C.  Procedure
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A
747-400
MAINTENANCE MANUAL

M7603 FWD ELECTRICAL SYSTEMS CARD FILE
SEE A
ECS MISCELLANEOUS CARD
A
ECS Miscellaneous Card Installation Figure 401
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747-400 MAINTENANCE MANUAL
 S 244-014
 CAUTION:_______ CAUTION:  DO NOT TOUCH THE CARD BEFORE YOU DO THE STATIC
 GROUNDING PROCEDURE.  ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE
 TO THE CARD.  THE ECS MISCELLANEOUS CARD IS AN ELECTROSTATIC

 DISCHARGE SENSITIVE DEVICE AND COULD BE DAMAGED.
 (1)  
Install the ECS miscellaneous card in the M7603 forward electrical systems card file.

 S 864-006

 (2)  
Close the circuit breaker 6J33 ECS MISC PC ASSY on the P6 main power distribution panel.

 S 864-007

 (3)  
Apply electrical power (Ref 24-22-00/201).

 S 744-010

 (4)  
Do a ground test on any CMC CDU (AMM 21-31-00/501).

 (a)  
Select GROUND TEST on the CMC CDU, select chapter 21 AIR CONDITIONING - OVBD VALVE SYSTEM.

 (b)  
Make sure IN PROGRESS is shown on the CMC CDU.

 (c)  
Make sure PASS is shown on the CMC CDU.

 S 864-011
 (5)  Remove electrical power (Ref 24-22-00/201).
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747-400 MAINTENANCE MANUAL
 FLIGHT DECK VENTILATION FAN - REMOVAL/INSTALLATION
__________________________________________________
 1.  General________
 A.  The flight deck ventilation fan is at the top of the fuselage in the area aft of the crew rest area on the left side of the airplane.
 B.  You can get access to the fan through the access door on the aft side of the crew rest area.
 TASK 21-26-06-004-001
 2.  Flight Deck Ventilation Fan Removal___________________________________
 A.  References
 (1)  
SSM 21-25-06

 (2)  
WDM 21-25-13

 B.  Access
 (1)  Location Zone
 233 Area Aft of Crew Rest, LH

 C.  Prepare for Removal
 S 864-002
 (1) Open these circuit breakers and attach DO-NOT-CLOSE identifiers:
 (a)  
Main power distribution panel, P6
 1) 6H31, FLT DK AIR FLOW CONT

 (b)  
Right Power Distribution Center, P415 1) 415D38, FLIGHT DECK FAN POWER

 S 014-003
 (2)  Get access to the fan through the access door on the aft end of the crew rest area.
 D.  Remove the Fan
 S 034-004
 (1)  
Disconnect the electrical connector, DH544, from the fan.

 (2)
Remove the four clamps at the inlet and the outlet of the fan.

 S 034-006

 (3)  
Pull the two duct sleeves away from the inlet and the outlet of the fan.

 (4)  
Remove the bolts, nuts, and washers from the two fan support rods.

 S 034-008

 (5)  
Hold the fan while you remove the 3 nuts and washers that hold the fan to the support bracket.

 S 034-005
 S 034-007
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