S 034-060
 (4)  
Pull the rubber sleeve and the inlet screen/check valve assembly from the aft end of the fan.

 S 034-038

 (5)  
Remove the nuts, bolts, and washers from the lug at the top of the fan.

 S 034-039

 (6)  
Remove the nuts, bolts, and washers from the lug at the bottom of the fan.

 S 014-040

 (7)  
Remove the fan.

 S 434-041

 (8)  
Put a cover over the duct opening.

 TASK 21-26-08-404-043
 3.  Bulk Cargo Fan Installation (Fig. 401)___________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 25-55-02/401, Bulk Compartment Ceiling and Sidewall Lining

 (3)  
IPC 21-40-51 Fig. 1

 (4)  
WDM 21-27-22

 (5)  
SSM 21-27-03

 B. Access
 (1)  Location Zone
 145 Bulk Cargo Compartment, LH

 C. Install the Fan
 S 034-043
 (1)  Remove the cover from the duct opening.
 (a) Make sure there is no unwanted material in the duct.
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A
747-400 MAINTENANCE MANUAL
 S 984-044
 (2)  
Hold the fan in position with the flow arrow pointed forward and install the bolts, nuts and washers on the lug at the bottom of the fan.

 S 434-045

 (3)  
Install the nuts, bolts, and washers on the lug at the top of the fan.

 S 434-046

 (4)  
Install the inlet screen/check valve assembly with the sleeve on the aft end of the fan.

 S 434-047

 (5)  
Pull the flex duct onto the forward end of the fan.

 S 434-048

 (6)  
Install the clamps on both ends of the fan.

 S 434-049

 (7)  
Install the electrical connector, DB8291, onto the fan.

 S 864-050

 (8)  
Remove the DO-NOT-CLOSE identifiers and close these circuit
 breakers:

 (a)  
Right Power Distribution Center, P415
 1) 415H38, VENT FAN PWR BULK CARGO

 (b)  
Overhead Circuit Breaker Panel, P180
 1) 180E11, CARGO VENT AFT CONT