21-58-01
 ALL  ú ú 01F Page 407 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 TASK 21-58-01-004-035
 4.  Aft Equipment Cooling Fans Removal (Fig. 403)__________________________________
 A. References
 (1)  
AMM 25-57-04/401, Roller/Caster Trays

 (2)  
AMM 25-58-01/401, Lock/Stop Roller/Caster Trays

 (3)  
AMM 25-58-03/401, Vertical and Side Restraint/Caster Unit

 (4)  
AMM 53-21-02/401, Main and Upper Deck Floor

 (5)  
AIPC 21-58-01 Fig. 1

 (6)  
AIPC 21-58-01 Fig. 2

 (7)  
SSM 21-58-07

 (8)  
WDM 21-58-26

 B. Access
 (1)  Location Zone
 151 Area Aft of Bulk Cargo Compartment, LH

 C. Prepare for the Removal
 S 864-062
 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.
 (1)  
Remove the electrical power (AMM 24-22-00/201).

 S 864-036

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

 (a)  
Main power distribution panel, P6
 1) 6H30, AFT EQUIP COOL FAN CONT

 (b)  
P84 Panel
 1) PRI AFT EQUIP COOL FAN PWR
 2) ALT AFT EQUIP COOL FAN PWR

 (3)  
Get access to the fan thru the floor panel:

 S 014-038

 (4)  
Remove the following cargo handling equipment from the floor panel that is above the fans at STA 2310, LBL 25:

 (a)  
Roller/Caster Trays (AMM 25-57-04/401)

 (b)  
Lock/Stop Roller/Caster Trays (AMM 25-58-01/401)

 (c)  
Vertical and Side Restraint/Caster Unit (AMM 25-58-01/401)

 S 014-037
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-58-01
 ALL  ú ú 02F Page 408 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

DOOR 5 (REF)
AREA BEHIND BULK
CARGO COMPARTMENT

SEE A
DECK FLOOR MAIN 
ELECTRICAL CONNECTOR CLAMP (6 LOCATIONS) PRIMARY FAN  SLEEVE (2 LOCATIONS)  SEE A  B  FWD 
FLOW ARROW 
TUBE OUTLET 
FWD 
B AFT EQUIPMENT COOLING FANS ALTERNATE FAN (INSTALLATION SAME AS PRIMARY FAN) 
Figure 403 Equipment Cooling Fans Installation

 D02372
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-58-01
 ALL  ú ú 01F Page 409 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 014-039
 (5)  Remove the floor panel that is over the fans at STA 2310, LBL 25 (AMM 53-21-02/401)
 D. Remove the Fan
 S 034-041
 (1)  Remove the electrical connenctor from the fan:
 (a)  
Primary fan, DB8599

 (b)  
Alternate fan, DB8598

 S 034-042
 (2)  
Remove the two clamps that attach the sleeves to both ends of the fan.

 S 034-043

 (3)
Pull the sleeve away from the outboard (inlet) of the fan.

 S 034-044

 (4)  
Pull the sleeve with the air outlet tube from the inboard (outlet) of the fan.

 S 034-045

 (5)  
Remove the two clamps that attach the fan to the airplane structure.

 S 024-046

 (6)  
Remove the fan.

 (7)  
Put a cover over the duct opening.

 S 434-047
 TASK 21-58-01-404-048
 5.  Aft Equipment Cooling Fans Installation (Fig. 403)_______________________________________
 A. References
 (1)  AMM 24-22-00/201, Manual Control
　
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