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TANK - FORWARD, S63 SWITCH - PRESSURE, BOOST PUMP - NO. 1 MAIN  1,2  1  OF NO. 2 TANK END RIB - INBD MAIN TANK, LEFT 573AB, REAR SPAR - 33 INCHES INBD  28-42-01
 TANK - AFT, S64 SWITCH - PRESSURE, BOOST PUMP - NO. 2 MAIN  1,2  1  LEFT (WS 400.00) SUPPORT BEAM - INBD MAIN TANK, REAR SPAR TO LANDING GEAR  28-42-01
 TANK - FORWARD, S65 SWITCH - PRESSURE, BOOST PUMP - NO. 2 MAIN  1,2  1  MAIN TANK, LEFT FRONT SPAR TO MID SPAR - INBD  28-42-01
 TANK - AFT, S69 SWITCH - PRESSURE, BOOST PUMP - NO. 3 MAIN  1,2 1  SUPPORT BEAM - INBD MAIN TANK, RIGHT (WS 400.00) REAR SPAR TO LANDING GEAR  28-42-01
 TANK - FORWARD, S70 SWITCH - PRESSURE, BOOST PUMP - NO. 3 MAIN  1,2  1 FRONT SPAR TO MID SPAR - INBD MAIN TANK, RIGHT 28-42-01 
SWITCH - PRESSURE, BOOST PUMP - NO. 4 MAIN TANK - AFT, S71  1,2 1  OF NO. 3 TANK END RIB - INBD 673AB, REAR SPAR - 31 INCHES INBD MAIN TANK, RIGHT  28-42-01
SWITCH - PRESSURE, BOOST PUMP - NO. 4 MAIN TANK - FORWARD, S72 1,2  1  OF NO. 3 TANK END RIB - INBD 673AB, REAR SPAR - 33 INCHES INBD MAIN TANK, RIGHT  28-42-01
SWITCH - PRESSURE, CONTROL - APU BOOST PUMP, S548  4  1  SUPPORT BEAM, LEFT (WS 400.00) REAR SPAR TO LANDING GEAR  28-25-06 
SWITCH - PRESSURE, OVERRIDE/JETTISON PUMP -CENTER WING TANK - LEFT, S66 3 1 WING WHEEL WELL FOR THE MAIN LANDING GEAR, LEFT 28-42-01 
SWITCH - PRESSURE, OVERRIDE/JETTISON PUMP -CENTER WING TANK - RIGHT, S68  3  1  WING WHEEL WELL FOR THE MAIN LANDING GEAR, RIGHT  28-42-01 
NO. 2 MAIN TANK - AFT (INBD), S239 SWITCH - PRESSURE, OVERRIDE/JETTISON PUMP - 3  1  REAR SPAR TO LANDING GEAR SUPPORT BEAM, LEFT  28-42-01
SWITCH - PRESSURE, OVERRIDE/JETTISON PUMP -NO. 2 MAIN TANK - FORWARD (OUTBD), S238  3 1  REAR SPAR TO LANDING GEAR SUPPORT BEAM, LEFT  28-42-01 
NO. 3 MAIN TANK - AFT (INBD), S240 SWITCH - PRESSURE, OVERRIDE/JETTISON PUMP - 3  1  REAR SPAR TO LANDING GEAR SUPPORT BEAM, RIGHT  28-42-01 
NO. 3 MAIN TANK - FORWARD (OUTBD) S241 SWITCH - PRESSURE, OVERRIDE/JETTISON PUMP - 3  1  SUPPORT BEAM, RIGHT REAR SPAR TO LANDING GEAR  28-42-01 

Pressure Indication System - Component Index
Figure 101

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C20773
A
747-400 FAULT ISOLATION/MAINT MANUAL
PRESSURE SWITCHES FOR THE BOOST PUMPS
SEE A
PRESSURE SWITCH FOR 
THE FORWARD BOOST PUMP 
(NO. 2 OR 3 MAIN TANK) 
SEE  B  SHT 2 
TANK (REF) NO. 1 MAIN  FOR THE NO. 1 OR 4 MAIN TANK (REF) AFT BOOST PUMP  FORWARD BOOST PUMP FOR THE NO. 1 OR 4 MAIN TANK (REF)  TANK (REF) NO. 2 MAIN  CENTER WING TANK (REF) 
(REF) MID SPAR  TANK END RIB (REF) 

FWD
INBD
PRESSURE SWITCH FOR PRESSURE SWITCH FOR PRESSURE SWITCH FORTHE AFT BOOST PUMP THE FORWARD BOOST PUMP
(NO. 1 OR 4 MAIN TANK)  THE AFT BOOST PUMP
(NO. 1 OR 4 MAIN TANK) (NO. 2 OR 3 MAIN TANK)
SEE D SHT 2 SEE D SHT 2 SEE C SHT 2
NOTE: THE LEFT WING IS SHOWN, THE RIGHT WING IS ALMOST THE SAME.
PREESURE SWITCHES FOR THE BOOST PUMPS
A

Pressure Indication System - Component Location
Figure 102 (Sheet 1)

B45737
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
FAULT ISOLATION/MAINT MANUAL

PRESSURE SWITCH FOR THE
FORWARD BOOST PUMP,
S65 OR S70
(NO. 2 OR 3 MAIN TANK)

FORWARD BOOST PUMP FOR THE NO. 2 OR 3 MAIN TANK (REF)
WING REAR SPAR (REF)
FRONT SPAR (REF)
FWD
PRESSURE SWITCH FOR THE FORWARD BOOST PUMP
(NO. 2 OR 3 MAIN TANK)

B
WING
REAR SPAR
(REF) PRESSURE SWITCH FOR THE

AFT BOOST PUMP, S62 OR S71
(NO. 1 OR 4 MAIN TANK)

AFT BOOST PUMP FOR THE NO. 2 MAIN TANK APU BOOST PUMP (REF) (REF)
PRESSURE SWITCH PRESSURE FOR THE APU BOOST SWITCH FOR PUMP CONTROL (REF) THE FORWARD BOOST PUMP, S63 OR S72 PRESSURE SWITCH
　
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