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Oil Replenishment System
Figure 19−10−6
POWER PLANT
Description
Vol. 2 19−10−10
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENGINE BLEED AIR SYSTEM
Description
Engine bleed air extracted from the 7th, 10th and 14th stages of the engine compressor and used
by the airplane systems below:
• 7th stage: Pressurizing of oil seals and the venting of engine sumps in the lubrication
system.
• 10th stage: Pneumatic supply to the air conditioning and pressurization systems, and
engine starting.
• 14th stage: Pneumatic supply to the engine cowl and wing anti-ice system, or thrust
reverser systems.
Components and Operation
Ducting and check valves are used to direct the flow of bleed air from the engine to the 10th- and
14th-stage bleed air manifolds. The nacelle and pylon ducts are monitored for bleed air leakage by
the engine fire and jet pipe overheat detection systems.
For additional information, refer to Chapter 9, Fire Protection, and Chapter 18, Pneumatic System.
POWER PLANT
Description
Vol. 2 19−10−11
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENGINE BLEED AIR SYSTEM (CONT'D)
Engine Bleed Air System − Schematic
Figure 19−10−7
ENGINE STARTING SYSTEM
Description
The starting system consists of the starter control valve and the air turbine starter (ATS). The air
turbine starter drives the accessory gearbox, which in turn drives the N2 core section. DC electrical
power and air from the 10th-stage bleed air manifold are required to open the starter control valve
and engage the air turbine starter.
POWER PLANT
Description
Vol. 2 19−10−12
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENGINE STARTING SYSTEM (CONT'D)
The 10th-stage bleed air manifold can pressurized by the:
• APU;
• External air cart; or
• 10th-stage bleed air from the operating engine (crossbleed).
The following minimum bleed air pressures should be available for an engine start:
• APU – 40 psi;
• External air start cart – 45 psi; or
• Engine crossbleed – 60 psi (approximately 85% N2).
L(R) 10th-stage bleed air manifold pressure is displayed on the EICAS status page.
CAUTION
During an engine crossbleed air start, ensure that intake and exhaust
areas of the operating engine are secure. When starting engines in
close quarters, consideration should be given to the effects of jet
blast.
Starting System − Schematic
Figure 19−10−8
Components and Operation
Starter Control Valve
The starter control valve is mounted next to the air turbine starter (ATS) inside the engine
nacelle. It controls the initial rate of engine acceleration upon engagement of the starter by
regulating the amount of air supplied to the starter. The starter control valve is controlled by the
START and STOP switches on the START/IGNITION panel.
POWER PLANT
Description
Vol. 2 19−10−13
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENGINE STARTING SYSTEM (CONT'D)
Air Turbine Starter (ATS)
The air turbine starter (ATS) is mounted on the accessory gearbox. The ATS converts
pneumatic energy into mechanical motion. The starter mechanically engages the accessory
gearbox through a clutch, and accelerates the N2 section of the power plant. The starter is
capable of dry-motoring the engine up to approximately 28% N2 rpm. During a normal start, the
starter remains engaged until 55% N2 to assist the engine in accelerating to idle speed. At 55%
N2 rpm, the starter control valve closes and the air turbine starter disengages.
For subsequent starts or relights, the starter clutch does not require that engine rotation be
completely stopped before engaging the starter. The ATS may be engaged at any rpm up to
55% N2 rpm (starter cutout speed).
Starter disengagement may be commanded at any time by pressing the engine STOP
switch/light.
Engine Start/Ignition Panel
Figure 19−10−9
Start Sequence
Each engine has a set of START and STOP switch/lights on the ENGINE START/IGNITION
panel. When the engine START switch/light is pressed, the following occurs:
• Left, right and isolation 10th-stage bleed air SOVs open;
• Starter control valve on the associated engine opens to allow pressure from the
10th-stage manifold to engage the air turbine starter;
• When the starter control valve opens, a white light illuminates in the associated START
　
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