twelve o'clock
Extension of the motors with no resultant air friction gave a longer pivot arm and consequently better efficiency . Mac pressed the `` Aux . Steer '' stud and immediately three amber lights winked on in their respective instrument consoles . Carl Logan fired the twelve o'clock motor briefly -- only it did n't fire . The change in momentum would n't be much in any case , but it was always perceptible by feel and by instrument . There was no change . Logan tried the firing circuit again , and again .