Full FAA Chronology at this link.
19600317: A Lockheed Electra lost a wing in turbulent air and crashed near the towns of Tell City and Cannelton, Ind. All 63 persons aboard the Northwest Airlines flight were killed. On March 20, FAA reduced the top cruising speed of the Electra Model 188 series turboprop airliners from 373 to 316 m.p.h., pending determination of the cause. Additional restrictions effective on March 25 included a further cutback in permissible speed (down to 259 m.p.h., or 225 knots) and a series of rigid tests and inspections. These measures seemed warranted by similarities between the Tell City crash and the crash of another Electra in Texas (see September 29, 1959). On April 12, the Civil