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Thermal Switches..................................................................................................19-8
Bleed Air Leak Detection Units .............................................................................19-8
DUCT MON Test...................................................................................................19-9
Controls and Indicators ................................................................................................... 19-11
BLEED AIR Panel ..................................................................................................... 19-11
EICAS STATUS Page............................................................................................... 19-12
EICAS Messages...................................................................................................... 19-12
19-ii For Training Purposes Only
May 03
PNEUMATIC SYSTEM P I LOT T R A I N I N G GU I D E
Page Intentionally Left Blank
List of Figures
Graphic Title Figure
For Training Purposes Only
May 03
19-iii
P I LOT T R A I N I N G GU I D E PNEUMATIC SYSTEM
Pneumatic Schematic .......................................................................................................19-1
10th-Stage Bleed Air Schematic .......................................................................................19-2
14th-Stage Bleed Air Schematic .......................................................................................19-3
Bleed Air Leak Detection Sensing Elements and Thermal Switches................................19-4
Bleed Air Leak Detection System Capabilities..................................................................19-5
BLEED AIR Panel .............................................................................................................19-6
EICAS STATUS Page - Bleed Pressure Readouts ..........................................................19-7
19-iv For Training Purposes Only
May 03
PNEUMATIC SYSTEM P I LOT T R A I N I N G GU I D E
Page Intentionally Left Blank
PNEUMATIC SYSTEM
For Training Purposes Only
Jan 04
19-1
P I LOT T R A I N I N G GU I D E
CHAPTER 19: PNEUMATIC SYSTEM Introduction
The pneumatic system consists of two separate bleed air systems; 10th-stage and 14thstage
bleed air. The 10th-stage bleed air is supplied from the engines, the APU or an
external air source. The 14th-stage bleed air is supplied from the engines.
The pneumatics system also includes a bleed air leak detection system that warns the
flight crew of possible duct ruptures.
Pneumatic Schematic
Figure 19-1
R T/R
PDU
L WING
A/I
VALVE
R WING
A/I
VALVE
L
14TH
SOV
R
14TH
SOV
R COWL
A/ICE
10TH STAGE
14TH STAGE
R
ATS
ISOL
L
10TH
SOV
R
10TH
SOV
APU
L T/R
PDU
L COWL
A/ICE
L
ATS
14TH STAGE
10TH STAGE
L ACU R ACU
L WING ANTI-ICE
R WING ANTI-ICE
LCV
LEFT
FUSELAGE
RIGHT
FUSELAGE
EXTERNAL
AIR SOURCE
BLEED
AIR
PORTS
10TH-STAGE
BLEED AIR
14TH-STAGE
BLEED AIR
LEGEND
ISOL
P604_19_010
PNEUMATIC SYSTEM
19-2 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
10th-Stage Bleed Air
Description
The 10th-stage bleed air is supplied from the left and right engine compressor’s 10th
stage, the APU or an external air source. The bleed air is distributed to the various
systems by the 10th-stage bleed air manifold.
Bleed air from the 10th-stage manifold is used for:
• engine starting
• air conditioning and pressurization
10th-Stage Bleed Air Schematic
Figure 19-2
10TH STAGE
APU LCV
FAIL
OPEN
ISOL
OPEN
L
DUCT
FAIL
CLOSED
R
DUCT
FAIL
CLOSED
BLEED AIR PANEL
10th
Stage
10th
Stage
L SOV ISOL R SOV
LCV
ATS ATS
APU
L ACU R ACU
Ext Air
Source
Press
Xducer
P604_19_007
PNEUMATIC SYSTEM
For Training Purposes Only
Sept 04
19-3
P I LOT T R A I N I N G GU I D E
Components and Operation
10th-Stage Bleed Air Manifold
The 10th-stage bleed air manifold is located in the aft equipment bay. An isolation
valve divides the 10th stage into the left and right manifolds. With the isolation valve
closed, the left manifold may be pressurized from external air, APU or left engine
bleed air. The right engine bleed air normally pressurizes the right manifold.
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