How was a thin strip of nylon or polyester webbing stretched between two points to blame in the January crash that killed ...

The people who strung the line - which is used in a sport akin to tightrope walking - had filed an aviation safety notice, raising questions about the air alert system.

A preliminary report reveals the helicopter hit a slackline, a type of webbing, that was stretched across Telegraph Canyon.

Shortly after the crash, another helicopter flew near the slackline, the National Transportation Safety Board investigation ...

The helicopter crashed after it struck a recreational slackline suspended in Telegraph Canyon on Jan. 2, killing all four ...

The NTSB released on Wednesday its preliminary report into the helicopter’s collision with a slackline, including new ...

This article originally published at Helicopter crashes into kilometer-long slackline in Arizona, killing four.

The National Transportation Safety Board released its preliminary report on the Jan. 2 Superior crash that killed four family members on the pilot's wedding day.

Add Yahoo as a preferred source to see more of our stories on Google. A fatal helicopter crash southeast of Phoenix involved a slackline, also known as a highline, which investigators say the aircraft ...

Investigators say a helicopter hit a highline stretched across Telegraph Canyon near Superior, killing four. Here’s what to know.