24-21-04
 ALL  ú ú 04 Page 403 ú Oct 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 TASK 24-21-04-404-008
 3.  Lightning Protector Installation (Fig. 401)________________________________
 A. References
 (1)  
IPC 24-21-04 Fig. 1

 (2)  
IPC 24-21-04 Fig. 2

 (3)  
IPC 24-21-04 Fig. 3

 (4)  
IPC 24-21-04 Fig. 4

 (5)  
WDM 24-22-11, 24-22-12, 24-22-13, 24-22-14

 (6)  
SSM 24-22-01

 B. Access
 (1)  
Location Zone 117 Electrical and Electronics Compartment, LH 118 Electrical and Electronics Compartment, RH

 (2)  
Access Panel
 P514 Generator 1 Power Center - Left
 P614 Generator 2 Power Center - Left
 P515 Generator 3 Power Center - Right
 P615 Generator 4 Power Center - Right

 C. Procedure
 S 424-015
 (1)  
Install the lightning protector.

 (a)  
Put the lightning protector in its position on the panel. (Refer to the table below for the equipment numbers.)

 ~....................................... | Equipment Number | ......................................... | Lightning | Phase | Panel | | Protector | | | ......................................... | X435 | A | P514 | | X436 | B | P514 | | X437 | C | P514 | | X438 | A | P615 | | X439 | B | P615 | | X440 | C | P615 | | X441 | A | P614 | | X442 | B | P614 | | X443 | C | P614 | | X444 | A | P515 | | X445 | B | P515 | | X446 | C | P515 | 2............….............…............1
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 24-21-04
 ALL  ú ú 03 Page 404 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 (b)  
Install the two screws that attach the lightning protector to the panel.

 (c)  
Tighten the screws.

 S 434-011
 (2)  
Connect the electrical leads to the X1 and X2 terminals on the lightning protector.

 S 414-012

 (3)  
Close the panel door.

 S 864-013

 (4)  
Remove the DO-NOT-OPERATE tag from the BATTERY switch.

 TASK 24-21-04-764-016
 4.  Lightning Protector Installation Test______________________________________
 A. General
 (1)  
This task is a short test to verify correct installation of the lightning protector. This test does not check for correct lightning protector operation. The test for lightning protector operation is located in Lightning Protector - Adjustment/Test (AMM 24-21-04/501).

 (2)  
Do the test for the lightning protector that were replaced. You do not need to do the tests for lightning protectors that were not replaced.

 B.
References

 (1)  
24-22-00/201, Manual Control

 (2)  
WDM 24-22-11, 24-22-12, 24-22-13, 24-22-14

 (3)  
SSM 24-22-01

 C.
Access

 (1)  
Location Zone 117 Electrical and Electronics Compartment, LH 118 Electrical and Electronics Compartment, RH

 (2)  
Access Panel
 P514 Generator 1 Power Center - Left
 P614 Generator 2 Power Center - Left
 P515 Generator 3 Power Center - Right
 P615 Generator 4 Power Center - Right

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 24-21-04
 ALL  ú ú 03 Page 405 ú Oct 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 D.  Procedure
 S 764-017
 (1)  
To test the installation of the lightning protector associated with the 115 VAC Bus 1, do the steps that follow:

 (a)  
Open these circuit breakers:

 1)  On the P514 panel: a) C8013 Lightning Prot Phase A b) C8014 Lightning Prot Phase B c) C8015 Lightning Prot Phase C
　
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