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NOTES
Weather
Receiver /
Transmitter
WEATHER
RADAR R/T K1
Radar
Control
WEATHER
RADAR CONT
1
DC BUS 1 1
K2
Vol. 1 19--00--1
PNEUMATIC
Table of Contents REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
CHAPTER 19 --- PNEUMATIC
TABLE OF CONTENTS
Page
TABLE OF CONTENTS 19--00
Table of Contents 19--00--1
INTRODUCTION 19--10
Introduction 19--10--1
BLEED AIR SYSTEM 19--20
Bleed Air System 19--20--1
Engine Bleed Air 19--20--1
APU Bleed Air 19--20--2
High Pressure Ground Air Connection 19--20--2
System Circuit Breakers 19--20--5
BLEED AIR LEAK DETECTION 19--30
Bleed Air Leak Detection 19--30--1
LIST OF ILLUSTRATIONS
INTRODUCTION
Figure 19--10--1 Bleed Air System Schematic 19--10--2
BLEED AIR SYSTEM
Figure 19--20--1 Bleed Air System Control Panel 19--20--1
Figure 19--20--2 Bleed Air System ECS Synoptic Page 19--20--2
Figure 19--20--3 Bleed Air System A/ICE Synoptic Page 19--20--3
Figure 19--20--4 Bleed Air System EICAS Indications 19--20--4
BLEED AIR LEAK DETECTION
Figure 19--30--1 Bleed Air Leak Detection System 19--30--2
Figure 19--30--2 Bleed Air Leak Detection Anti--Ice --
Duct EICAS Indications 19--30--3
Figure 19--30--3 Bleed Air Leak Detection -- Loop EICAS Indication 19--30--4
Vol. 1 19--00--2
PNEUMATIC
Table of Contents Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
THIS PAGE INTENTIONALLY LEFT BLANK
Vol. 1 19--10--1
PNEUMATIC
Introduction Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
1. INTRODUCTION
The pneumatic system is supplied bleed air from the engine compressors or from the APU
compressor. The supplied air is used for:
S The aircraft environmental control system
S Wing and cowl anti--ice systems.
The pneumatic system can also receive conditioned air from a ground air cart.<1007>
Bleed air management is fully automatic. Two air conditioning system controllers monitor
system health and regulate bleed air pressure to ensure air is supplied at a level of pressure
compatible with proper operation of the pneumatic systems currently connected. Under
non-normal situations, system isolation and manual selection of the bleed air source is
possible using the bleed air panel.
The bleed air leak detection system monitors the pneumatic ducting for high temperature
bleed air leaks. The system will automatically shut down the respective bleed system when
a leak is detected to protect the system components.
Vol. 1 19--10--2
PNEUMATIC
Introduction Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
Bleed Air System Schematic
Figure 19---10---1
HIGH--PRESSURE
VALVE (HPV)
PRSOV
LOW--PRESSURE
PORTS (6th STAGE)
HIGH--PRESSURE
PORTS (10th STAGE)
COWL ANTI--ICE
ATS
T
R / STARTER
AIR VALVE
HIGH--PRESSURE
VALVE (HPV)
PRSOV
LOW--PRESSURE
PORTS (6th STAGE)
HIGH--PRESSURE
PORTS (10th STAGE)
COWL ANTI--ICE
ATS
L / STARTER
AIR VALVE
COWL ANTI--ICE
VALVE
APU
R /AIR
COND
ISOLATION
VALVE
LOAD CONTROL
VALVE (LCV)
H.P. GROUND
AIR SUPPLY
R /WING
ANTI--ICE
T
L /AIR
L /WING COND
ANTI--ICE
COWL ANTI--ICE
VALVE
Vol. 1 19--20--1
PNEUMATIC
Bleed Air System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
1. BLEED AIR SYSTEM
The bleed air system receives pressurized air from the engine compressors, APU
compressor or from an external high pressure ground source.
The bleed air is supplied to various systems through a common manifold which can be
divided into two sections by an bleed isolation shut--off valve. Pneumatically operated
aircraft systems include engine starting, cowl and wing anti-icing, air-conditioning and
pressurization. Two air-conditioning system controllers (ACSC) manage the distribution of
the bleed air and control the air-conditioning systems. Bleed air selection is made using the
BLEED AIR panel located on the overhead panel.
Bleed Air System Control Panel
Figure 19---20---1
Bleed Air Panel
Overhead Panel
ISOL
Used to isolate or interconnect the
left and right pneumatic systems.
Only operative in manual mode.
A. Engine Bleed Air
The engine can supply either low or high pressure bleed air from the compressor
depending on the position of the engine high pressure valve (HPV). When an engine is
selected as the bleed air source, the ACSC determines whether the system will bleed
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