COCKPIT DISTRIBUTION
AIRCRAFT
MAINTENANCE MANUAL
EFFECTIVITY:ALL
Embraer 190 - SDS 2327
21-21-00 Page 1 of 10
Rev 19 - Aug 04/14
Copyright © by Embraer S.A. All rights reserved – See title page for details.

Introduction
The cockpit distribution system receives conditioned air from the main
distribution ducts and distributes this air to the cockpit.
The figure COCKPIT DISTRIBUTION - COMPONENT LOCATION
provides further data on the preceding text.
AIRCRAFT
MAINTENANCE MANUAL
EFFECTIVITY:ALL
Embraer 190 - SDS 2327
21-21-00 Page 2 of 10
Rev 19 - Aug 04/14
Copyright © by Embraer S.A. All rights reserved – See title page for details.

EM170SDS210054.DGN
A
A
A
ZONES
221, 222
223, 224
COCKPIT DISTRIBUTION - COMPONENT LOCATION
AIRCRAFT
MAINTENANCE MANUAL
EFFECTIVITY:ALL
Embraer 190 - SDS 2327
21-21-00 Page 3 of 10
Rev 19 - Aug 04/14
Copyright © by Embraer S.A. All rights reserved – See title page for details.

General Description
Normally 60% of the mixed air from the left side ECU (Environmental
Control Unit) goes to the cockpit and 40% goes to the passenger cabin
through the mixing manifold (H-duct).
The temperature-controlled air from the left side air conditioning packs
(ECU) goes through the mixing duct into the cockpit. The cockpit
distribution ducts guide this air to the pilots' feet, ceiling and lateral
outlets.
In the cockpit, the cold air is also used for ventilation of the display
panel.
Air passages located in the cockpit floor, under the pilots' seats, lateral
consoles, and the control column opening let the air return to the
recirculation fans (AMM SDS 21-24-00/1) and to the aircraft outflow and
pressure relief valves (AMM SDS 21-30-00/1).
The figure COCKPIT DISTRIBUTION - COMPONENT LOCATION
provides further data on the preceding text.
AIRCRAFT
MAINTENANCE MANUAL
EFFECTIVITY:ALL
Embraer 190 - SDS 2327
21-21-00 Page 4 of 10
Rev 19 - Aug 04/14
Copyright © by Embraer S.A. All rights reserved – See title page for details.

EM170SDS210038.DGN
A
A
COCKPIT AIR
CONDITIONING
OUTLETS
PILOT’S FEET OUTLET
SHUTOFF VALVE
COCKPIT AIR
CONDITIONING
OUTLET
DISPLAY
COOLING
DUCTS
COCKPIT AIR
CONDITIONING
OUTLETS
DISPLAY
COOLING
DUCTS
PILOT’S FEET OUTLET
SHUTOFF VALVE
COCKPIT
DISTRIBUTION
DUCTS
COCKPIT
DISTRIBUTION
DUCTS
A
ZONES
123/124
221/222
223/224
COCKPIT DISTRIBUTION - COMPONENT LOCATION
AIRCRAFT
MAINTENANCE MANUAL
EFFECTIVITY:ALL
Embraer 190 - SDS 2327
21-21-00 Page 5 of 10
Rev 19 - Aug 04/14
Copyright © by Embraer S.A. All rights reserved – See title page for details.

Components
COCKPIT DISTRIBUTION DUCTS
The ducts in the cockpit receive the airflow from the main distribution
ducts (AMM SDS 21-20-00/1) and send this air to the cockpit air
outlets.
COCKPIT AIR CONDITIONING OUTLETS
There is one outlet in each lateral console that directs the air to the
pilots' seats. There is also a triangular-shaped manifold that creates a
film of conditioned air over the direct-vision window.
PILOTS' FEET OUTLET SHUTOFF VALVES
Each pilots' feet outlet has a mechanically operated valve. The handles
that operate these valves are installed on the pilot and copilot lateral
consoles.
DISPLAY COOLING DUCT
The display cooling duct is a piccolo duct which blows conditioned air
on the displays (PFD (Primary Flight Display), MFD (Multi-Function
Display) and EICAS (Engine Indication and Crew Alerting System)).
The figure COCKPIT DISTRIBUTION - VIEW OF COMPONENTS
provides further data on the preceding text.
AIRCRAFT
MAINTENANCE MANUAL
EFFECTIVITY:ALL
Embraer 190 - SDS 2327
21-21-00 Page 6 of 10
Rev 19 - Aug 04/14
Copyright © by Embraer S.A. All rights reserved – See title page for details.

