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2
SYS
FAULT
OFF
NORM
A
B
1 PACKS
L ISLN
APU
WING
TAI
ENGINE
BLEED
ON
OFF
ON
SYS
FAULT
3
OFF
4
SYS
FAULT
ON
OFF
ON
SYS
FAULT
VALVE
ON
VALVE VALVE
OFF
NORM
A
B
2
OFF
NORM
A
B
PACKS
WING
TAI
3
R ISLN
1
2
3 7
4
5
6
OVERHEAD PANEL
October 1, 2000
747 Operations Manual
Air Systems -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 2.10.11
3 APU Bleed Air Switch
ON - valve commanded open when EICAS memo message APU RUNNING
displayed.
Off - valve closed.
4 Engine Bleed Air System (SYS) FAULT Light
Illuminated (amber) -
• bleed air overheat, or
• bleed air overpressure, or
• HP bleed valve open when commanded closed, or
• PRV open when commanded closed
5 ENGINE BLEED Air Switch
ON -
• engine bleed air valve opens for engine start
• engine bleed air valve, PRV, and HP bleed valve open by system logic
when bleed air pressure available
Off -
• engine bleed air valve, PRV, and HP bleed valve closed
• PRV opens when nacelle anti-ice on, unlessPRV closed by:
• prior or present bleed air overheat, or
• start valve not closed, or
• HP bleed valve failed open
• HP bleed valve and PRV open for thrust reverse, unless PRV closed by:
• prior or present bleed air overheat, or
• start valve not closed
6 ENGINE BLEED Air OFF Light
Illuminated (amber) - engine bleed air valve closed.
7 APU Bleed Air VALVE Light
Illuminated (amber) - APU bleed air isolation valve position disagrees with switch
position.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
2.10.12 D6-30151-425
Air Systems -
Controls and Indicators
ECS Displays and Indications
ECS Synoptic Display
The ECS synoptic is displayed by pushing the ECS switch on the display select
panel. Display select panel operation is described in Chapter 10, Flight
Instruments, Displays.
Air flow displayed is generated by displayed valve positions, switch positions, and
pack status. It does not display actual air flow, therefore the display may not
represent actual system operation.
1 Zone Temperatures
F/D, U/D, A, B, C, D, and E - zone target temperatures on left and actual
temperatures on right for respective air conditioning zone.
0
PSI
DUCT
30
PSI
DUCT
APU
B
3
PACK CONTROL
TAI
WING
TAI
NAC
TAI
NAC
TAI
WING
2
A
1
OFF
OFF
1 ENG 2 3 ENG 4
PACK CONTROL
EXT AIR
NO AIR FLOW
AIR FLOW THROUGH DUCT
FLOW LINES
HI FLOW HI FLOW
MAN AUTO
CL
OP
L R
OUTFLOW VALVES
79 77 79
79 77 79 79 79
79 77
79 77
MASTER
FWD
A B C D E
F/D U/D
TEMP `F
77
79 77 77
BULK
77
AFT
77
1
2
5
4
8
3
12
7
6
9
11
10
LOWER EICAS DISPLAY
December 01, 1999
747 Operations Manual
Air Systems -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 2.10.13
MASTER - temperature setting of Passenger Temperature selector.
FWD, AFT, BULK - actual temperature of cargo compartment.
2 Pack Control
OFF - pack valve closed.
A - indicates pack controller A in use.
B - indicates pack controller B in use.
3 APU Bleed Air Isolation Valve
Indicates open or closed position of isolation valve.
4 External Air Indication
• displayed if a pack operating with APU and engines off, or bleed air ducts
pressurized with APU and engines off
• indication remains displayed momentarily after external air source
removed
5 Outflow Valves Position
Indicates position of outflow valves.
6 Outflow Valve Control Source
MAN - indicates manual control of outflow valves.
AUTO - indicates FMS control of outflow valves.
7 High Flow Indication
HI FLOW -
• pack operating in high flow mode
• indication removed in normal flow or when pack OFF
8 Bleed Air Duct Pressure
White - 12 psi and above.
Amber - 11 psi and below.
　
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