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compressors 14th stage.
High pressure operated aircraft systems include the wing anti---ice, cowl anti---ice
and thrust reverser systems. Bleed air to the high pressure manifold is through
the respective L/R 14th stage bleed air shutoff valves. The shutoff valves are
normally open but can be closed by selecting the 14TH STAGE bleed air
switchlights on the BLEED AIR control panel. The left and right wing anti---ice
systems normally operate independently but can be connected by a wing
isolation shutoff valve which is controlled by the 14TH STAGE ISOL switchlight on
the BLEED AIR control panel.
B. APU Bleed Air
The APU can be used on the ground to supply the low pressure manifold with bleed air
for air-conditioning or engine starting. The APU can also be used in flight, to supply
bleed air for engine starting (double engine failure) to a maximum altitude of 13,000 ft.
and to supply the air--conditioning system to a maximum of 15,000 ft. When the APU is
selected as the bleed air source, the bleed air is supplied through the APU load control
valve (LCV) to the left bleed air manifold. The APU LCV is controlled by a switchlight
on the BLEED AIR control panel. The 10TH STAGE bleed isolation valve must be
opened to pressurize the right manifold. The APU ECU modulates the LCV to limit APU
exhaust gas temperature and to prevent compressor surges.
REV 56, Jan 31/03
Vol. 1 19--20--2
PNEUMATIC
Bleed Air System
Flight Crew Operating Manual MASTER
CSP A--013
Bleed Air System Schematic
Figure 19---20---1
RIGHT
THRUST
REVERSE
POWER
DRIVE
UNIT
LEFT
THRUST
REVERSE
POWER
DRIVE
UNIT
RIGHTAIR
TURBINE
STARTER
LEFT AIR
TURBINE
STARTER
14 TH STAGE 14 TH STAGE
10 TH STAGE 10 TH STAGE
RIGHT
COWL
ANTI--ICE
LEFT
COWL
ANTI--ICE
LEFT WING
ANTI--ICE
VALVE
RIGHT WING
ANTI--ICE
VALVE
RIGHT
FUSELAGE
LEFT
FUSELAGE
LEFT
14 TH
SOV
RIGHT
14 TH
APU LCV SOV
ISOL
ISOL
RIGHT
WING ANTI--ICE
LEFT
WING ANTI--ICE
LEFT
10 TH
SOV
RIGHT
10 TH
SOV
EXTERNAL AIR
SOURCE
LEFT PACK RIGHT PACK
PRSOV
Vol. 1 19--20--3
REV 56, Jan 31/03
PNEUMATIC
Bleed Air System
Flight Crew Operating Manual
CSP A--013
MASTER
Bleed Air System Controls
Figure 19---20---2
Bleed Air Panel
Overhead Panel
14th Stage ISOL
Switchlight
been selected
open.
OPEN -- Indicates
isolation valve has
OPEN -- APU LCV selected
open.
APU LCV Switchlight
FAIL -- APU LCV open when
commanded by the interlock
protection circuit.
L/R 14th Stage Bleed Air Switchlights
DUCT FAIL -- Indicates bleed air leak in
applicable duct. Illuminates during duct
monitor test.
CLOSED -- Indicates shutoff valves fully
closed.
valves.
Controls the 14th--stage bleed air shutoff
10th Stage Isolation Valve Switch/Light
When pressed in, bleed air isolation valve
opens and OPEN (white) comes on.
and OPEN light goes out.
When pressed out, isolation valve closes
10th Stage Left and Right Bleed Air
Switch/Lights
When pressed in, associated bleed air
shutoff valve opens and CLOSED (white)
goes out.
When pressed out, associated bleed air
valve closes and CLOSED (white) comes on.
DUCT FAIL (red) -- Comes on if bleed leak
detector sensors detect a failure in associated
duct section. DUCT FAIL goes out when the
failed duct is isolated and temperature sensor
cools.
REV 56, Jan 31/03
Vol. 1 19--20--4
PNEUMATIC
Bleed Air System
Flight Crew Operating Manual MASTER
CSP A--013
ECS Page
Figure 19---20---3
Environmental Control System Page
Right Bleed Air
Shutoff Valve
Position Indicator
APU Load Control
Valve Position Indicator
10th--Stage Bleed Air
Isolation Valve
Position Indicator
Left 10th--Stage Manifold
Pressure Readout
Left Bleed Air Shutoff
Valve Position Indicator
Right 10th--Stage Manifold
Pressure Readout
Indicates the pneumatic
supply pressure available
for operation of air
conditioning system.
Vol. 1 19--20--5
REV 56, Jan 31/03
PNEUMATIC
Bleed Air System
Flight Crew Operating Manual
CSP A--013
MASTER
Bleed Air System EICAS Indications <MST>
Figure 19---20---4
APU LCV OPEN
10TH SOV CLSD
　
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