The DC-10 Aircraft
Question:
FWIW, the O’Hare crash was attributed to American changing the suspect engine with a forklift, thereby putting undo stress on the thrust link mounting pins that attached the engine to the wing.
That’s right, but the big problem was not that the engine fell off–airliners can continue to fly even if an engine drops off. The problem was that the hydraulic lines that control the flaps that make it possible to steer the aircraft were ripped out by the engine when it broke loose. The aircraft tilted to one side and the pilots were unable to control it. After this crash, the DC-10 (and others) were redesigned so that the hydraulic lines are placed toward the back of the wing away from the engine mountings, so that even if an engine falls off it can return to an airport. Not only that, but there is increased "redundancy" steering systems nowadays, so that if one system fails, another system can be used for the same function.
Response:
The problem was that the hydraulic lines that control the flaps that make it possible to steer the aircraft were ripped out by the engine when it broke loose. The aircraft tilted to one side and the pilots were unable to control it.
Close, but not quite. It had nothing to do with the flaps. When the hydraulic lines were severed, some of the leading edge slats on the left wing side retracted. This reduced the lift on that wing, and increased the speed where it would stall. The crew didn’t know the slats had retracted, since with the loss of the engine, the aircraft’s electrical power was also lost, and neither the slat asymmetric warning nor the stick shaker stall warning sounded. All the crew knew was that they had lost engine power, so they initiated an engine out procedure. American Airline’s rules for engine out at the time required that the pilot set up for maximum rate of climb with two engines. This caused the aircraft to slow, since speed was traded for altitude gain. When the airspeed dropped below a certain point, which was higher than the normal stall speed, the left wing stalled, and lost lift because of the lack of leading edge slats. This caused the aircraft to roll to the left, and no amount of aileron could counteract the roll. Had the crew maintained the airspeed they already had, rather than trading it off to gain altitude, the aircraft could have been saved. After this crash, the DC-10 (and others) were redesigned so that the hydraulic lines are placed toward the back of the wing away from the engine mountings, so that even if an engine falls off it can return to an airport.
More importantly, the hydraulic controls on the leading edge slats were redesigned so they wouldn’t allow the slats to retract if they lost pressure. Further, the electrical system was set up so the required alarms weren’t lost with the loss of the left engine. Not only that, but there is increased "redundancy" steering systems nowadays, so that if one system fails, another system can be used for the same function.
Exactly.
Response:
While public confidence was indeed shaken at the time of the accidents, mostly because of the extensive media coverage, the aircraft actually ended up with a safety record that was not that different from other commercial aircraft.
No kidding. People rarely fear the 747, yet one crashed in 1990-1991 in China, and then another one crashed in 1992 into an Amsterdam apartment block. In both instances TWO engines fell off. I dare say two engines falling off is much worse than one engine falling off, yet a huge stink was not made over the 747. The second one was an El Al cargo version, so less people were killed (mostly on the ground), so people did not pay as much attention, I suppose. Pete
Response:
Go to the database at www.airdisaster.com. The date of the Turkish crash was March 03, 1974. The American crash took place May 25, 1979. – Hide quoted text — Show quoted text – Does anybody have a quick update or link on the 1974 crashes of the DC-10’s at Chicago-O’Hare, when the engine sheared off – and the Turkish DC-10 at Orly in Paris the same year? Believe today is the anniversary date of the Turkish DC-10 crash. I flew that same DC-10 that crashed – if it was American Airlines out of O’Hare, just one month before it was lost on takeoff, and also believe that the 1974 crashes grounded the aircraft, and ended its sales. The craft is still in use as a freight hauler for FedEx, and I think as a West Coast hop over to Honolulu, but don’t think MD ever sold another one after the O’Hare crash, public confidence in the aircraft’s safety was shaken. Besides, I always liked its twin, the L-10ll better. I flew on the aircraft probably 15 times after those crashes, and I remember it always was a smooth and comfortable and stable aircraft, but I always was psychologically nervous when aboard it – in fact, planning travel, I usually would go out of my way to book a route where a 727 of DC-8 flew instead of having to fly the DC-10, thing made me nervous after those crashes. What is the history of the crashes and the final chapter of the DC-10 aircraft? Thanx……Stan
Response:
Biman Bangladesh Airlines proudly flies them to various destinations from its base in Dhaka. The airline has a good safety record (never mind the service though!). Pictures: http://www.airliners.net/search/photo.search?cnsearch=47817/300&disti…
Response:
Does anybody have a quick update or link on the 1974 crashes of the DC-10’s at Chicago-O’Hare, when the engine sheared off – and the Turkish DC-10 at Orly in Paris the same year?
The Chicago crash was in 1979. Believe today is the anniversary date of the Turkish DC-10 crash. I flew that same DC-10 that crashed – if it was American Airlines out of O’Hare, just one month before it was lost on takeoff, and also believe that the 1974 crashes grounded the aircraft, and ended its sales.
It is possible, but unlikely, that you flew the exact same aircraft. American Airlines owned lots of them by 1979, so it could have been any in their fleet. The crashes did not end the aircraft’s sales, as production continued until 1989. The craft is still in use as a freight hauler for FedEx, and I think as a West Coast hop over to Honolulu, but don’t think MD ever sold another one after the O’Hare crash, public confidence in the aircraft’s safety was shaken. Besides, I always liked its twin, the L-10ll better.
