(b)  
Make sure the CDU annunciators (DSPL, FAIL, MSG and OFST) lamps come on.

 (c)  
Release the IND LTS switch.

 (d)  
Make sure that the CDU annunciators lamps go off.

 S 843-055
 (4)  Do the "Remove Electrical Power" task (Ref 24-22-00/201).
 TASK 34-61-02-963-058
 5.  EXEC Key Replacement (Fig. 301)_______________________________
 A. General
 (1)  The EXEC key/indicator is installed on the right side of the CDU. You must replace the EXEC key assembly to replace the indicator lamp.
 B. References
 (1)  24-22-00/201, Manual Control
 C. Access
 (1)  Location Zones
 221 Control Cabin, LH
 222 Control Cabin, RH

 D. Procedure
 S 863-059
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Main Power Distribution Panel 1) 6L5 FLT DECK LIGHT CAPT IND DGTL DSPL
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747-400 MAINTENANCE MANUAL
 2) 6F27 FLT DK LIGHTS F/O IND & DGTL DSP
 (b)  P7 Overhead Circuit Breaker Panel
 1) 7C1 FMCS FMC L
 2) 7C2 FMCS CDU L
 3) 7C3 FMCS CDU C
 4) 7C23 FMCS FMC R
 5) 7C24 FMCS CDU R

 S 023-062
 (2)  Remove the EXEC key assembly:
 (a)  
Loosen the two captive screws (4) on the EXEC key assembly (1).

 (b)  
Remove the EXEC key assembly from the keyboard assembly (9).

 NOTE:  Make sure that the rubber tube seal is not left on the CDU when you remove the assembly.
 S 423-061
 (3)  Install the new EXEC key assembly:
 (a)  
Install the new EXEC key assembly (1) on the keyboard assembly (9).

 (b)  
Tighten the two screws (4).

 E. EXEC Key Lamp Test
 S 843-063
 (1)  
Do the "Supply Electrical Power" task (Ref 24-22-00/201).

 S 863-064

 (2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6 Main Power Distribution Panel
 1) 6L5 FLT DECK LIGHT CAPT IND DGTL DSPL
 2) 6F27 FLT DK LIGHTS F/O IND & DGTL DSPL

 (b)  
P7 Overhead Circuit Breaker Panel
 1) 7C1 FMCS FMC L
 2) 7C2 FMCS CDU L
 3) 7C3 FMCS CDU C
 4) 7C23 FMCS FMC R
 5) 7C24 FMCS CDU R

 S 713-065
 (3)  Do a test of the EXEC key lamp:
 (a)  
Push and hold the IND LTS switch, on the P5 pilots overhead panel, to the TEST position.

 (b)  
Make sure the CDU EXEC key lamp comes on.

 (c)  
Release the IND LTS switch.

 (d)  
Make sure that the CDU EXEC key lamp goes off.

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 S 843-066
 (4) Do the "Remove Electrical Power" task (Ref 24-22-00/201).
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747-400
MAINTENANCE MANUAL

9. KEYBOARD ASSEMBLY
5. SIDE ANNUNCIATOR ASSEMBLY
4. CAPTIVE SCREWS 
(2 LOCATIONS)  ASSEMBLY 1. EXEC KEY 
2. CAPTIVE SCREWS 
(2 LOCATIONS) 
7. SECURED 
　
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