Cairo, Ramadan 8, 1437, Jun 13, 2016, SPA -- The flight data recorders from an EgyptAir jet that crashed in the Mediterranean last month are expected to stop emitting signals on June 24, and search boats are working against the clock to retrieve them, Egyptian investigators said on Monday. Without the "black boxes", investigators say there is not enough information to explain why flight MS804 crashed on May 19, killing all 66 people on board. The Egyptian-led investigation committee said in a statement that it had accepted a request by the United States' National Transportation Safety Board (NTSB) to have a representative join the investigation team. The plane's engines were built by a consortium led by the U.S. firm Pratt & Whitney. The country where the engines were built is often invited to take part in an air crash investigation, although it is not compulsory, Reuters reported. Investigators also said on Monday that radar imagery obtained from the Egyptian military confirmed previous reports based on Greek and British radar data indicating that the plane had swerved in mid-air before crashing. --SPA 22:40 LOCAL TIME 19:40 GMT www.spa.gov.sa/w