Hi,

What percentage at N2 do you add the fuel and what is the isolation valvue/ what does it do?

 

Thanks Ollie.

On 1/24/2020 at 6:52 PM, ols500 said:

Hi,

What percentage at N2 do you add the fuel and what is the isolation valvue/ what does it do?

 

Thanks Ollie.

Hi Ollie,

You add fuel when N2 stops increasing, also known as maximum motoring speed.

The isolation valve allows crossbleed of air from one side of the air system to the other. When open it permits the APU to supply both engines with starting air, one engine to supply both packs and so on. It can be closed to isolate a fault in one side of the system from the undamaged side.

Thanks Kevin,

Very helpful 🙂

25% N2 or max motoring reach ever is reached first.