Engines

Question 1

When is the FADEC powered?

Answer 1

The accessory gearbox operates the FADEC alternator to supply the FADEC when N3 is above 8 %.
On ground, with the ENG MASTER lever set to OFF, the electrical network of the aircraft supplies the FADEC for 15 min.
When the flight crew sets the ENG FADEC GND PWR pb to ON, the electrical network of the aircraft supplies the FADEC for 15 min

Question 2

Is reverse thrust electrically or hydraulically engaged?

Answer 2

The Electric Thrust Reverser Actuation System (ETRAS) operates and locks the translating cowls

Question 3

How does FADEC work on manual engine start?

Answer 3

During a manual start, the FADEC uses both igniters when the flight crew sets the ENG MASTER lever to ON.
The FADEC automatically stops the ignition at the end of the start sequence, when N3 reaches approximately 50 %

Question 4

During the start sequence, what closes the start valve?

Answer 4

When N3 reaches 48 %, the FADEC closes the engine start valve (in Flight: if the FADEC previously opened it)