Many, like my seneca III have an emergency avionics bus switch.

Now I am curious and will look around ifr certified aircraft and see
which ones do not have one.




wrote:
The battery Contactor on MOST GA airplanes is
'powered' ( grounded) by ONE wire!

You GAMBLE your life and you Pax's life in IFR conditions by
way of:

One Battery, One battery Contactor, ONE primary Battery buss wire,
One contactor control wire, a few Ring terminal lugs, One
Master Switch.

When the Battery contactor circuit opens / fails you WILL loose
the alternator because the battery acts as a capacitor to smooth out
DC power fluctuations, spikes, and AC ripple : the alternator
field current will go wild and the overvoltage regulator will cut
out. With out field current you have no Alternator!

In IFR You have HAD IT! NO DC power!

Wonder how many 'good' pilots have been killed in IFR with a total
power outage?? no Radio distress call because of no electrical
power!........ no radios, no lights, no auto pilot, no
transponder, no turn and bank indicator ( Partial panel capability
lost) ......... everyone wonders what happened????

Seconds to live, ....... because of ONE........ get it!!! ONE
common point failure of an essential IFR system!