[simpits-tech] Tech Help Needed: Aircraft Power

[Roy Coates]

On Mon, 18 Aug 2003, Darren Beaumont wrote:

> Roy,
>
> The only bit of advice is to dig out the wiring manual/diagrams before
> touching anything.  I'd expect it will not be as simple as removing the
> PDU and powering the individual busbar(s), as it may be necessary to tie
> some of the busbars together.

I stopped by the plane on my way home tonight, and opening up the main
electronics bay shows - the PDU's are missing!  The gen controllers and
diag station is there, but the bus cables are just hanging in free air.

I've carefully read all the manuals concerning both AC and DC power
systems and the two PDU's are indeed the key to then entire system. It
would seem that by removing the PDU's I can safely apply power only to
those busbar's I need with some safety.

I brought the wiring diagrams home, but since these consist of 4 manuals
of A3 size and about 9" think in total - it might take me a while ;)


> Have you tried isolating the systems you don't want powered up by
> pulling the relevant circuit breakers?

I can't rely on that, with the breakers located either side of the
flight-deck entrance it would be too easy for someone to accidnetally push
one or more back in.


> Re the inverters, just remove the connectors, or pull the circuit
> breakers.

Having identified the inverters, it is indeed a simple case of pulling the
connector from the box, a 2-minute job.

Cheers Darren.

Roy.