thanks rudderrudderrat.
So (on A320 )assuming the right pack is inop and switch off, and we taking off with the left pack only ( plz note, its pack not bleed) WITHOUT using the APU, which engine bleed is powering the 1 and only pack? do they both share the load?
Otherwise, wouldn't there be some asymm thrust?
Edit:sorry forgot to specify a/c type. Its A320.

2nd Edit : Forgot to include without using APU.