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air from the high pressure (10th stage) compressor port or from the low pressure (6th
stage) compressor port. The ACSC will open or close the HPV depending on the bleed
air manifold pressure and aircraft system requirements.
Manifold pressure is regulated to about 45 psig by the pressure regulating shut-off
valve (PRSOV). When the demand cannot be supplied by the low pressure port, the
ACSC commands the engine HPV open. When the 6th stage air pressure is high
enough to satisfy the requirements of the connected systems, the ACSC commands the
HPV closed.
Vol. 1 19--20--2
PNEUMATIC
Bleed Air System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
B. APU Bleed Air
The APU can be used on the ground to supply the pneumatic system with a
compressed air source for air-conditioning or engine starting. Under certain limitations,
the APU can also be used in flight. When the APU is selected as the bleed air source,
the bleed air is supplied through a load control valve (LCV) to the bleed air manifold.
The ECU modulates the LCV to limit APU exhaust gas temperature. To prevent
compressor surge, a small quantity of compressed air is vented overboard through a
surge control valve.
C. High Pressure Ground Air Connection
An external high pressure ground power cart can be used to supply the bleed air
manifold with compressed air for engine starting. For ground cart operation, the bleed
valves must be selected closed to avoid reverse flow to the engines. Air pressure is
indicated on the EICAS, ECS synoptic page, when AC power is available.
Bleed Air System Environmental Control System Synoptic Page
Figure 19---20---2
closed (white)
failed closed (amber)
Pressure Regulating Shut--Off Valve
APU Load Control Valve
Valve Position Indication
open (white)
failed open (amber)
failed to attain commanded
position (half--intensity magenta)
Bleed Pressure
Displays bleed pressure.
White -- Bleed pressure normal.
Amber -- Bleed pressure high or low.
Amber dashes -- Invalid data.
Bleed Isolation Shut--Off Valve
Environmental Control System Page
BLEED MANUAL
(white)
Indicates that
bleed valves have
been selected to
manual.
Vol. 1 19--20--3
PNEUMATIC
Bleed Air System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Bleed Air System Anti/Ice Synoptic Page
Figure 19---20---3
Anti--Ice Page
ANTI--ICE
ICE
OVHT
ICE DET 1 FAIL
OVHT
WING A/ICE SNSR
Pressure Regulating Shut--Off Valve
Position Indicator
open (white)
closed (white)
failed to attain commanded
position (half--intensity magenta)
Bleed Isolation Shut--Off Valve
Position Indication
closed (white)
failed closed (amber)
open (white)
failed open (amber)
failed to attain commanded
position (half--intensity magenta)
Vol. 1 19--20--4
PNEUMATIC
Bleed Air System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Bleed Air System EICAS Indications <1001>
Figure 19---20---4
APU BLEED ON caution (amber)
Indicates APU bleed is selected above
maximum altitude (25,000 feet).
APU LCV OPEN status (white)
Indicates that APU load control
valve is not closed.
ISOL FAIL caution (amber)
Indicates that bleed isolation shut--off
valve failed to attain selected position.
APU LCV OPEN caution (amber)
Indicates that APU load control valve
failed to close when commanded to close.
APU LCV CLSD caution (amber)
Indicates that APU load control valve
failed to open when commanded to open.
BLEED MISCONFIG caution (amber)
Indicates an impossible bleed configuration
in manual mode.
L or R ENG BLEED caution (amber)
Indicates failure of high pressure valve,
pressure regulating shut--off valve or
controller.
BLEED CLOSED status (white)
Indicates that all bleeds are closed.
BLEED MANUAL status (white)
Indicates that bleed system is in
manual mode.
ISOL OPEN status (white)
Indicates that bleed isolation
shut--off valve is fully open.
L ENG BLEED
R ENG BLEED
APU BLEED ON
BLEED MISCONFIG
APU LCV OPEN
APU LCV CLSD
ISOL FAIL
L ENG BLEED CLSD
R ENG BLEED CLSD
L ENG BLEED SNSR
R ENG BLEED SNSR
BLEED CLOSED
BLEED MANUAL
ISOL OPEN
ISOL CLOSED
APU LCV OPEN
L or R ENG BLEED CLSD status (white)
Indicates that respective engine bleed is not
selected with respective high pressure valve
and pressure regulating shut--off valve closed.
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