Martinlest wrote:I am looking at the 737-400, but I guess that 737NG are the same in this respect (?)
I'd firstly like to ask what the functions of the various positions of the DC knob on the O/H panel actually are (STBY PWR; BAT BUS; BAT; TR1; TR2; TR3 & TEST). When would each of those positions be selected by the pilots?
What are 'normal operations' for DC power? Is the knob left on Standby, or is it switched to BAT when the a/c is powered (that is, with APU running? Or only with engines running and generators on?)? And when engines are running, to TR1, 2 or 3?
Finally, is there a different procedure for DC power if power for the aircraft is being obtained from a GPU, and if the APU is running? I tend (I am not a real-world pilot I should add! Probably very obvious!) to run my initial cockpit setup powered from the GPU and start the APU a little later (saves a bit of virtual fuel!)...
Hope the questions make sense..
Moving the knob to different positions does not alter anything on the airplane itself, the selector just picks up the DC voltage from the selected bus and indicates the voltage on the display above the knob.
Martinlest wrote:I am still unsure what the systems actually are however (apart from obvious ones like BAT, GRD PWR or APU of course). TR1, 2 and 3 are...? And BAT BUS? (I remember the Bat Car from my childhood TV days, but the Bat Bus??)...
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