Delta Air Lines Flight 191 was a regularly scheduled Delta Air Lines domestic service from Fort Lauderdale, Florida, to Los Angeles with an intermediate stop at Dallas/Fort Worth International Airport (DFW). On August 2, 1985, the Lockheed L-1011 TriStar operating Flight 191 encountered a microburst while on approach to land at DFW. The aircraft struck the ground over a mile short of the runway, struck a car near the airport, and then collided with two water tanks and disintegrated. The crash killed 137 people and injured 28 others. The National Transportation Safety Board (NTSB) determined that the crash resulted from the flight crew's decision to fly through a thunderstorm, the lack of procedures or training to avoid or escape microbursts, and the lack of hazard information on wind shear.
Video Delta Air Lines Flight 191
Involved
Aircraft
The aircraft was a Lockheed L-1011-385-1 TriStar (registration number N726DA). It was delivered to Delta on February 28, 1979, and the airline had operated it continuously since that date. Three Rolls-Royce RB211-22B engines powered the aircraft.
Crew members
Three flight crew and eight cabin crew members manned Flight 191.
The captain, Edward N. Connors, age 57, had been a Delta Air Lines employee since 1954. He qualified to captain the TriStar in 1979 and had passed his proficiency checks. The NTSB report mentioned that other flight crew that had flown with Connors prior to the accident described him as a meticulous pilot who strictly adhered to company policies. The report also stated that Connors "deviated around thunderstorms even if other flights took more direct routes" and "willingly accepted suggestions from his flightcrew." Since his qualification in 1979, Connors had passed all eight en route inspections he had undergone, and the NTSB report notes that he had received "favorable comments" regarding "cockpit discipline and standardization." Connors had logged over 29,300 hours of flight time, 3,000 of which had been in the TriStar.
Flight 191's first officer was Rudolph P. Price Jr, age 42. Delta captains who flew with Price described him as an "above average first officer" and possessing "excellent knowledge" of the TriStar. Price had logged 6,500 flight hours, including 1,200 in the TriStar. The flight engineer, Nick N. Nassick, age 43, had logged 6,500 hours of flight time, including 4,500 in the TriStar. Fellow Delta employees described him as "observant, alert, and professional."
Eight flight attendants were aboard the flight: Frances Alford, Jenny Amatulli, Freida Artz, Vicki Chavis, Diane Johnson, Alyson Lee, Joan Modzelewski, and Wendy Robinson. Amatulli, Chavis, and Robinson were the only flight crew members who survived.
Passengers
Of the deceased, 73 originated from the Miami metropolitan area. Of them, 45 were from Broward County, 19 were from Palm Beach County, and 9 were from Dade County. One of the passengers was Don Estridge, known to the world as the father of the IBM PC; he died aboard the flight along with his wife, Mary Ann, two IBM summer interns, and six additional family members of IBM employees. Another passenger was Jean Hancock, aged 41, a computer analyst and lyricist and the sister of musician Herbie Hancock. The NTSB lists 126 passenger fatalities, but notes that an additional 2 of the passengers listed as survivors died more than 30 days after the crash.
Maps Delta Air Lines Flight 191
Flight
History of the flight
Flight 191 was a regularly scheduled passenger flight from Fort Lauderdale-Hollywood International Airport in Fort Lauderdale, Florida to Los Angeles International Airport in Los Angeles, California, with a scheduled stop at Dallas/Fort Worth International Airport. The flight departed Fort Lauderdale on an instrument flight rules (IFR) flight plan at 14:10 Central Daylight Time (UTC-05:00). The flight's dispatch weather forecast for DFW stated a "possibility of widely scattered rain showers and thunderstorms." Another dispatch weather alert warned of "an area of isolated thunderstorms ... over Oklahoma and northern and northeastern Texas." The flight crew reviewed these notices before takeoff.
As the aircraft flew past New Orleans, Louisiana, a weather formation near the Gulf Coast strengthened. The flight crew decided to deviate from the intended route to make the more northerly Blue Ridge arrival to DFW. The flight held for 10-15 minutes over the Texarkana, Arkansas VORTAC. At 17:35, the crew received an Automatic Terminal Information Service (ATIS) broadcast for weather on approach to DFW, and the Fort Worth Air Route Traffic Control Center (ARTCC) air traffic controller cleared the flight to the Blue Ridge, Texas VORTAC and instructed the flight to descend to 25,000 feet (7,600 m).
