[expatpat]

Well, there are multiple problems here, but the pilot believed after reading the 'manual' that the APU would continue to power the sensors with the engine off. That is a perfectly normal thing to expect, and the system handbook should have highlighted a deviation from this.

The lack of electricity would have not been an issue if the pilot had known this. He would not have tried to take off until the gyros were fully up to speed, and no battery or capacitor would be needed.

[Excuse_My_Bellicosity]

I'm sure this mishap caused some tech order changes.