Hi,

just bought the 757 3 days ago and i have some question about the behavior of the aircraft.
1. Engine Start
I start the left engine first, with APU Bleed Air.
After the start is finished, i activate the isolation valve switch. Then i cannot start the right engine until i activate the left engine bleed air.
When i just open the isolation valve switch, without the left engine bleed, it wont start.
Is this normal?

2. MCP Altitude
Is there any Altitude override knob, to cancel vnav altitude restriction? I only found the speed override button.