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9 Wing Anti-ice Indication
Indicates wing anti-ice on.
10 Isolation Valve
Indicates open or closed position of isolation valve.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
2.10.14 D6-30151-425
Air Systems -
Controls and Indicators
11 Engine Bleed Air Valve
Indicates open or closed position of engine bleed air valve.
12 Nacelle Anti-ice Indication
Indicates nacelle anti-ice on.
December 01, 1999
747 Operations Manual
Air Systems -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 2.10.15
Duct Pressure and Cabin Altitude Indications
Duct pressure, cabin altitude, rate, landing altitude, and differential pressure are
displayed when:
• landing altitude MAN
• cabin altitude in caution (amber) or warning (red) range
• cabin differential pressure in caution (amber) or warning (red) range
• ECS or ENG synoptic selected on secondary EICAS display
1 Bleed Air Duct Pressure
White - 12 psi and above.
Amber - 11 psi and below.
2 Cabin Altitude
Indicates cabin altitude.
3 Landing Altitude
• inhibited if both cabin altitude controllers A and B fail
• inhibited if both left and right outflow valves are in manual control
100
DUCT PRESS
CAB ALT
LDG ALT
RATE
~P
30 30
6250 0
AUTO 8 8
LDG ALT 5300MAN
2
4
3
5
PRIMARY EICAS DISPLAY
6
1
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
2.10.16 D6-30151-425
Air Systems -
Controls and Indicators
4 Landing Altitude Selection
AUTO (white) - altitude set automatically from FMC.
MAN (amber) - altitude set by Landing Altitude selector.
5 Cabin Rate of Climb
Indicates cabin altitude rate of climb.
6 Cabin Differential Pressure
Indicates cabin differential pressure.
December 01, 1999
747 Operations Manual
Air Systems Chapter 2
Air Conditioning System Description Section 20
Copyright © The Boeing Company. See title page for details.
D6-30151-425 2.20.1
Introduction
The air conditioning system supplies conditioned bleed air and recirculated cabin
air at a controlled temperature throughout the airplane.
The system supplies conditioned air to the flight deck shoulder heaters.
The system supplies ventilation for the passenger cabin:
• lavatories
• galleys
• flight deck crew rest
• door 5 crew rest
Pack control, zone temperature control, cabin air recirculation, fault detection, and
overheat protection are all automatic. Backup system control modes operate in the
event of system failures.
The airplane is divided into seven temperature zones:
• flight deck
• upper deck
• five main deck cabin zones A through E
Air Conditioning Packs
Three identical air conditioning packs cool bleed air from the engines, APU, or
high pressure air from a ground source. Bleed air is precooled before entering the
pack. The packs are controlled by two identical pack controllers, A and B. Each
controller has three separate channels, one for each pack. Control of the packs
switches automatically to the other controller at touchdown. If a controller detects
a fault in a pack channel, control of the respective pack switches to the other
controller.
Pack output increases during high pack demand periods (to compensate for a
failed pack or recirculation fan), or is limited during high bleed air demand periods
(such as for gear retraction).
When a pack controller is placed in NORM, A, or B, the pack valve opens, which
allows bleed air to flow into the pack.
The pack valve is controlled electrically by the pack controller and opens by bleed
air pressure.
Each pack valve has two flow settings, normal and high. During cruise, normal
flow minimizes bleed air demand on the engine to reduce fuel consumption.
Packs may be set manually to high flow by pushing the High Flow switch ON.
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
2.20.2 D6-30151-425
Air Systems -
Air Conditioning System
Description
Pack Non–Normal Operation
Pack control, fault detection, and overheat protection are all automatic. When an
overheat or controller fault is detected, the respective pack valve closes resulting
in a pack shut down.
If a pack controller does not switch automatically to the other controller, selecting
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