The National Transportation Safety Board says a cockpit voice recorder was not working on a medical transport plane that crashed in Philadelphia in January and likely had not been working for several years.

Critics say the patchwork system of safety regulations governing massive cargo ships like the one that toppled a Baltimore bridge this week can allow shippers to skirt oversight.

Flight 328 was flying from Denver to Honolulu when the incident occurred, the agency said. Aviation safety experts said the plane appeared to have suffered an uncontained and catastrophic engine failure. Former NTSB Chairman Jim Hall called the incident another example of “cracks in our culture in aviation safety (that) need to be addressed. The last fatality on a U.S. airline flight involved such an engine failure on a Southwest Airlines flight from New York to Dallas in April 2018. In 2010, a Qantas Airbus A380 suffered a frightening uncontained engine failure shortly after takeoff from Singapore.

FILE - In this Jan. 1, 2021 file photo, The Amtrak Metropolitan Lounge overlooks the newly-completed Moynihan Train Hall in New York. Two major railroad workers unions have asked the Department of Homeland Security to beef up security on Amtrak and other passenger rail lines, including by creating a no-ride list akin to the no-fly list that prevents people identified as risks from boarding planes. The unions said Wednesday, Jan. 13, 2021, that tougher security measures are needed after last week's riot at the U.S. Capitol because people who took part in the insurrection that were placed on the no-fly list may turn to railroads for transportation. – Two major railroad workers unions have asked the Department of Homeland Security to beef up security on Amtrak and other passenger lines, including by creating a no-ride list akin to the no-fly list that prevents people identified as risks from boarding planes. The unions also asked the Federal Railroad Administration to intervene and require more security.