There are still many DC-10s in service as passenger carriers. Northwest, as an example, has about 20 of them that they still use on some international routes. While public confidence was indeed shaken at the time of the accidents, mostly because of the extensive media coverage, the aircraft actually ended up with a safety record that was not that different from other commercial aircraft. I flew on the aircraft probably 15 times after those crashes, and I remember it always was a smooth and comfortable and stable aircraft, but I always was psychologically nervous when aboard it – in fact, planning travel, I usually would go out of my way to book a route where a 727 of DC-8 flew instead of having to fly the DC-10, thing made me nervous after those crashes.
Which is the typical reaction to all the media focus. The DC-10 actually ended up with about an average accident rate for aircraft of that era. It has been reasonably good, if you just look at the events over the last 25 years. What is the history of the crashes and the final chapter of the DC-10 aircraft?
The final chapter has not been written, as there are many DC-10s still flying.
Response:
Does anybody have a quick update or link on the 1974 crashes of the DC-10’s at Chicago-O’Hare, when the engine sheared off – and the Turkish DC-10 at Orly in Paris the same year?
The Chicago crash was in 1979, IIRC.
Response:
Thanx for the input everybody, always can get the right answer over here, I haven’t seen a DC-10 in awhile, except the freight hauler one FedEx uses out of Ft.Lauderdale-Hollywood. I was traveling cross-country on American a lot in the mid and late 1970’s to LA and San Fran, I do believe, however, that the DC-10 that crashed at Chicago-O’Hare, I flew on that craft to San Francisco just a month or so earlier. I also seem to remember they grounded the plane for a safety check for a short time which probably also contributed to a loss in public confidence in the thing. I had no particular bad experience ever on a DC-10 (wasn’t a nervous flyer), but after the crashes, everytime I got aboard one, if I couldn’t get the 727 or Delta’s DC-8, was just nervous, and remember coming into O’Hare from Las Vegas in the middle of a snowstorm, coming down blind after circling O’Hare for about 1/2 hour. Thing was solid and smooth, and you couldn’t see a darn thing in the fog outside until it broke through…….Stan
Response:
– Hide quoted text — Show quoted text – Does anybody have a quick update or link on the 1974 crashes of the DC-10’s at Chicago-O’Hare, when the engine sheared off – and the Turkish DC-10 at Orly in Paris the same year? Believe today is the anniversary date of the Turkish DC-10 crash. I flew that same DC-10 that crashed – if it was American Airlines out of O’Hare, just one month before it was lost on takeoff, and also believe that the 1974 crashes grounded the aircraft, and ended its sales. The craft is still in use as a freight hauler for FedEx, and I think as a West Coast hop over to Honolulu, but don’t think MD ever sold another one after the O’Hare crash, public confidence in the aircraft’s safety was shaken. Besides, I always liked its twin, the L-10ll better. I flew on the aircraft probably 15 times after those crashes, and I remember it always was a smooth and comfortable and stable aircraft, but I always was psychologically nervous when aboard it – in fact, planning travel, I usually would go out of my way to book a route where a 727 of DC-8 flew instead of having to fly the DC-10, thing made me nervous after those crashes. What is the history of the crashes and the final chapter of the DC-10 aircraft? Thanx……Stan
FWIW, the O’Hare crash was attributed to American changing the suspect engine with a forklift, thereby putting undo stress on the thrust link mounting pins that attached the engine to the wing. The Turkish crash was a design issue if I recall correctly with the cargo doors. And there were many more -10’s sold after both.
Response:
The craft is still in use as a freight hauler for FedEx, and I think as a West Coast hop over to Honolulu
Northwest put me on one from San Francisco to Tokyo less than a year ago. miguel — Hit The Road! Photos from 35 countries on 5 continents: http://travel.u.nu Latest photos: Malaysia, Israel, Palestine, Austria, Thailand
Response:
Does anybody have a quick update or link on the 1974 crashes of the DC-10’s at Chicago-O’Hare, when the engine sheared off – and the Turkish DC-10 at Orly in Paris the same year? Believe today is the anniversary date of the Turkish DC-10 crash. I flew that same DC-10 that crashed – if it was American Airlines out of O’Hare, just one month before it was lost on takeoff, and also believe that the 1974 crashes grounded the aircraft, and ended its sales. The craft is still in use as a freight hauler for FedEx, and I think as a West Coast hop over to Honolulu, but don’t think MD ever sold another one after the O’Hare crash, public confidence in the aircraft’s safety was shaken. Besides, I always liked its twin, the L-10ll better. I flew on the aircraft probably 15 times after those crashes, and I remember it always was a smooth and comfortable and stable aircraft, but I always was psychologically nervous when aboard it – in fact, planning travel, I usually would go out of my way to book a route where a 727 of DC-8 flew instead of having to fly the DC-10, thing made me nervous after those crashes. What is the history of the crashes and the final chapter of the DC-10 aircraft? Thanx……Stan
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