B.
There are 12 lightning protectors, three for each engine generator:

 (1)  
X435, X436, and X437 for generator 1

 (2)  
X441, X442, and X443 for generator 2

 (3)  
X444, X445, and X446 for generator 3

 (4)  
X438, X439, and X440 for generator 4.

 C.  
The lightning protectors are installed in the four generator power center panels (P514, P515, P614, and P615) in the E/E compartment.

 D.  
Access to the E/E compartment is through a door behind the nose wheel or through the forward cargo compartment.

 NOTE: The test steps provided in the following may be accomplished on
____ the airplane if test equipment is available or lightning protector may be removed and tested on the bench.
 TASK 24-21-04-725-001
 2.  Lightning Protector Test (Fig. 501)
________________________
 A.  Special Tools and Equipment
 (1)  
TE69B48251 - Test Set, Lightning Protectors

 B.  
References

 (1)  
24-22-00/201, Manual Control

 (2)  
IPC 24-21-04 Fig. 1

 (3)  
IPC 24-21-04 Fig. 2

 (4)  
IPC 24-21-04 Fig. 3

 (5)  
IPC 24-21-04 Fig. 4

 (6)  
WDM 24-22-11, 24-22-12, 24-22-13, 24-22-14

 (7)  
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

 D.  
Procedure

 (1)  
Make sure all electrical power is off (Ref 24-22-00/201).

 S 865-002
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
SEE B
LIGHTNING PROTECTOR LIGHTNING PROTECTOR
GEN 1-PHASE B GEN 1-PHASE A
(X436) (X435)
SEE C LIGHTNING PROTECTOR SEE C GEN 1-PHASE C (X437)
SEE C
P514 SEE A
P614
LIGHTNING PROTECTOR GEN 2-PHASE A
LIGHTNING PROTECTOR
(X441)  LIGHTNING PROTECTOR
GEN 2-PHASE B GEN 2-PHASE C
SEE C (X442)
(X443) SEE C
SEE C
P514 and P614 GENERATOR
LIGHTNING PROTECTOR GEN 3-PHASE A 1 and 2 POWER CENTER-LEFT
LIGHTNING PROTECTOR(X444) GEN 3-PHASE B
LIGHTNING PROTECTOR  ASEE C (X445)
GEN 3-PHASE C SEE C (X446)
SEE C
P515
P615
LIGHTNING PROTECTOR
GEN 3-PHASE C

LIGHTNING PROTECTOR
(X440) GEN 4-PHASE B
LIGHTNING PROTECTOR
SEE C (X439)

GEN 4-PHASE A SEE C
(X438)
SEE C
P515 and P615 GENERATOR
3 and 4 POWER CENTER-RIGHT

B
Lightning Protector Operational Test
Figure 501 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

AIRPLANE GROUND
TEST CIRCUIT
Lightning Protector Operational Test

Figure 501 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 015-004
 (2)  Open the applicable panel, in the table below, to get access to the lightning protector that you will test.
 ~....................................... | 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
　
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