Now that I got to thinking about it, in a pinch you could start a 727 without even the battery being on, that's right, no power at all. All you need is air (however this is a long drawn out procedure I've had explained to me by PFEs who flew in war zones). Realistically though, you could start without aircraft electrics but you would need ground electrics.
Last edited by aviatorhi; 17th January 2011 at 05:26.