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DC electrical power and air from the bleed-air manifold are required to open the start valve and engage the air turbine start-er. The bleed-air manifold can be pressurized by the:
-APU bleed air
-Ground cart HP bleed air
-Opposite engine bleed air (crossbleed)
The pneumatic pressure from any of the three pneumatic sources is displayed on the ECS synoptic page.
ENGINE CONTROL PANEL
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Volume 2 Flight Crew Operating Manual May 06/2005 CSP 100-6 REV 2
18-01-14 ENGINE STARTING SYSTEM (Cont)
COMPONENTS AND OPERATION STARTER CONTROL VALVE
The starter control valve is mounted adjacent to the air turbine starter (ATS) inside the engine nacelle. The valve normally requires 28 VDC power and pneumatic pressure to open. When the L (R) starter switch on the ENGINE control panel is moved to the START position, the FADEC supplies 28 VDC power to energize the solenoid. This allows pneumatic pres-sure to open the valve and engage the air turbine starter.
When N2 rpm is > 50%, the FADEC removes power from the solenoid, the start valve closes and the air turbine starter disengages.
AIR TURBINE STARTER (ATS)
The air turbine starter is mounted on the accessory gearbox. The ATS converts pneumatic energy into mechanical motion. The starter, through a sprag clutch, mechanically engages the accessory gearbox and assists in accelerating the engine to idle speed. During the start sequence, the start valve closes and the ATS disengages when the N2 reaches or exceeds 46.2% or the OFF position is selected on the throttle quadrant assembly panel.
For subsequent starts, the starter sprag clutch does not require that the engine rotation be completely stopped before engag-ing the starter. The ATS may be engaged at any rpm up to 50% rpm (starter cutout speed).
START SEQUENCE
Each engine has a set of L (R) STARTER switches on the ENGINE control panel and a set of RUN/OFF switches on the throttle quadrant panel.
L ENGINE
R ENGINE RUN
RUN
OFF OFF
OFF
CRANK START
OFF
CRANK START
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To start the engines, set the related engine switch to RUN. This turns on the fuel DC boost pump and operates the ECU start cycle. Set START switch to the START position and hold it for one second to operate the usual ground or air start. When the applicable engine RUN position is selected on the TQA and the starter switch is set to START the: -The start valve on the associated engine opens to allow pressure from the bleed air manifold to engage the ATS When the engine’s N2 reaches 46.25%, the: -The start valve closes and the ATS disengages If the start valve fails to close after achieving 50% N2, a L (R) STARTER FAIL ON (C) CAS message is shown Refer to the Airplane Flight Manual for starter limits.
May 06/2005 Flight Crew Operating Manual Volume 2 REV 2 CSP 100-6
18-01-15 ENGINE STARTING SYSTEM (Cont)
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