TWA Flight 800: Difference between revisions
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'''[[Trans World Airlines]] Flight 800''' ('''TWA 800'''), a [[Boeing 747|Boeing 747-100]], exploded and crashed into the Atlantic Ocean near [[East Moriches, New York]], on July 17, 1996, at about 8:31 PM [[Eastern Daylight Time|EDT]], 12 minutes after takeoff from [[John F. Kennedy International Airport]] |
'''[[Trans World Airlines]] Flight 800''' ('''TWA 800'''), a [[Boeing 747|Boeing 747-100]], exploded and crashed into the Atlantic Ocean near [[East Moriches, New York]], on July 17, 1996, at about 8:31 PM [[Eastern Daylight Time|EDT]], 12 minutes after takeoff from [[John F. Kennedy International Airport]] on a scheduled international passenger flight to Rome, with a stopover in Paris.<ref name="Final Report p.1">{{cite journal | author=National Transportation Safety Board | year=2000 | title=Aircraft Accident Report: In-flight Breakup Over the Atlantic Ocean Trans World Airlines Flight 800 | journal=Ntsb/aar-00/03 | pages=p.1 | url=http://www.ntsb.gov/doclib/reports/2000/AAR0003.pdf | format=PDF | accessdate=April 5, 2011 }}</ref> All 230 people on board were killed, the third-deadliest aviation accident to occur in U.S. territory. |
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While accident investigators from the [[National Transportation Safety Board]] (NTSB) traveled to the scene, arriving the following morning,<ref name="Final Report p.313">{{cite journal | author=National Transportation Safety Board | year=2000 | title=Aircraft Accident Report: In-flight Breakup Over the Atlantic Ocean Trans World Airlines Flight 800 | journal=NTSB/AAR-00/03 Appendixes | pages=p.313 | url=http://www.ntsb.gov/doclib/reports/2000/AAR0003.pdf | format=PDF |accessdate=April 5, 2011}}</ref> there was much initial speculation that a terrorist attack was the cause of the crash.<ref name="CNN 19Jul96">{{cite news | last=CNN | title=What happened to Flight 800? | url=http://www.cnn.com/US/9607/19/twa.investigation/index.html | date=July 19, 1996 | accessdate=April 5, 2011 }}</ref><ref name="NYT 24Jul96">{{cite news | first=Brian | last=Knowlton | title=Investigators Focus Closely on Terrorism As Cause of Explosion: Chemicals Found on Jet Victims, U.S. Reports | url=http://www.nytimes.com/1996/07/24/news/24iht-plane.t_9.html | newspaper=The New York Times | date=July 24, 1996 | accessdate=April 5, 2011 }}</ref><ref name="Time Mag 29Jul96">{{cite journal | first=et al. | last=Fedarko | title=Terror on Flight 800: Who wishes us ill? | url=http://www.time.com/time/magazine/article/0,9171,984902,00.html |journal=Time Magazine | date=July 29, 1996 | accessdate=April 5, 2011 }}</ref> Consequently, the [[Federal Bureau of Investigation]] (FBI) initiated a parallel criminal investigation.<ref name="CNN 19Jul96(2)">{{cite news | last=CNN | title=Aviation and criminal experts probe TWA crash | url=http://www.cnn.com/US/9607/19/twa.main/index.html | date=July 19, 1996 | accessdate=April 5, 2011 }}</ref> Sixteen months later the FBI announced that no evidence had been found of a criminal act and closed its active investigation.<ref name="CNN 18Nov97">{{cite news | last=CNN | title=FBI: No criminal evidence behind TWA 800 crash | url=http://www.cnn.com/US/9711/18/twa.fbi.presser/index.html | date=November 18, 1997 | accessdate=April 5, 2011 }}</ref> |
