Pressure Indication System - Component Index
Figure 101
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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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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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