Toruk Macto the ‘too low gear’ warning requires kit unlikely to be fitted to an older King Air.
However if full flap is selected and the gear is not down, the warning horn will make quite a racket and a bloody huge red light illuminates in the gear handle. Although it is an old design with a few ‘gotchas’ in the cockpit, as far as the gear system is concerned, Beech did their best to pilot proof it.
But it appears from the lack of visible damage that the flaps were not in the landing position either.