S 024-136
 CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE FMC.
_______ IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE FMC.
 (2)  Remove the applicable FMC from the E2-1 or the E2-3 shelf (AMM 20-11-22/401).
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747-400
MAINTENANCE MANUAL

 TASK 34-61-01-404-137
 3. Flight Management Computer Installation
_______________________________________
 A. References
 (1)  
AMM 20-11-22/401, Rack Mounted Components

 (2)  
AMM 34-61-00/501, Flight Management Computer

 (3)  
IPC 34-61-01 Fig. 1

 B. Access
 (1)  Location Zones 118 Electrical and Electronics Compartment, RH 221 Control Cabin, LH 222 Control Cabin, RH
 C. Procedure
 S 864-138
 (1)  Make sure this circuit breaker is closed:
 (a)  P7 Overhead Circuit Creaker Panel 1) 7F23 LANDING GEAR DSP & CONT ALTN
 S 424-139
 CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE FMC.
_______ IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE FMC.
 (2)  
Install the applicable FMC in the E2-1 or the E2-3 shelf (AMM 20-11-22/401).

 S 864-140

 (3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  P7 Overhead Circuit Breaker Panel
 1) 7C2 FMCS CDU L
 2) 7C3 FMCS CDU C
 3) 7C4 FMCS A/T SERVO L
 4) 7C24 FMCS CDU R
 5) 7C25 FMCS A/T SERVO EXC
 6) 7C26 FMCS A/T SERVO R
 7) 7E24 AUTO FLT WARN

 S 714-141
 (4)  Do these tasks after you install the FMC:
 (a)  
FMC Software Installation with a Data Loader (AMM 34-61-00/201).

 (b)  
Ground Test - Flight Management Computers (AMM 34-61-00/501).

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747-400 MAINTENANCE MANUAL
 CONTROL DISPLAY UNIT - SERVICING
________________________________
 1.  General_______
 A.  This subject has three tasks. The first task is to clean the inlet screen for the cooling air.
 B.  The second task is to clean the CDU display screen.
 C.  The third task is the replacement of the CDU annunciator lamp. This task has these parts:
 (1)  
The removal of the CDU key lamp

 (2)  
The installation of the CDU key lamp

 (3)  
A test of the CDU key lamp

 D.  The fourth task is the replacement of the EXEC key lamp. This task has these parts:
 (1)  
The removal of the CDU EXEC key assembly.

 (2)  
The installation of the CDU EXEC key assembly.

 (3)  
A test of the CDU EXEC key lamp.

 E.  The CDUs are installed in the flight compartment. Two CDUs are on the forward electronic panel (P9) and one CDU is on the aft electronic panel (P8).
 TASK 34-61-02-103-034
 2.  Cooling Air Inlet Screen Cleaning_________________________________
 A.  General
 (1)  The inlet screen for the cooling air is installed on the rear of the CDU.
 B.  Standard Tools and Equipment
 (1)  Vacuum Source
 C.  References
 (1)  
34-61-02/401, Control Display Unit

 (2)  
IPC 34-61-02-01

 D.  Access
 (1)  Location Zone
 221 Control Cabin, LH
 222 Control Cabin, RH

 E.  Procedure
 S 843-035
 (1)
Do the "Control Display Unit Removal" task (Ref 34-61-02/401).

 (2)  
Put the CDU on a stable surface.

 (3)
Remove all the dirt from the inlet screen with a vacuum source.
　
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