Engines (IAE) Flashcards
When does the self powering of the FADEC start?
IAE Engines
The FADEC system is self-powered above 10% N2. In case of a FADEC self-power loss the aircraft electrical network automatically supplies the FADEC.
What is the function of the fuel metering valve (FMV)?
IAE Engines
The FMV controls the fuel flow protects against overspeeding controls the shut off valve and supplies high pressure fuel to the various actuators.
How does the ignition system work?
IAE Engines
The ignition system is used to start the engine on ground and to restart it in flight. it consists of two identical independent circuits for each engine normally controlled by the FADEC channel A with channel B on standby. Each FADEC channel can control both igniters.
The FADEC system performs the following functions…
IAE Engines
Control of gas generator protection against engine exceeding limits power management automatic engine starting sequence manual starting sequence thrust reverser control fuel recirculation control transmission of engine parameters and engine monitoring information detection isolation and recording of failures FADEC cooling and protection against fan flutter.
How does the engine start system work?
IAE Engines
The engine start system consists of an air turbine starter and a start valve. The start valve admits air supplied by the pneumatic system to operate the starter. The FADEC controls the start valve electrically. If electrical control fails when the aircraft is on the ground a handle allows the start valve to operate manually.
How many thrust lever positions are there and how are they labeled?
(IAE Engines)
There are 5 thrust lever positions: TO/GA, FLX/MCT, CL, IDLE and MAX REV.
Is a N1 mode available?
IAE Engines
If no EPR is available (either sensed or computed) the affected FADEC will automatically revert to N1 mode.
How does the protection against fan flutter work?
IAE Engines
When on ground at low speed the EEC protects against fan flutter. In so doing the EEC prevents the engine from being stabilized between an approximate range of 60% to 74% N1 (depending on the outside air temperature). Therefore during engine acceleration on ground the pilot may notice a non-linear thrust response to thrust lever movement.
What are the main components of the oil system?
IAE Engines
The oil system contains the oil tank the lube and scavenge pump modules the fuel/oil heat and air/oil heat exchangers the filters chip detectors pressure relief and bypass valves.
How many channels has the FADEC?
IAE Engines
The FADEC has two-channel redundancy with one channel active and one channel in standby. If one channel fails the other automatically takes control.
What is the purpose of approach idle?
IAE Engines
Approach idle allows the engine to accelerate rapidly from idle to go-around thrust.
When does the oil temperature indication become amber?
IAE Engines
These numbers are normally green. They become amber and an associated warning appears on the ECAM if the temperature exceeds 165°C or exceeds 155°C for more than 15 minutes or is below -10°C.
What are the idle modes of the FADEC?
IAE Engines
Modulated idle approach idle and reverse idle.
What is the main parameter to control the engine thrust?
IAE Engines
The engine thrust setting is made through the control of the Engine Pressure Ratio (EPR).
What is the function of the fuel oil heat exchanger?
IAE Engines
The fuel oil heat exchanger enables fuel to be heated by the oil to reduce temperature of the oil and prevent fuel icing.
