During a news conference Friday, an NTSB investigator said a technical glitch at Montgomery-Gibbs Executive Airport knocked out a system that gives weather updates to approaching pilots.

A small plane crashed into a neighborhood in Simi Valley on May 3 killing both people and a dog aboard the aircraft and igniting two homes, but no one was reported hurt on the ground despite residents being inside the residences at the time. The community is located nearly 50 miles (80 kilometers) northwest of Los Angeles.

Dense fog had rolled into the area around the time the plane was approaching the airport. Visibility was at half a mile at 3:55 a.m. and had dropped to a quarter of a mile just after 4 a.m. in the area around Marine Corps Air Station Miramar, which is just a few miles north of the crash site, according to the National Weather Service.