(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.
TASK 24-21-04-004-001
2. Lightning Protector Removal (Fig. 401)___________________________
A. 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
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
(1)
Make sure all electrical power is off (Ref 24-22-00/201).
S 864-002
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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
LIGHTNING PROTECTORP514 AND P614 GENERATOR 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 4-PHASE C
LIGHTNING PROTECTOR
(X440) GEN 4-PHASE B
LIGHTNING PROTECTOR
SEE C (X439)
GEN 4-PHASE A SEE C (X438) LIGHTNING PROTECTOR (TYPICAL)
SEE C
P515 AND P615 GENERATOR
3 AND 4 POWER CENTER-RIGHT
C
B
Lightning Protector Installation
Figure 401
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A 747-400 MAINTENANCE MANUAL
(2) S 864-003Make sure the BATTERY switch, on the P5 panel, is set to OFF and attach a DO-NOT-OPERATE tag.
(3) S 014-004Open the applicable panel (in the list below) to get access to the lightning protector.
~....................................... | 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
(4) S 034-005Disconnect the electrical leads from the X1 and X2 terminals on the lightning protector.
(5) S 034-006Remove the two screws that attach the lightning protector to the panel.
(6) S 024-007Remove the lightning protector from the panel.
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