Bleed Air

Question 1

When is X-bleed Valve shut in auto?

Answer 1

Normally closed. Open at eng start, on ground when both eng & APU off, on ground when ground source used.
When APU bleed valve selected open, in case any engine bleed air system is closed, in case any pack is declared inop.

Question 2

HP Bleed Valve on SD page?

Answer 2

At low engine thrust air is bled from the HP compressor, through the HP valve.
Green Inline=The HP valve is open.