Book 3 - Accessory Cooling Flashcards
engine accessory cooling is performed by RAM air through intake louvres in the cowlings or by compressor air
an inducing system is used on the ground, operated by ___, controlled by a pressure ______ valve. compressor delivery air is passed through the louvres, creating a ________ and drawing air into the cowling for cooling
when WOW is de-enegised, the pressure control valve shuts off compressor air for this operation
engine accessory cooling is performed by RAM air through intake louvres in the cowlings or by compressor air
an inducing system is used on the ground, operated by WOW, controlled by a pressure CONTROL valve. compressor delivery air is passed through the louvres, creating a VENTURI and drawing air into the cowling for cooling
when WOW is de-enegised, the pressure control valve shuts off compressor air for this operation
high pressure air is tapped from various ______ of the compressor for various functions like air _________ and pressurisation, anti-___, hydraulic header tank _________, fuel tank ___________, _________ layer control and self contained engine _________ systems
high pressure air is tapped from various STAGES of the compressor for various functions like air CONDITIONING and pressurisation, anti-ICE, hydraulic header tank PRESSURE, fuel tank PRESSURISATION, BOUNDARY layer control and self contained engine STARTING systems
depending on the engine type, accessories can be driven by __________ or _______ or both. the arrangement of the gearing will determine the ___ of the accessories to the engine speed
depending on the engine type, accessories can be driven by COMPRESSOR or TURBINE or both. the arrangement of the gearing will determine the RPM of the accessories to the engine speed
air loss across the tips of the blades the the turbine and compressor reduce the _________ of an engine. the clearances will not be constant because of variations in power requirements, centrifugal loads, engine temps etc
ACC overcomes this. it uses different stage ___________ air as a thermal medium to control expansion and contraction of the casings
it is a function of FADEC
air loss across the tips of the blades the the turbine and compressor reduce the EFFICIENCY of an engine. the clearances will not be constant because of variations in power requirements, centrifugal loads, engine temps etc
ACC overcomes this. it uses different stage COMPRESSOR air as a thermal medium to control expansion and contraction of the casings
it is a function of FADEC
rotor active clearance control involves controlling the expansion of the compressor rotor by the use of hot/cold air and a _______ valve. the valve is hydraulically operated by fuel pressure to deliver the air mixture to the compressor rotor on signals from the FADEC
rotor active clearance control involves controlling the expansion of the compressor rotor by the use of hot/cold air and a MIXER valve. the valve is hydraulically operated by fuel pressure to deliver the air mixture to the compressor rotor on signals from the FADEC
HPTACC and LPTACC (high and low pressure turbine ACC) maintains the turbine tip clearance in a similar way. in this case, the mixer valve directs the air to a ________ pipe surrounding the turbine rotor case
HPTACC and LPTACC (high and low pressure turbine ACC) maintains the turbine tip clearance in a similar way. in this case, the mixer valve directs the air to a MANIFOLD pipe surrounding the turbine rotor case
