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LCV
Left
Fuselage
Right
Fuselage
External
Air Source
Bleed
Air
Ports
10th-Stage
Bleed Air
14th-Stage
Bleed Air
LEGEND
ISOL
P604_18_008
R ACU
L T/R
PDU
L
ATS
R
ATS
R T/R
PDU
POWER PLANT
18-14 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
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.
The 10th-stage bleed air manifold can be pressurized by the:
• APU
• external air cart
• 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
• Engine crossbleed - 60 psi (approximately 85% N2).
L(R)10th-stage bleed air manifold pressure is displayed on the EICAS status page.
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 18-8
CAUTION
10th-
STG
10th-
STG
10th
ISOL
L 10th
SOV
R 10th
SOV
LCV
APU
L ACU R ACU
External
Air Source
P604_18_003
ATS ATS
Starter
Control
Valve
Starter
Control
Valve
POWER PLANT
For Training Purposes Only
May 03
18-15
P I LOT T R A I N I N G GU I D E
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.
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 18-9
IGNITION
S
T
A
R
T
S
T
A
R
T
S
T
O
P
S
T
O
P
CONT
A
B
ARM
ON
ARM
ON
STOP STOP
START
L-ENG-R
START
ON
P604_18_022
POWER PLANT
18-16 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
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
• at 55% N2 rpm, the start control valve is de-energized and the ATS disengages.
The ATS is subject to the following starter engagement limits:
Starter Engagement Limitations
Table 18-1
Dry-Motoring
Dry-motoring is performed with ignition off and thrust levers at SHUTOFF.
Dry-motoring may be used for engine ground starts and engine airstarts.
START # ENGAGEMENT TIME COOLING PERIOD
12
3 & subsequent
30 seconds
30 seconds
30 seconds
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航空翻译 www.aviation.cn
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