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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (2)  
AMM 25-57-04/401, Roller/Caster Trays

 (3)  
AMM 25-58-01/401, Lock/Stop Roller/Caster Trays

 (4)  
AMM 25-58-03/401, Vertical and Side Restraint/Caster Unit

 (5)  
AMM 53-21-02/401, Main and Upper Deck Floor

 (6)  
AIPC 21-58-01 Fig. 1

 (7)  
AIPC 21-58-01 Fig. 2

 (8)  
SSM 21-58-07

 (9)  
WDM 21-58-26

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

 C. Procedure
 S 034-049
 (1)  
Remove the covers from the duct openings.

 S 424-050

 (2)  
Put the fan in its position.

 (a)  Make sure the flow arrow points in the inboard direction.
 S 434-051
 (3)  
Install the two clamps that attach the fan to the airplane structure.

 S 434-052

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

 S 434-053

 (5)  
Pull the sleeve onto the outboard (inlet) side of the fan.

 S 434-054

 (6)  
Install the two clamps that attach the sleeves to both ends of the fan.

 S 434-055

 (7)  
Install the electrical connector to the fan.

 (a)  
Primary fan, DB8599

 (b)  
Alternate fan, DB8598

 S 864-056
 (8)  Remove the "DO-NOT-CLOSE" identifiers and close these circuit breakers:
 (a)  Main power distribution panel, P6
 1) 6H30, AFT EQUIP COOL FAN CONT

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747-400 MAINTENANCE MANUAL
 (b)  P84 Panel
 1) PRI AFT EQUIP COOL FAN PWR
 2) ALT AFT EQUIP COOL FAN PWR

 D. Do a Check of the Fan Installation
 S 864-057
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 714-058

 (2)  
Do these steps for the primary fan:

 (a)  
Make sure the fan operates.

 (b)  
Make sure there are no large leaks in the fan to duct connections.

 S 714-059
 (3)  Do these steps for the alternate fan:
 (a)  
Open this circuit breaker on the P84 panel:
 1) PRI AFT EQUIP COOL FAN PWR

 (b)  
Make sure that within 15 seconds the alternate aft fan operates.

 NOTE: Ther primary fan will stop.
____
 (c)  
Make sure there are no large leaks in the fan to duct connections.

 (d)  
Close this P84 panel circuit breaker:
 1) PRI AFT EQUIP COOL FAN PWR

 E. Put the Airplane Back to its usual Condition
 S 414-060
 (1)  Do these steps if you removed the floor panels to get access to the fans:
 (a)  
Install the floor panel that you removed (AMM 53-21-02/401).

 (b)  
Install the following cargo handling equipment on the floor panels: 1) Roller/Caster Trays (AMM 25-57-04/401) 2) Lock/Stop Roller/Caster Trays (AMM 25-58-01/401) 3) Vertical and Side Restraint/Caster Unit (AMM 25-58-01/401)

 S 864-061
 (2)  Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

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 21-58-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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