Starting engine -- Bleed air

[Claude Troncy 4]

Bonjour,

May be someone can give me a clue !

Is the bleed air provided by one engine running is enough to start the other ? It does not seem possible. I always have to start the APU, to give me more bleed air to start the second engine.

Merci

Claude

[Budbud 227]

Hello,

If you perform a cross bleed start (starting an engine with the bleed air from the other engine), you have to increase a little the rpm of the running engine to get at least 30psi for the engine start. (I usually find that 28-30% N1 is enough to get the correct pressure)

Check also that the isolation valve is set to open and both packs are off.

[Claude Troncy 4]

 

1 hour ago, Budbud said:

Hello,

If you perform a cross bleed start (starting an engine with the bleed air from the other engine), you have to increase a little the rpm of the running engine to get at least 30psi for the engine start. (I usually find that 28-30% N1 is enough to get the correct pressure)

Check also that the isolation valve is set to open and both packs are off.

Thanks Romain for the clue.

Just by increase N1, on the engine running, solve my problem.

Cheers

Claude

[andreh 125]

I believe it's covered somewhere in this video

 

 

 

[Claude Troncy 4]

 

26 minutes ago, andreh said:

I believe it's covered somewhere in this video

Thank you Andre, it is covered around 10.00

Cheers

Claude