S 864-031

 (2)
Open these circuit breakers and attach DO-NOT-CLOSE identifiers:

 (a)  
Right Power Distribution Center, P415 1) 415H35, VENT FAN PWR LWR AFT CARGO

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

 S 014-032
 (3)  
Remove the sidewall lining from the right side of the aft cargo compartment at station 1750 to get access to the fan. (AMM 25-52-01/401 or AMM 25-55-02/401).

 (4)  
Remove the electrical connector, DB8290, from the fan.

 (5)  
Remove the fan inlet clamp.

 S 034-033
 S 034-034
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A

747-400
MAINTENANCE MANUAL

AFT CARGO VENTILATION FAN
SEE A
ELECTRICAL
CONNECTOR

SLEEVE 
NUT, BOLT, WASHERS  (2 LOCATIONS) 
(2 LOCATIONS) 

INLET
CLAMP SCREEN/CHECK
(2 LOCATIONS) VALVE ASSEMBLY
FAN
FAN NUT, BOLT, WASHERSINLET (2 LOCATIONS)CLAMP FWD
AFT CARGO VENTILATION FAN
A
Aft Cargo Ventilation Fan - Installation Figure 401
C77183
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A
747-400
MAINTENANCE MANUAL

 S 034-036
 (6)  
Remove the clamps from the rubber sleeves on each end of the fan.

 S 034-058

 (7)  
Remove the inlet screen/check valve assembly with the rubber sleeve from the aft end of the fan.

 S 034-059

 (8)  
Pull the rubber sleeve from the forward end of the fan.

 S 034-037

 (9)  
Remove the nuts, bolts, and washers from the lug on the top of the fan.

 S 034-038

 (10)
 Remove the nuts, bolts, and washers from the lug at the bottom of the fan.

 S 024-035

 (11)
 Remove the fan.

 (a)  Put a cover on the duct opening.
 TASK 21-26-12-404-039
 3. Aft Cargo Ventilation Fan Installation (Fig. 401)
______________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

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

 (3)  
AMM 25-55-02/401, Bulk Compartment Ceiling and Sidewall Lining

 (4)  
IPC 21-28-51 Fig. 1

 (5)  
WDM 21-27-21

 (6)  
SSM 21-27-02

 B. Access
 (1)  Location Zone
 142 Aft Lower Lobe Compartment, RH

 C. Procedure
 S 034-040
 (1)  
Remove the cover from the duct opening.

 (a)  Make sure there is no unwanted material in the duct.

 (2)  
Put the fan in its position with the flow arrow pointed forward.

 S 984-041
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747-400 MAINTENANCE MANUAL
 S 434-063
 (3)  
Install the nuts, bolts, and washers on the lug on the top of the fan.

 S 434-064

 (4)  
Install the nuts, bolts, and washers on the lug on the bottom of the fan.

 S 434-042

 (5)  
Pull the rubber sleeve over the forward end of the fan.

 S 434-044

 (6)  
Put the inlet screen/check valve assembly with the rubber sleeve in its position and install the fan inlet clamp.
　
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