* SEE THE WDM EQUIPMENT LIST
Indication - Component Index
Figure 101 (Sheet 2)

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A

747-400 FAULT ISOLATION/MAINT MANUAL 
PANEL, M7321 ANTI-ICE  P180 PANEL 
SEE  A 

P6 PANEL
MAIN EQUIPMENT CENTER
FLIGHT COMPARTMENT
ENGINE 2 NACELLE 
YMES002 ANTI-ICE SWITCH,  NACELLE ANTI-ICE  ENGINE 3 NACELLE 
2  3  ANTI-ICE SWITCH, 
ENGINE 1 NACELLE  1  ON  ON  4  YMES003 
ANTI-ICE SWITCH,  w  w 
YMES001  ON  w  VALVE a  VALVE a  ON  w 
VALVE  VALVE 
a  a 
ON  ENGINE 4 NACELLE 
w 
ANTI-ICE SWITCH, 
VALVE a  YMES004 
WING  ANTI-ICE 

ANTI-ICE PANEL, M7321
A

AIR CONDITIONING BAY
DOOR, 191NL OR 192JR

SEE C SHT 2
BLEED AIR PRESSURE SENSOR AND BLEED AIR OVERPRESSURE SWITCH
SEE B SHT 2
Indication - Component Location Figure 102 (Sheet 1)
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747-400
FAULT ISOLATION/MAINT MANUAL

BLEED AIR 
OVERPRESSURE SWITCH,  BLEED AIR 
S1591 (ENGINE 2), S1592 (ENGINE 3)  X846 (ENGINE 1), PRESSURE SENSOR,  HOLES DRAIN 
X995 (ENGINE 4) 

DRAIN HOLES
BLEED AIR BLEED AIR
PRESSURE SENSOR, OVERPRESSURE SWITCH,
X847 (ENGINE 2),
S1590 (ENGINE 1), X994 (ENGINE 3) FWD S1593 (ENGINE 4) FWD
ENGINE 3 BLEED AIR PRESSURE SENSOR ENGINE 4 BLEED AIR PRESSURE SENSOR AND BLEED AIR OVERPRESSURE SWITCH AND BLEED AIR OVERPRESSURE SWITCH (ENGINE 2 IS OPPOSITE) (ENGINE 1 IS OPPOSITE)
B FROM SHT 1  B FROM SHT 1
LEFT, RIGHT
DUCT PRESSURE
TRANSMITTER,
X1017, X1016

SEE D DUCT PRESSURE TRANSMITTER, X1017 (LEFT), X1016 (RIGHT)
FWD 
C FROM SHT 1 AIR CONDITIONING BAY  D (LEFT DUCT PRESSURE TRANSMITTER IS OPPOSITE) RIGHT DUCT PRESSURE TRANSMITTER 

Indication - Component Location
Figure 102 (Sheet 2)

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L98672
A
747-400 FAULT ISOLATION/MAINT MANUAL

Indication - Component Location
Figure 102 (Sheet 3)

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747-400 FAULT ISOLATION/MAINT MANUAL
BLEED AIR FLOW SENSOR, B7020 (ENGINE 1), B7023 (ENGINE 4)
SEE F
BLEED AIR FLOW SENSOR
ELECTRICAL CONNECTOR
PNEUMATIC
DUCT

BLEED AIR FLOW SENSOR
B7020 (ENGINE 1), B7021 (ENGINE 2),
B7022 (ENGINE 3), B7023 (ENGINE 4)

F
BLEED AIR FLOW SENSOR, B7021 (ENGINE 2), B7022 (ENGINE 3)
SEE F BLEED AIR FLOW SIGNAL CONDITIONER MODULE, B7019
SEE G
MAIN EQUIPMENT CENTER

117AL
BLEED AIR FLOW SIGNAL CONDITIONER MODULE, B7019 (E1-5) FWD
G
Indication - Component Location
Figure 102 (Sheet 4)

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