Chu Chu,
You wrote:
Maybe there was an overload in another piece of equipment powered by the bus, tripping the breaker and preventing it from being (or staying) reset in flight. That piece of equipment might have been shut down by the time the breaker was reset on the ground.
Not very likely, as you by studiing the picture of the CB panel and the system schematics in the preliminary report will see that the CB A1 BAT BUS DISTR is a 25A CB, protecting mainly low power consumers (control systems mostly).
On the picture several CBs associated with these consumers may be identified and their ratings are 1,5 or 2,5A. (Enlarge the pictures).
I find it very remote that consumers of this size would be able to trip a 25A CB - in any case a possible overload in a system should (normaly) trip its own associated CB.
Possible reasons for the trip could be:
- Faulty CB.
- External interference - the CB is situated in a rather exposed position close
to the floor.
I wonder what advice the LOT maintenance gave to the crew.
This accident ought not to be a big puzzle for the investigation board.
Last edited by grebllaw123d; 3rd Dec 2011 at 20:37.