Originally Posted by
Dave Therhino
There have been several events of loss of all normal AC power on the 737NG. Also at least two on the 767 I can recall.
Generator failures are almost never completely independent. Failure of the first one usually causes an increase in load on the remaining generator(s), often to their load limit, which can cause another generator or switching equipment to fail. Also, on an NG the third source is the APU generator. APU inflight start reliability is at best in the 99% range.
Also, adding to the list of what doesn’t work when all normal ac power is lost, add the fuel pumps. You are on suction feed if AC power is lost. If you are at high altitude with warm or unweathered fuel when this happens, you may experience a flame out on both engjnes.
BS
Name one.
I have flown many thousands of hours on the NG and never heard of one.
The NG has one of the simplest and most robust electrical systems there is.
I’ve been hit several times by lightning and it was not an issue.
Just lots of paperwork.