FMC MASTER FMC MASTER FMC MASTERRELAY 1, RELAY 2, RELAY 3,R7229 R7230 R7231
FWD
FMC MASTER RELAYS ON E2-2 SHELF
(TOP OF WIU PANEL ROTATED AFT AND DOWN 90`)

C

FMC Master Relays
Figure 401 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-019
 (4)  Prepare to remove the FMC master relay:
 CAUTION: DO NOT TOUCH EQUIPMENT OR WIRES UNTIL THE ESD WRIST STRAP
_______ IS ATTACHED. THE EQUIPMENT AND WIRES CONTAIN OR ARE ATTACHED TO STATIC SENSITIVE EQUIPMENT THAT CAN BE DAMAGED.
 PUT THE ESD WRIST STRAPS ON YOUR WRIST AGAINST YOUR SKIN. THE GROUND CIRCUIT IS NOT ALWAYS COMPLETED IF MATERIAL IS BETWEEN THE STRAP AND YOUR SKIN.
 (a)  Attach the ESD wrist strap to your wrist.
 NOTE: The ESD wrist straps are kept in bags at the two ends of
____ the E/E racks (Fig 401).
 (b)  
Attach the ESD wrist strap to the electronic ground receptacle on the E/E rack (Fig 401).

 (c)  
Remove the four bolts that attach the WIU panel to the shelf (Fig 401).

 (d)  
Pull the top of the WIU panel aft and down 90 degrees to get access to the FMC master relays (Fig 401).

 NOTE: The FMC master relays are aft of the STAB TRIM RUDDER
____ RATIO MODULE and the YAW DAMPER MODULE LOWER.
 S 024-020
 (5)  Remove the FMC master relay (Fig 401):
 (a)  Remove the three screws that hold the relay to the bracket and connector.
 NOTE: The screws will be necessary when you install the relay.
____
 (b)  
Remove the relay.

 (c)  
Remove the ESD wrist strap from the electrostatic ground receptacle on the E/E rack.

 (d)  
Remove the ESD wrist strap from your wrist.

 (e)  
Put the ESD wrist strap to the empty bag at the end of the E/E rack.

 TASK 34-61-05-424-026
 3. FMC Master Relay Installation
_____________________________
 A. References
 (1)  
24-22-00/201, Manual Control

 (2)  
WDM 34-61-16

 (3)  
SSM 34-61-05

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 ALL  ú ú 01 Page 404 ú Jun 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 B. Access
 (1)  Location Zone
 118 Electronic and Electrical Compartment
 221 Control Cabin, LH
 222 Control Cabin, RH

 C. Procedure
 S 864-027
 (1)  
Do the "Remove Electrical Power" task (Ref 24-22-00/201).

 S 864-021

 (2)  
Prepare to install the FMC master relay:

 CAUTION: DO NOT TOUCH EQUIPMENT OR WIRES UNTIL THE ESD WRIST STRAP
_______ IS ATTACHED. THE EQUIPMENT AND WIRES CONTAIN OR ARE ATTACHED TO STATIC SENSITIVE EQUIPMENT THAT CAN BE DAMAGED.
 PUT THE ESD WRIST STRAPS ON YOUR WRIST AGAINST YOUR SKIN. THE GROUND CIRCUIT IS NOT ALWAYS COMPLETED IF MATERIAL IS BETWEEN THE STRAP AND YOUR SKIN.
 (a)  Attach the ESD wrist strap to your wrist.
 NOTE: ESD wrist straps are kept in bags at the two ends of the
____
 E/E racks (Fig 401).

 (b)  Attach the ESD wrist strap to the electronic ground receptacle on the E/E rack (Fig 401).
 S 424-022
 (3)  Install the FMC master relay (Fig 401):
 (a)  
Install the FMC master relay.

 (b)  
Install and tighten the three screws that hold the relay to the bracket and connector.

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