Vol. 1 19--00--1
REV 56, Jan 31/03
PNEUMATIC
Table of Contents
Flight Crew Operating Manual
CSP A--013
MASTER
CHAPTER 19 -- PNEUMATIC
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--1
High Pressure Ground Air Connection 19--20--6
System Circuit Breakers 19--20--7
BLEED AIR LEAK DETECTION 19--30
Bleed Air Leak Detection 19--30--1
System Circuit Breakers 19--30--5
LIST OF ILLUSTRATIONS
INTRODUCTION
Figure 19--10--1 Bleed Air Distribution 19--10--2
BLEED AIR SYSTEM
Figure 19--20--1 Bleed Air System Schematic 19--20--2
Figure 19--20--2 Bleed Air System Controls 19--20--3
Figure 19--20--3 ECS Page 19--20--4
Figure 19--20--4 Bleed Air System EICAS Indications 19--20--5
BLEED AIR LEAK DETECTION
Figure 19--30--1 Bleed Air Leak Detection and Warning System 19--30--2
Figure 19--30--2 Bleed Air System Control Panel 19--30--3
Figure 19--30--3 Bleed Air Leak Detection --
Loop EICAS Indications 19--30--4
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PNEUMATIC
Table of Contents
Flight Crew Operating Manual MASTER
CSP A--013
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Vol. 1 19--10--1
REV 56, Jan 31/03
PNEUMATIC
Introduction
Flight Crew Operating Manual
CSP A--013
MASTER
1. INTRODUCTION
The pneumatic system consists of two separate bleed air systems.
S Low pressure (10th stage) bleed air system
S High pressure (14th stage) bleed air system.
The low pressure system is supplied bleed air from the 10th stage of both engine
compressors. The 10th stage air is used to supply air for the left and right environmental
control systems, for pressurization and for engine starting. The APU bleed air system or
high pressure air from a ground air source can also be used to meet these requirements.
Normally, each engine supplies the user system on the respective side but, if the 10th stage
bleed air supply is lost from one side, a bleed isolation valve is provided for cross--bleeding
from the operable side.
The environmental control system can also receive conditioned air from a ground air cart.
<0007>
The high pressure system is supplied hot bleed air from the 14th stage of both engine
compressors. The 14th stage bleed air is used to supply the requirements of the wing and
cowl anti--ice systems and for thrust reverser operations. Normally, each engine supplies
the user system on the respective side but, if the 14th stage bleed air supply is lost from one
side, a wing isolation valve is provided for cross--bleeding from the operable side.
The bleed air leak detection system monitors the pneumatic ducting for high temperature
bleed air leaks. When the system detects a leak, visual warnings are displayed and aural
warnings sound to alert the crew to turn off the affected system.
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PNEUMATIC
Introduction
Flight Crew Operating Manual MASTER
CSP A--013
Bleed Air Distribution
Figure 19---10---1
LEFT AND RIGHT
10 TH STAGE
BLEED AIR
CABIN PRESSURE
ENGINE STARTING
AIR CONDITIONING
GROUND
SOURCE
APU
LEFT AND RIGHT
14 TH STAGE
BLEED AIR
ENGINE COWL
ANTI--ICE
WING ANTI--ICE
THRUST REVERSERS
BLEED AIR SOURCES
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PNEUMATIC
Bleed Air System
Flight Crew Operating Manual
CSP A--013
MASTER
1. BLEED AIR SYSTEM
A. Engine Bleed Air
The engine supplies both low (10th stage) and high (14th stage) pressure bleed air
from the compressors to the low and high pressure manifolds.
(1) Low Pressure (10th stage)
The low pressure bleed air manifold receives pressurized air from:
S The engine compressors 10th stage or,
S The APU compressor or,
S From an external ground air source.
Low pressure operated aircraft systems include engine starting, air-conditioning
and pressurization. Bleed air to the low pressure manifold is controlled by 10TH
STAGE bleed air switchlights on the BLEED AIR control panel. The switchlights
operate the respective L/R 10th stage bleed air shutoff valves. The left and right
systems normally operate independently but can be connected by opening the
bleed isolation valve. The bleed isolation valve is controlled by the 10TH STAGE
ISOL switchlight on the BLEED AIR control panel.
(2) High Pressure (14th stage)
The high pressure bleed air manifold receives pressurized air from the engine
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