Safety Board said Friday that officials will work over the next year to determine what caused the Cessna 550 Citation to crash just before 4 a.m. local time Thursday.

A critical weather observation system at Montgomery Field Airport was malfunctioning for days before the plane crash early Thursday morning. The FAA did not issue an advance notice about the outage, records show.

In the dark stillness of night, a quiet, tree-lined street in a San Diego neighborhood was plunged into tragedy when a plane clipped a main power line and crashed onto the street — turning cars into fireballs and sending hundreds of residents fleeing in a haze of smoke and confusion.