At 17:43:45, the Fort Worth ARTCC controller cleared the flight down to 10,000 feet (3,000 m). The controller suggested they fly a heading of 250° toward the Blue Ridge approach, but Captain Connors replied that the route would take them through a storm cell, stating, "I'd rather not go through it, I'd rather go around it one way or the other." After a brief exchange, the controller gave the flight a new heading. At 17:46:50, the controller cleared the flight direct to Blue Ridge and instructed the flight crew to descend to 9,000 feet (2,700 m). The captain expressed his relief that the controller didn't send them on the original trajectory. At 17:51:19, the second officer commented, "Looks like it's raining over Fort Worth." At 17:51:42, the Fort Worth ARTCC controller transferred the flight to DFW Airport Approach Control, which cleared the flight to descend to 7,000 feet (2,100 m). Two minutes later, the controller asked the Delta flight to deviate by ten degrees and to slow their airspeed to 180 knots (210 mph). The flight acknowledged the request. As the flight descended, the crew prepared the aircraft for landing. At 17:56:19, the feeder controller cleared the flight down to 5,000 feet (1,500 m). Nine seconds later, the controller announced that there was rain north of the airport, and that the airport would be using instrument landing system (ILS) approaches.
At 17:59:47, Price said, "We're gonna get our airplane washed." At around the same time, the captain switched to the arrival radio frequency and informed the approach controller that they were flying at 5,000 feet (1,500 m). The controller replied that the flight should expect to approach Runway 17L (now Runway 17C). At 18:00:36, the approach controller asked an American Airlines flight that was two aircraft ahead of Flight 191, and on the same approach, if they could see the airport. The flight responded, "As soon as we break out of this rain shower we will." At 18:00:51, Flight 191 was instructed to slow to 170 knots (200 mph) and to turn to heading 270°. Flight 191 was instructed to descend to 3,000 feet (910 m) at 18:01:34. One minute later, the approach controller turned the flight toward Runway 17L and cleared them for an ILS approach at or above 2,300 feet (700 m). Half a minute afterward, the controller asked the flight to reduce their speed to 160 knots (180 mph), which the flight crew acknowledged. At 18:03:30 the controller advised, "And we're getting some variable winds out there due to a shower ... out there north end of DFW." Several seconds later, an unidentified flight crew member commented, "Stuff is moving in."
Just three miles ahead of Flight 191 was a Learjet 25 on the same approach to Runway 17L. While on final approach, the Learjet flew through the storm north of the airport and encountered what was later described as "light to moderate turbulence". The Learjet encountered heavy rain and lost all forward visibility, but was able to continue its ILS approach and land safely. When later asked why he did not report weather conditions to the tower, the Learjet's captain testified that he had nothing to report because "the only thing that we encountered was the heavy rain." The tower controller handling landings on Runway 17L saw lightning from the storm cell after the Learjet landed, but before he saw Flight 191 emerge from the storm.
Crash
At 18:03:46, the approach controller once again asked Flight 191 to reduce its speed, this time to 150 knots (170 mph), and then handed the flight over to the tower controller. Twelve seconds later, the captain radioed the tower and said, "Tower[:] Delta one ninety one heavy, out here in the rain, feels good." The tower controller advised Flight 191 that the wind was blowing at 5 knots (5.8 mph) with gusts up to 15 knots (17 mph), which the captain acknowledged. The flight crew lowered the landing gear and extended their flaps for landing. At 18:04:18, Price commented, "Lightning coming out of that one. ... Right ahead of us." The captain called out that they were at 1,000 feet (300 m) at 18:05:05. Fourteen seconds later, he cautioned Price to watch his airspeed. At the same time, the cockpit voice recorder (CVR) captured the beginning of a sound identified as rain hitting the cockpit. The captain warned Price, "You're gonna lose it all of a sudden, there it is." At 18:05:26, the captain told Price, "Push it up, push it way up." Several seconds later, the CVR recorded the sound of the engines spooling up. Connors then said, "That's it." At 18:05:36, Connors exclaimed, "Hang on to the son of a bitch!" From this point, the aircraft began a descent from which it never recovered. The angle of attack (AOA) was over 30° and began to vary wildly over the next few seconds. The pitch angle began to sink and the aircraft started descending below the glideslope.
