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747-400 MAINTENANCE MANUAL
 S 434-046
 (3)  
Instal the nuts, bolts, and washers on the lug at the aft end of the fan.

 S 434-047

 (4)  
Install the nuts, bolts, and washers on the lug at the forward end of the fan.

 S 434-031

 (5)  
Pull the flex duct over the outboard end of the fan.

 S 434-050

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

 S 434-051

 (7)  
Install the clamps on both ends of the fan.

 S 434-032

 (8)  
Install the electrical connector on the fan:

 (a)  
DB8643 (Forward Fan)

 (b)  
DB8642 (Aft Fan)

 S 864-034
 (9)  Remove the DO-NOT-CLOSE identifiers and close these circuit
 breakers:

 (a)  
Overhead Circuit Breaker Panel, P180 1) 180H2, LWR FWD CARGO VENT FAN PWR 1 (Forward Fan) 2) 180H5, LWR FWD CARGO VENT FAN PWR 2 (Aft Fan)

 (b)  
Left Power Distribution Center, P414
 1) 414E10, CARGO VENT FWD CONT

 D. Do the Installation Test for the Fan
 S 864-035
 (1)  
Supply electrical power (AMM 24-22-00/201).

 (2)  
Make sure the forward cargo door is fully open.

 S 864-055

 (3)  
Make sure the cargo air conditioning flow control switch on the overhead P461 panel is set to OFF.

 S 864-053
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-26-10
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747-400 MAINTENANCE MANUAL
 (4)  S 864-056Open, then close this circuit breaker on the main power distribution panel, P6: (a) E34, A/C CONT CARGO - PCA
 (5)  S 864-057Put the FORWARD CARGO VENT switch on the P86 panel above the cargo door to ON.
 (6)  S 714-058Make sure the fan operates. (a) Make sure air comes from the ceiling outlets.
 (7)  S 794-059Examine the fan to duct connections for air leaks. (a) Light leakage is permitted. (b) If the leakage is strong, align the joints and tighten the clamps.
 (8)  S 864-060Put the FORWARD CARGO VENT switch to OFF.
 (9)  S 434-039Install the ceiling lining (AMM 25-52-01/401).
 S 864-062

 (10)
 Close the forward cargo door.

 S 864-040

 (11)
 Remove the electrical power if it is not necessary (AMM 24-22-00/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-26-10
 ALL  ú ú 01F Page 405 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 AFT CARGO VENTILATION FAN - REMOVAL/INSTALLATION
________________________________________________
 1.  General
_______
 A.  The aft cargo vent fan is installed on the right-hand side of the aft containerized area at station 1740.
 B.  To get access to the fan you must remove the compartment sidewall lining.
 TASK 21-26-12-004-001
 2.  Aft Cargo Ventilation Fan Removal (Fig. 401)
_________________________________
 A.  References
 (1)  
AMM 25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings

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

 (3)  
IPC 21-28-51 Fig. 1

 (4)  
WDM 21-27-21

 (5)  
SSM 21-27-02

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

 C.  Prepare for the Removal
 S 864-030
 (1)  
Make sure that the AFT CARGO VENT switch on the P59 panel just forward of the cargo door is set to OFF.
　
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