16 Questions
What are the two methods for obtaining the required airflow for airstarts?
Bleed air supplied by the APU (assisted airstart) or by air flowing through the engine (windmilling start).
How are the ignition requirements met for engine starting?
Ignition requirements are automatic or are met by continuous ignition, which is selected by the flight crew.
What must the power levers be in during engine starting, and what happens if they are not in this position?
The power levers must be in the idle position during engine starting. If a power lever is forward of the idle position during engine start, a (caution) CAS message will be displayed to alert the crew.
What is the Starter Air Valve (SAV) used for in the engine starting system?
The Starter Air Valve (SAV) is part of the engine starting system and is used to control the flow of air for starting the engine.
What is the function of the Air Turbine Starter (ATS) in the engine starting system?
The Air Turbine Starter (ATS) is used to turn the High-Pressure (HP) compressor through the accessory gearbox.
What are the options for selecting start and cranking cycles in the engine starting system?
The Full Authority Digital Engine Control (FADEC) can select normal (automatic) ground and airstart, alternate (manual) ground and airstart, and wet or dry cranking.
What triggers the EEC to determine whether a starter-assisted or windmill start should be performed during an air start?
Computed airspeed
When does the blue SVO icon illuminate on the Engine Instrument Display Unit?
When the Starter Air Valve (SAV) passes through 7° on its way open
What does the flashing amber SVO icon indicate on the engine instruments?
That the start valve was commanded closed by the EEC but is still in the open position
When is the (caution) CAS message displayed regarding the SAV?
When the SAV remains closed after the EEC commands the valve to open
What is the duty cycle for the starter during engine starts?
Three start cycles with a maximum of three minutes per start cycle
What is the maximum HP rpm speed at which the starter may be re-engaged?
42% HP rpm
What is the limitation for the starter duty cycle as mentioned in the Flight Manual?
Three start cycles with a maximum of three minutes per start cycle
How can the start sequences be terminated?
Automatically under normal condition by the EEC at approximately 42% HP RPM, automatically under abnormal conditions at any time by the EEC, and manually by selection of the ENG START switch to OFF
When is the SAV control set to manual?
During alternate (manual) engine start.
What should the flight crew do if the SAV fails to close after engine start?
Shut off the bleed air supply to the SAV to prevent damage to the starter air turbine.
Test your knowledge about the starter air duct of an aircraft engine, including its components, installation, and operational summary. This quiz covers the functions of the starting system as well.
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