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engage the air turbine starter.
POWER PLANT
Description
Vol. 2 19−10−12
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
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 SUMMARY 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, 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
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
ENGINE STARTING SYSTEM (CONT'D)
Air Turbine Starter
The air turbine starter is mounted on the accessory gearbox. The air turbine starter 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 air turbine starter 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
switch/light; and
• At 55% N2 rpm, the start control valve is de-energized and the air turbine starter
disengages.
The air turbine starter is subject to the following starter engagement limits:
STARTER ENGAGEMENT LIMITATIONS
START # ENGAGEMENT TIME COOLING PERIOD
1 30 seconds none
2 30 seconds none
3 & subsequent 30 seconds 5 minutes
POWER PLANT
Description
Vol. 2 19−10−14
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
ENGINE STARTING SYSTEM (CONT'D)
DRY MOTORING # ENGAGEMENT TIME COOLING PERIOD
1 90 seconds 5 minutes
2 & subsequent 30 seconds 5 minutes
Dry-Motoring
Dry-motoring is performed with ignition off and thrust levers at SHUT OFF.
Dry-motoring may be used for engine ground starts and engine airstarts.
IGNITION SYSTEM
Description
Two independent alternating current (AC) ignition systems are provided for each engine. Each
ignition system consists of one ignition exciter and one igniter plug.
Ignition system A is powered by the AC essential bus. Ignition system B is powered by the battery
bus through a static inverter.
Operation
There are three ignition system modes:
Normal – Prior to engine start, the ignition is armed by selecting either A or B ignition switch/light
at the START/IGNITION panel. When an ignition system is armed, the corresponding white ARM
light illuminates. Ignition is energized upon starter engagement, and is de-energized at starter
cutout (55% N2). While an ignition system is energized, the corresponding green ON light
illuminates, and the IGNITION A (B) advisory EICAS message appears.
　
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