(k)
After approximately 15 seconds, look at the main and auxiliary EICAS displays. 1) Make sure these EICAS messages do not show:
a) FUEL X FEED 2 (advisory) b) FUEL X FEED 3 (advisory) c) FUEL X FEED 2 (status) d) FUEL X FEED 3 (status)
G. Put the Airplane Back to the Usual Condition
S 865-133
(1) Remove the electrical power if it is not necessary
(AMM 24-22-00/201).
TASK 28-22-00-705-106
3. Fuel Pumps - Operational Test
_____________________________
A. General
(1)
This task does an operational test of these fuel-feed pumps:
(a)
Boost pumps for the main tanks
(b)
Override/jettison pumps for the center wing tank (override function)
(c)
Override/jettison pumps for the No. 2 and 3 main tanks (override function)
(2)
This task operates the fuel pumps that are necessary for the fuel-feed system. Make sure the minimum and maximum fuel quantities called out in the prepare for the test procedure are available.
(3)
Do not use the APU to supply the electrical power for this procedure. The APU uses one or more inboard main tank boost pumps to supply the APU with fuel. Because the APU automatically operates the boost pump(s), the flight compartment switch(es) can be in the off position with the boost pumps operational.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
FLIGHT COMPARTMENT
FLOW BAR
INDICATION
LIGHT
FUEL PUMP
SWITCHES
(14 LOCATIONS)
NO. 2 CROSSFEED VALVE (CLOSED)
NO. 1 CROSSFEED VALVE (OPEN)
A
747-400
MAINTENANCE MANUAL
FUEL MANAGEMENT CONTROL MODULE
SEE A
EICAS FUEL
SYNOPTIC
SEE B
FUEL CROSSFEED VALVE SWITCH (4 LOCATIONS)
FUEL MANAGEMENT CONTROL MODULE
A
2 3
CENTER
1 4
52.0
MAIN 2 MAIN 3
36.0 36.0 MAIN 1 MAIN 4
9.0 9.0 RES 2 RES 3
3.9 3.9
EICAS FUEL SYNOPTIC
B
VALVE POSITION DISAGREEMENT LIGHT
NO. 3 CROSSFEED VALVE (CLOSED)
NO. 4 CROSSFEED VALVE (OPEN)
Fuel Crossfeed Valve Control and Indication Location
Figure 501
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
F26520
A
747-400
MAINTENANCE MANUAL
EICAS FUELSYNOPTIC SEE
FUEL CROSSFEED CENTER WING TANK
SWITCH ON VALVE SWITCH OVERRIDE/JETTISON
INDICATION (4 LOCATIONS) PUMP SWITCH
INBOARD MAIN TANK
LOW PRESSURE
OVERRIDE/JETTISON
INDICATION
PUMP SWITCH
LIGHT
(4 LOCATIONS)
FUEL MANAGEMENT CONTROL MODULE
FUEL BOOST PUMP SWITCH (8 LOCATIONS)
Fuel Pump Control and Indication Location
Figure 502 (Sheet 1)
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F26530
A
747-400 MAINTENANCE MANUAL
FORWARD BOOST PUMP FOR RIGHT OVERRIDE/THE NO.2 MAIN TANK JETTISON PUMP FOR(PUMP ON-FLOW) THE CENTER WING TANK
FORWARD OVERRIDE/ JETTISON PUMP FOR THE NO. 3 MAIN TANK
(PUMP OFF) (PUMP OFF)
CROSSFEED
VALVE
FORWARD BOOST
FORWARD BOOST PUMP FOR THE
PUMP FOR THE NO. 4 MAIN TANK
NO. 1 MAIN TANK (PUMP ON-NO FLOW)
AFT BOOST PUMP FOR THE NO. 4 MAIN TANK (PUMP ON-NO FLOW)AFT BOOST PUMP FOR THE NO. 1 MAIN TANK AFT BOOST PUMP FOR THE NO. 2 MAIN TANK (PUMP ON-FLOW)
EICAS FUEL SYNOPTIC
Fuel Pump Control and Indication Location
Figure 502 (Sheet 2)
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