The NTSB is asking the FAA to inform domestic and foreign airframers “about the circumstances of this accident,” and to advise them to consider the possibility that an aircraft’s maximum lift coefficient in ground effect could be, in contrast to common belief and practice, lower than its maximum lift coefficient at altitude, a finding made by Gulfstream in its post-crash analysis.

The board also is asking the FAA to work with the FTSC to issue updated operating flight test guidance to manufacturers, based on the report, and develop flight test safety guidelines based on best practices in aviation safety management.

Only two recommendations were addressed to Gulfstream, one of which is to commission an audit by qualified safety experts before its next flight test campaign is launched, focusing on the weaknesses brought out in the NTSB report.

“We recognize the safety action they took [after] the accident,” says Deborah Hersman, NTSB chairman.