EM170SDS210053.DGN
A
A
A
MID CEILING
AIR OUTLET
REAR CEILING
AIR OUTLET
REAR CEILING
AIR OUTLET
AIR CONDITIONING
OUTLET
AIR CONDITIONING
OUTLET
ZONES
221, 222
223, 224
PILOT’S FEET
VALVE OUTLET
PILOT’S FEET
VALVE OUTLET
DIRECT VISION
WINDOW
AIR OUTLET
DIRECT VISION
WINDOW
AIR OUTLET
COCKPIT DISTRIBUTION - VIEW OF COMPONENTS
AIRCRAFT
MAINTENANCE MANUAL
EFFECTIVITY:ALL
Embraer 190 - SDS 2327
21-21-00 Page 7 of 10
Rev 19 - Aug 04/14
Copyright © by Embraer S.A. All rights reserved – See title page for details.

Operation
Usually, the air from the left ECU supplies the cockpit. Through the
mixing manifold (H-duct), 60% of the mixed air goes to the cockpit and
40% goes to the passenger cabin.
In the cockpit, the air flows to the outlets in the lateral console, ceiling,
direct-vision windows, displays and feet valves. The pilots can control
the feet valves through the handle located on the lateral console panel.
When the left ECU is not in operation, the right ECU can supply air to
the cockpit through the mixing manifold (H-duct).
The figure COCKPIT DISTRIBUTION - SCHEMATIC DIAGRAM
provides further data on the preceding text.
AIRCRAFT
MAINTENANCE MANUAL
EFFECTIVITY:ALL
Embraer 190 - SDS 2327
21-21-00 Page 8 of 10
Rev 19 - Aug 04/14
Copyright © by Embraer S.A. All rights reserved – See title page for details.

COCKPIT PASSENGER CABIN
PRESSURIZED AREA
UNPRESSURIZED AREA
H−DUCT
(MIXING MANIFOLD)
TO CABIN
40%
TO
COCKPIT
60%
TO CABIN
50%
TO
CABIN
50%
TO GASPERS
AIR FLOW
FROM LEFT
PACK, LEFT
RECIRC. FAN,
RAM AIR OR
GND CART
AIR FLOW
FROM RIGHT
PACK, RIGHT
RECIRC. FAN,
RAM AIR OR
GND CART
EM170SDS210001A.DGN
COCKPIT DISTRIBUTION - SCHEMATIC DIAGRAM
AIRCRAFT
MAINTENANCE MANUAL
EFFECTIVITY:ALL
Embraer 190 - SDS 2327
21-21-00 Page 9 of 10
Rev 19 - Aug 04/14
Copyright © by Embraer S.A. All rights reserved – See title page for details.

Training Information Points
CAUTION: TO PREVENT DAMAGE TO THE AIR CONDITIONING
SYSTEM COMPONENTS, APPLY THE ELECTRICAL
POWER BEFORE YOU APPLY THE PNEUMATIC POWER
AND REMOVE THE PNEUMATIC POWER BEFORE YOU
REMOVE THE ELECTRICAL POWER.
The cockpit ducts are installed in the aircraft with tie-down straps.
During removal/installation procedures you must use an appropriate
tool to install and tension the tie-down straps that attach the ducts to
the adjacent components and structure supports. The ducts are made
of composite material. If you do not apply the correct tension to the tie-
down straps, the ducts might be damaged.
AIRCRAFT
MAINTENANCE MANUAL
EFFECTIVITY:ALL
Embraer 190 - SDS 2327
21-21-00 Page 10 of 10
Rev 19 - Aug 04/14
Copyright © by Embraer S.A. All rights reserved – See title page for details.