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.

Runway lights and an automated system that provides weather conditions was out of operation at Montgomery-Gibbs Executive Airport before a Cessna crashed into a San Diego neighborhood amid foggy conditions,

On the ground, 100 military families were evacuated from their homes. At least 42 of those families will remain displaced for at least another week.

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.

The situation remained under investigation at midday but had caused no flight delays, the San Diego Regional Airport Authority said.

A Hawaiian Airlines flight at San Diego International Airport was evacuated on May 20 after a passenger made a bomb threat, authorities said.

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.