National Transportation Safety Board investigator Carol Hogan examines wreckage on Jan. 27 as part of the NTSB’s investigation of a helicopter crash near Calabasas, Calif., that killed former NBA basketball player Kobe Bryant, his 13-year-old daughter, Gianna, and seven others. (James Anderson/National Transportation Safety Board via AP, file)

Federal safety investigators bypassed aviation regulators on Tuesday and urged leading helicopter manufacturers to install so-called black boxes that would help determine the cause of crashes such as the one that killed former NBA star Kobe Bryant.

The National Transportation Safety Board appealed directly to six manufacturers after the Federal Aviation Administration failed to act on the board’s recommendations to require the devices on most helicopters. The safety board said turbine-powered helicopters should record data, audio and images during flight.

The NTSB identified seven crash investigations between 2011 and 2017 in which it said the lack of recorder information slowed its ability to find potential safety issues.

“The more information we have, the better we can understand not only the circumstances of a crash, but what can be done to prevent future accidents,” said Dana Schulze, director of aviation safety for the NTSB.

The NTSB’s move is highly unusual. The board investigates accidents but has no authority to make regulations; that falls to the FAA. The board said it recommended flight-data and cockpit-voice recorders in 2013 and 2015, but the FAA did not act. The request for image-recording capability is new.

The FAA has required flight-data recorders on helicopter ambulances since 2018. In a statement Tuesday, the FAA said it encourages other helicopter operators to use data-gathering systems and analyze the information to improve safety.

In 2016, then-FAA Administrator Michael Huerta agreed that crash-resistant recorder systems provide additional information about the actions of helicopters and crews but said the agency would not require them because it couldn’t calculate a cost-benefit ratio.

“In today’s rulemaking environment, we have no way of estimating the number of lives that could be saved or the number of future accidents that could be prevented with the use of this additional data,” Huerta told the NTSB. He said the FAA decided instead to encourage manufacturers to add more recorders to their aircraft, and some do.

The NTSB made its request Tuesday to Sikorsky, Airbus Helicopters, Bell, Leonardo, MD Helicopters and Robinson. The companies did not immediately comment.

Sikorsky manufactured the helicopter that crashed in January near Calabasas, California, killing Bryant, his daughter and seven others.