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Manual Mode ...................................................................................................... 13-54
Manual Mode Operation...................................................................................... 13-55
Landing Elevation................................................................................................ 13-56
Rate Limit Selection ............................................................................................ 13-57
Emergency Depressurization.................................................................................... 13-58
Cabin Altitude Limitation ........................................................................................... 13-58
Outflow Valve Travel Limiter ..................................................................................... 13-59
Close Outflow Valve.................................................................................................. 13-59
Automatic Ditching Sequence................................................................................... 13-59
Manual Ditching Sequence ....................................................................................... 13-60
Safety Valves ............................................................................................................ 13-60
System Safeties ........................................................................................................ 13-61
Overpressure Relief .................................................................................................. 13-61
Negative Pressure Relief .......................................................................................... 13-61
Door Open Protection ............................................................................................... 13-62
EICAS Philosophy..................................................................................................... 13-63
Bleed/Air Conditioning/Pressurization EICAS Messages ......................................... 13-64
EMS Circuit Protection.............................................................................................. 13-67
For Training Purposes Only
Sept 04
13-1
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
INTRODUCTION
BLEED AIR SYSTEM
The Bleed Air System is controlled during all phases of operation by two Bleed
Management Controllers (BMC). The BMCs provide indications and warnings to
EICAS and maintenance information to CAIMS.
In the Bleed Air System, normal flight operations, supplies air from the engines to the
ECS and Wing and Cowl Anti-Ice systems. For more information on Ice and Rain
Protection, refer to Chapter 3.
On the ground air is normally supplied from the APU. A high-pressure ground air
supply unit or bleed air from the engines can also be used.
The Bleed Air System control panel is located on the overhead panel.
ENVIRONMENTAL CONTROL SYSTEM (ECS)
The Environmental Control System (ECS) performs the following functions:
• Provides conditioned air
• Provides ram air in the event of a total ECS failure
• Provides air for pressurization control
• Controls cockpit and passenger compartment temperature control
• Provides sufficient airflow for emergency pressurization
• Provides air recirculation
• Exhausts the air from the cockpit and the cabin
• Exhausts the air from the toilets and the galley(s)
• Ventilates the avionics bay and cockpit displays
• Provides indications and warnings to the EICAS and maintenance information to
the Central Aircraft Information Maintenance System (CAIMS)
The air conditioning system is controlled during all phases of operation by two Air
Conditioning System Controllers (ACSC). The ACSCs provide indications and
warnings to EICAS and maintenance information to CAIMS.
The air conditioning system is comprised of the following subsystems:
• Flow Control System
• Air Conditioning Units (2)
• Temperature Control System
• Air Distribution and Exhaust System
• Emergency Pressurization System
The Air Conditioning System control panel is located on the overhead panel.
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
13-2 For Training Purposes Only
Sept 04
CABIN PRESSURE CONTROL SYSTEM (CPCS)
The Cabin Pressure Control System (CPCS) is composed of two controllers, two
outflow valves, and two safety valves. The CPCS provides indications and warnings to
EICAS and maintenance information to CAIMS.
The system includes safety devices which affect outflow valve travel limitation, cabin
altitude limitation, and differential pressure limits.
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