1960 — March 17, Northwest Flight 710 right wing failure, crashes near Tell City, IN– 63
— 63 AirDisaster.Com. Accident Database. Accident Synopsis 03171960.
— 63 Aviation Safety Network. Accident Description. Northwest Flight 710, March 17, 1960.
— 63 CAB. AAR. Northwest Airlines…Near Cannelton, Indiana, March 17, 1960.
— 63 Kimura. World Commercial Aircraft Accidents 3rd Ed., 1946-1993, V.1. 4-11-1994, p. 3.6.
— 63 Logansport Press, IN. “Blast Rivals Rail Wreck as Worst State Disaster.” 11-2-1963, 5.
— 63 Time Magazine. “Why This Failure…”, March 28, 1960.
Narrative Information
Civil Aeronautics Board: “At 1525 c.s.t., on March 17, 1960, a Lockheed Electra, model L-188C, N 121US, owned and operated by Northwest Airlines, Inc., crashed approximately six miles from Cannelton, Indiana, after failure of the right wing. All 63 persons on board were killed.
“Flight 710 departed Chicago, Illinois, at 1438 c.s.t., on an intended nonstop flight to Miami, Florida.” (CAB. AAR. Northwest Airlines…Near Cannelton, Indiana, March 17, 1960.)
ASN: “Electra N121US was operating on Northwest Flight 710 from Minneapolis (MSP) to Chicago (MDW) and Miami (MIA). The flight departed Minneapolis at 12:51 and arrived at Midway at 13:55. During the short time the aircraft was on the ground at Chicago, approximately 30 minutes, it was refueled and prepared for continuation of the flight to Miami. The flight departed Chicago at 14:38. At 14:45, the flight reported to the Indianapolis, Indiana, ARTC [Air Route Traffic Control] Center over Milford at 18,000 feet and estimating Scotland, Indiana, at 15:12. At 15:13, Flight 710 reported over Scotland maintaining 18,000 feet and estimating Bowling Green, Kentucky, at 15:35. This was the last radio contact with the flight.
”At 15:25 the two outboard engines and engine support structures, the complete right wing, and the outer portions of the left wing and ailerons separated in flight. The aircraft crashed out of control.” (Aviation Safety Network. Northwest Flight 710, March 17, 1960)
Time: “Fifteen minutes…[after last radio communication] a farmer in the Ohio River town of Tell City, Ind. heard “popping sounds, like shotgun shells or a little louder.” Looking up, he saw the Electra break in two pieces, the right wing looping off in one direction, the rest of the plane plunging toward a soybean field. As the plane smashed into the ground, another explosion ripped it apart, flinging debris and pieces of bodies for hundreds of yards in all directions. In those few moments, all aboard Northwest Airlines Flight 710—57 passengers and six crew members—were killed..
“The plane and its final explosion blew out a smoldering crater 50 ft. wide and 25 ft. deep. Civil Aeronautics Board crash specialists found empty, neatly laced shoes, a stray airmail letter, a bloodstained blouse, a prayer book lying open at the Litany of the Saints (“Lord have mercy on us . . .”). On the branches of nearby trees were towels and shirts, a child’s sunsuit, some underwear—all hanging lifelessly amid the grey, acrid smoke that curled up from the crater for hours afterward.
“As investigators and 200 National Guard troops plowed through the area to collect bits and pieces of the wreckage, they were aware of the possibility that the cause of the crash might never be discovered. There were some similarities to the still unsolved crash of another Electra last September, in which a Braniff plane went to pieces in the air over Buffalo, Texas. In both the Tell City and Buffalo crashes, severe air turbulence had been reported by the airmen aloft in the vicinity. And although Electras have generally performed well, instances of metal fatigue have been reported; Lockheed Aircraft Corp. some time ago recommended mandatory inspection for cracks.” (Time Magazine. “Why This Failure…”, March 28, 1960)
CAB: “The Board determines that the probable cause of this accident was the separation of the right wing in flight due to flutter induced by oscillations of the outboard nacelles. Contributing factors were a reduced stiffness of the structure and the entry of the aircraft into an area of severe clear air turbulence.” (CAB. AAR. Northwest Airlines…Near Cannelton, Indiana, March 17, 1960.)
ASN: “Follow-up/safety actions: Modifications to all Lockheed Electra aircraft which included nacelle-wing improvements.” (Aviation Safety Network, Northwest Flight 710, March 17, 1960)
Sources
AirDisaster.Com. Accident Database. Accident Synopsis 03171960. Accessed at: http://www.airdisaster.com/cgi-bin/view_details.cgi?date=03171960®=N121US&airline=Northwest+Orient
Aviation Safety Network. Accident Description. Northwest Flight 710, March 17, 1960. Accessed 12/21, 2008 at: http://aviation-safety.net/database/record.php?id=19600317-0
Civil Aeronautics Board. Aircraft Accident Report. Northwest Airlines Lockheed Electra, N 121US, Near Cannelton, Indiana, March 17, 1960. Wash., DC: CAB, April 28, 1961, 25 pp. At: http://dotlibrary1.specialcollection.net/scripts/ws.dll?file&fn=8&name=*P%3A%5CDOT%5Cairplane%20accidents%5Cwebsearch%5C031760.pdf
Kimura, Chris Y. World Commercial Aircraft Accidents 3rd Edition, 1946-1993, Volume 1: Jet and Turboprop Aircrafts. Livermore, CA: Lawrence Livermore National Laboratory, Risk Assessment and Nuclear Engineering Group. 4-11-1994.
Logansport Press, IN. “Blast Rivals Rail Wreck as Worst State Disaster.” 11-2-1963, 5. Accessed at: http://newspaperarchive.com/FullPagePdfViewer.aspx?img=84400396
Time Magazine. “Why This Failure…”, March 28, 1960. Accessed at: http://www.time.com/time/magazine/article/0,9171,826119,00.html