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

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.

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

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

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

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

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

The case is making ripples through the aviation world, with safety experts unaware of any other helicopter crashes that have involved a slackline.

A fatal Arizona helicopter crash involving a high-altitude slackline has renewed scrutiny of the FAA’s NOTAM system ahead of its planned upgrade.

Federal investigators are examining if a slackline was properly authorized following the deadly helicopter crash near Superior that claimed the lives of four people on Friday, ...

Federal investigators recovered the helicopter near Superior and continued examining what led to the crash that left 4 family members dead.