At 18:05:44, with the aircraft descending at more than 50 feet (15 m) per second the ground proximity warning system (GPWS) began a series of "whoop whoop pull up" audible warnings. The captain responded by declaring "TOGA", aviation shorthand for the order to apply maximum thrust and abort a landing by going around. The first officer responded by pulling up and raising the nose of the aircraft, which slowed but did not stop the plane's descent. At 18:05:52, still descending at a rate of approximately 10 feet (3.0 m) per second, the aircraft's landing gear made contact with a plowed field 6,336 feet (1,931 m) north of the runway and 360 feet (110 m) east of the runway centerline. Remaining structurally intact, Flight 191 remained on the ground while rolling at high speed across the farmland. The main landing gear left shallow depressions in the field that extended for 240 feet (73 m) before disappearing and reappearing a couple of times as the aircraft approached Texas State Highway 114.
The aircraft struck a highway street light, and its nose gear touched down on the westbound lane of Highway 114. The aircraft's left engine hit a Toyota Celica driven by 28-year-old William Mayberry, killing him instantly. As the aircraft continued south, it hit two more street lights on the eastbound side of the highway and began fragmenting. The left horizontal stabilizer, some engine pieces, portions of the wing control surfaces, and parts of the nose gear came off of the aircraft as it continued along the ground. Some witnesses later testified that fire was emerging from the left wing root. Surviving passengers reported that fire began entering the cabin through the left wall while the plane was still moving. The aircraft's roll across open land ended when it crashed into a pair of water tanks on the edge of the airport property; the aircraft grazed one water tank about 1,700 feet (520 m) south of Highway 114, and then struck the second water tank. As the left wing and nose struck the water tank, the fuselage rotated counterclockwise and was engulfed in a fireball. The fuselage from the nose rearward to row 34 was destroyed. The tail section emerged from the fireball, skidding backwards, and came to rest on its left side before wind gusts rotated it upright.
Post-crash response
All airport fire and emergency units were alerted within one minute of the crash. 45 seconds after first being alerted, three fire trucks from the airport's fire station No. 3 arrived at the crash and began fighting the fire. Additional units from fire stations No. 1 and No. 3 arrived within 5 minutes, and despite high wind gusts and heavy rain, the fire was mostly under control within 10 minutes after the alert was sounded.
The first paramedics arrived within 5 minutes of the crash, and immediately established triage stations. In later testimony to NTSB officials, on-site EMTs estimated that without the on-scene triage procedures, at least half of the surviving passengers would have died. Most of the survivors of Flight 191 were located in the aircraft's rear smoking section, which broke free from the main fuselage before the aircraft hit the water tanks. Authorities transported most of the survivors to Parkland Memorial Hospital.
The cockpit and passenger section forward of seat row 34 had been completely fragmented by impact with the water tanks and post-crash fires; all but eight of the occupants in this section were killed. The remainder of the surviving passengers and crew were in the rear cabin and tail section, which separated relatively intact and landed on its side in an open field. Overall, the disintegration of the Tristar was so extensive that the NTSB investigation was quite difficult. Survivors reported that fire broke out in the cabin prior to hitting the tanks, and began spreading through the aircraft's interior, which is consistent with the right wing's collision with the light pole and fuel tank ignition. Some of the people in the tail section were unable to free themselves due to injuries and rescue crews had to extricate them. Most survivors were also soaked with jet fuel, further adding to the difficulty of exiting the wreckage.
Two of the passengers who initially survived the crash died more than thirty days later. On the ground, an airline employee who assisted in rescuing survivors was hospitalized overnight for chest and arm pain. The crash ultimately killed 137 people, including 128 of the 152 passengers and 8 of the 11 crew, and the driver of the car.
Delta Air Lines Flight 191 has the second-highest death toll of any aviation accident involving a Lockheed L-1011 anywhere in the world, after Saudia Flight 163.
Investigation
Numerous public safety agencies responded to the crash, including the Dallas/Fort Worth Airport Department of Public Safety, the Texas Department of Public Safety, the Irving Fire Department, the Irving Police Department and all available third watch personnel from the Dallas Police Department's Northwest Patrol Division and the Northeastern Sector of the Fort Worth Police Department's Patrol Division.
After a long investigation, the National Transportation Safety Board deemed the cause of the crash to be attributable to pilot error (for their decision to fly through a thunderstorm), combined with extreme weather phenomena associated with microburst-induced wind shear. The NTSB also determined that a lack of specific training, policies, and procedures for avoiding and escaping low-altitude wind shear was a contributing factor.
