The FAA said seats on hundreds of Boeing 737 MAX jets may require inspections in case they were incorrectly installed and needed to be fixed.
Boeing has reached an agreement in principle with the Department of Justice to avoid prosecution in the case over two deadly 737 Max crashes.
The attorneys said the family members are outraged by the decision and that they will object to the decision in court.
Boeing has reached a last-minute settlement to avoid a civil trial in a deadly Ethiopian Airlines plane crash.
The two crashes in October 2018 and March 2019 killed 346 people in total.
The company and its workers have faced significant financial losses during the nearly six-week strike.