Originally Posted by
Ted D Bear
The other factor: 2 x engines = 2 x vacuum pumps and 2 x alternators
Or a fairly standard caravan: one generator, standby alternator and a battery. With G1000 (as an example, other avionics setups also have redundancy equivalent to 2 vac pumps), 2 x ADC, 2 x AHRS. Pretty safe from an electrical/instrument point of view, if not far safer than the flogged out vac system of a 40+yr old twin. PC12s are a similar deal, modern with plenty of redundancy.