The EEC protects the engine against fan instability. The fan instability depends on the aircraft speed and fan rotation speed (N1%).
Depending on the aircraft altitude and the aircraft speed, if the FADEC detects overthrust, the FADEC:
The overthrust protection is active when the aircraft is below 16 600 f and the aircraft speed is below M 0.45.
Each engine has one FADEC also called Engine Electronic Controller (EEC). The EEC controls the engine and computes the engine parameters for cockpit indications. Each EEC has _____ redundant channels.
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/A350-Engines-Question-02.jpg)
STARTER ASSISTED OR WINDMILLING START - The FADEC starts the engine via a starter assisted start (i.e. the FADEC automatically opens the engine start valve) if:
Without A/THR, the engine thrust is always limited by the thrust lever position, except when the A.FLOOR protection is active.
The engine thrust is always limited by the thrust lever position, with or without A/THR, except when the A.FLOOR protection is active.
The engines provide bleed air to ensure:
The thrust limit value corresponds to the maximum available thrust of the engine with:
The engine has _____ compressor turbine assemblies:
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/A350-Engines-Question-01.png)
1.The Low Pressure (LP) compressor turbine assembly. 2.The Intermediate Pressure (IP) compressor turbine assembly. 3.The High Pressure (HP) compressor turbine assembly.
On ground during an automatic start sequence, if the FADEC detects that the EGT exceeds the temperature limit:
MANUAL START - The FADEC does not abort an abnormal manual start, except if the starter is engaged above the maximum engagement speed.
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On ground, with the ENG MASTER lever set to OFF, the electrical network of the aircraft supplies the FADEC for _____.
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/A350-Engines-Question-03.png)
A/THR INSTINCTIVE DISCONNECT PB - Pressing the A/THR instinctive disconnect pb only disconnects the A/THR.
Pressing the A/THR instinctive disconnect pb disconnects the A/THR (in flight) and the autobrake (on ground).
The alternator of the FADEC supplies the FADEC when _____
WINDMILLING QUICK RELIGHT FUNCTION - The quick relight is available if N3 is _____.
The FADEC automatically selects continuous ignition with both igniters during a quick relight.
On ground, when pressed, the electrical network of the aircraft supplies the FADEC for _____, when he ENG FIRE pb-sw is not pressed and the FADEC alternator does not supply the FADEC.
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/A350-Engines-Question-18.png)
In the case of overspeed of the LP compressor, or the IP compressor, the FADEC automatically shuts down the engine.
Associated with the following ECAM alerts: ENG 1(2) N1 OVER LIMIT, or ENG 1(2) N2 OVER LIMIT.
EGT LIMIT - The amber line indicates the maximum EGT (i.e. the EGT limit). The EGT limit appear during engine start and during takeoff.
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/A350-Engines-Question-19.png)
The EGT limit does not appear during takeoff, or when the thrust reversers are selected, or if the alpha floor protection is activated.
STARTER ASSISTED OR WINDMILLING START - In the case of a windmilling engine start, the engine uses the relative wind for its own rotation.The FADEC disconnects both associated engine-driven hydraulic pumps in order to increase the relight envelope.
The maximum EGT is _____, during the engine start sequence on ground, or _____, in all other cases.
In case of inadvertent engine shutdown by cycling the ENG MASTER lever to OFF then ON, the FADEC will attempt automatically a relight regardless of the rotary selector position. The initiation of the quick relight function requires the ENG MASTER lever set to ON, then set to OFF, and back to ON within _____.
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