LOS ANGELES – Failure to perform a routine maintenance check caused the shutdown of an air traffic communications system serving a large swath of the West, resulting in several close calls in the skies, the FAA and a union official said Wednesday.
In at least five cases, aircraft in the sky passed dangerously close to each other Tuesday night after the shutdown knocked out radio contact between pilots and air traffic controllers, the union official said.
Two flights “were almost near-midair collisions,” said Hamid Ghaffari, local president of the National Air Traffic Controllers Association.
The Federal Aviation Administration said it was looking into five instances in which planes apparently got too close to each other during the communications blackout.
In a statement, the agency said radio contact failed but radar coverage remained fully operational and aircraft were safely handed off to other air traffic control facilities.
The center hit by the blackout controls airspace for a vast region that encompasses California, Arizona, Nevada and parts of Utah.
“A required 30-day maintenance check on the primary radio and voice communications system was not performed,” the agency said. “This system turns off if this check is not performed.”
It said a backup system also failed because it “was not configured properly to ensure its availability in the event of the primary system’s failure.”
Three workers filed injury claims, saying they were traumatized by seeing flights veer toward one another on radar without being able to do anything, he said.
Airport operations were back to normal Wednesday following the radio failure at an FAA center at Palmdale, north of Los Angeles.
Under FAA rules, planes must remain at least five miles apart horizontally and 2,000 feet vertically. In at least five cases, that safety bubble was violated, and in two cases planes came within about two miles of each other, Ghaffari said.
On-board safety equipment that includes a collision-avoidance system helped avert disaster, Ghaffari said.
“That was the hero of the night,” he said.
Talk to us
> Give us your news tips.
> Send us a letter to the editor.
> More Herald contact information.