The NTSB attributed the accident to lack of the ability to detect microbursts aboard aircraft - the radar equipment aboard aircraft at the time was unable to detect wind changes, only thunderstorms. After the investigation, NASA researchers at Langley Research Center modified a Boeing 737-200 as a testbed for an on-board Doppler weather radar. The resultant airborne wind shear detection and alert system was installed on many commercial airliners in the United States after the FAA mandated that all commercial aircraft must have on-board windshear detection systems.
The NTSB was also critical of the airport for failing to notify emergency services in surrounding municipalities in a timely manner. While the airport's on-site emergency services were notified almost immediately, the DFW Department of Public Safety (DPS) Communications Center did not begin notifying off-site emergency services until nearly 10 minutes after the crash, and did not finish its notifications until 45 minutes after the crash. During notifications, DPS also failed to request ambulances from the adjacent communities of Irving, Grapevine, and Hurst; however, Hurst responded with ambulances after personnel at its ambulance company overheard the airport crash report on a radio-frequency scanner. The NTSB concluded that the overall emergency response was effective due to the rapid response of on-airport personnel, but found "several problem areas" which under different circumstances "could affect adversely the medical treatment and survival of accident victims at the airport".
Legacy
Following the crash and the ensuing NTSB report, DFW's DPS made improvements to its post-crash notification system, including the introduction of an automated voice notification system to reduce notification times. In 1988, following the crash of Delta Air Lines Flight 1141 while taking off from DFW, DPS completed its notification of nearby emergency services in 21 minutes; the NTSB described this as a "significant improvement" over response times after the Delta Flight 191 crash. Based on the improved response times, the NTSB issued a Safety Recommendation on January 9, 1990 calling for airport executives nationwide to consider the benefits of using automated voice notification systems for their emergency aid notifications.
The Delta Flight 191 crash resulted in the longest aviation trial in American history, lasting fourteen months from 1988 to 1989 and presided over by federal judge David Owen Belew Jr. The trial featured the first use of computer graphic animation as substantive evidence in federal court; while the use of such animation is now routine, its use in the Flight 191 litigation was novel enough that it became the featured cover story of a 1989 issue of ABA Journal, the magazine of the American Bar Association. Preparing the animated video for trial cost the Department of Justice around $100,000 to $150,000, and required nearly two years of work. The court found that both government personnel and the Delta flight crew were negligent, but that Delta was ultimately responsible because its pilots' negligence was the proximate cause of the accident, and the ruling was upheld on appeal to the Fifth Circuit Court of Appeals.
Dramatization and media
The crash was the subject of the television movie Fire and Rain.
The Discovery Channel Canada / National Geographic TV series Mayday dramatized the crash of Flight 191 in a Season 5 episode titled Invisible Killer. The crash had previously been discussed in the Mayday Season 1 episode Racing the Storm, which covered the weather-related crash landing of American Airlines Flight 1420.
The crash was featured on an episode of When Weather Changed History and Why Planes Crash on The Weather Channel, and the episode "Deadly Weather" of Survival in the Sky on The Learning Channel.
The crash was mentioned in the feature film Rain Man.
Working as a reporter for the Fort Lauderdale News and Sun-Sentinel in 1986, future renowned mystery author Michael Connelly and two other reporters conducted extensive interviews of survivors of Delta Flight 191 and wrote an article detailing their experiences during and after the crash. The article explored the topic of survivor guilt and earned Connelly and his co-writers a finalist position for the Pulitzer Prize.
Memorial
In 2010, 25 years after the accident, a memorial was installed at Dallas-Fort Worth International Airport's Founders Plaza in Grapevine.
See also
- Aviation safety
- Pan Am Flight 759
- USAir Flight 1016
- Martinair Flight 495
- List of accidents and incidents involving commercial aircraft
Notes
References
This article incorporates public domain material from websites or documents of the National Transportation Safety Board.
External links
- Pre-accident photos from Airliners.net
- DFW Delta Flight 191 - Essay from Mica Calfee, a firefighter-paramedic who responded to the crash
- NTSB executive summary report
- Delta 191 In Their Words
- Animation of the crash, indicating wind vectors and synchronized to voice recorder data (description here)
- Vanderbilt Television News Archive
Source of the article : Wikipedia
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