While accident investigators from the [[National Transportation Safety Board]] (NTSB) traveled to the scene, arriving the following morning,<ref name="Final Report p.313">{{cite journal | author=National Transportation Safety Board | year=2000 | title=Aircraft Accident Report: In-flight Breakup Over the Atlantic Ocean Trans World Airlines Flight 800 | journal=NTSB/AAR-00/03 Appendixes | pages=p.313 | url=http://www.ntsb.gov/doclib/reports/2000/AAR0003.pdf | format=PDF |accessdate=April 5, 2011}}</ref> there was much initial speculation that a terrorist attack was the cause of the crash.<ref name="CNN 19Jul96">{{cite news | last=CNN | title=What happened to Flight 800? | url=http://www.cnn.com/US/9607/19/twa.investigation/index.html | date=July 19, 1996 | accessdate=April 5, 2011 }}</ref><ref name="NYT 24Jul96">{{cite news | first=Brian | last=Knowlton | title=Investigators Focus Closely on Terrorism As Cause of Explosion: Chemicals Found on Jet Victims, U.S. Reports | url=http://www.nytimes.com/1996/07/24/news/24iht-plane.t_9.html | newspaper=The New York Times | date=July 24, 1996 | accessdate=April 5, 2011 }}</ref><ref name="Time Mag 29Jul96">{{cite journal | first=et al. | last=Fedarko | title=Terror on Flight 800: Who wishes us ill? | url=http://www.time.com/time/magazine/article/0,9171,984902,00.html |journal=Time Magazine | date=July 29, 1996 | accessdate=April 5, 2011 }}</ref> Consequently, the [[Federal Bureau of Investigation]] (FBI) initiated a parallel criminal investigation.<ref name="CNN 19Jul96(2)">{{cite news | last=CNN | title=Aviation and criminal experts probe TWA crash | url=http://www.cnn.com/US/9607/19/twa.main/index.html | date=July 19, 1996 | accessdate=April 5, 2011 }}</ref> Sixteen months later the FBI announced that no evidence had been found of a criminal act and closed its active investigation.<ref name="CNN 18Nov97">{{cite news | last=CNN | title=FBI: No criminal evidence behind TWA 800 crash | url=http://www.cnn.com/US/9711/18/twa.fbi.presser/index.html | date=November 18, 1997 | accessdate=April 5, 2011 }}</ref> |
Revision as of 09:19, 21 June 2013
![]() Flight 800 wreckage recovered and reconstructed. | |
Accident | |
---|---|
Date | July 17, 1996 |
Summary | Fuel tank explosion, caused by electrical spark. |
Site | Moriches Inlet near East Moriches, New York |
Aircraft | |
Aircraft type | Boeing 747-100 |
Operator | Trans World Airlines |
Registration | N93119 |
Flight origin | John F. Kennedy Int'l Airport New York City, United States |
Stopover | Paris-Charles de Gaulle Airport Paris, France |
Destination | Leonardo da Vinci Int'l Airport Rome, Italy |
Passengers | 212 |
Crew | 18 |
Fatalities | 230 (all) |
Trans World Airlines Flight 800 (TWA 800), a Boeing 747-100, exploded and crashed into the Atlantic Ocean near East Moriches, New York, on July 17, 1996, at about 8:31 PM EDT, 12 minutes after takeoff from John F. Kennedy International Airport on a scheduled international passenger flight to Rome, with a stopover in Paris.[1] All 230 people on board were killed, the third-deadliest aviation accident to occur in U.S. territory.
While accident investigators from the National Transportation Safety Board (NTSB) traveled to the scene, arriving the following morning,[2] there was much initial speculation that a terrorist attack was the cause of the crash.[3][4][5] Consequently, the Federal Bureau of Investigation (FBI) initiated a parallel criminal investigation.[6] Sixteen months later the FBI announced that no evidence had been found of a criminal act and closed its active investigation.[7]
The four-year NTSB investigation concluded with the approval of the Aircraft Accident Report on August 23, 2000, ending the most extensive, complex, and costly air disaster investigation in United States history.[8][9] The report's conclusion was that the probable cause of the accident was an explosion of flammable fuel/air vapors in a fuel tank, and, although it could not be determined with certainty, the most likely cause of the explosion was a short circuit.[10] As a result of the investigation, new requirements were developed for aircraft to prevent future fuel tank explosions.[11]
Many TWA Flight 800 alternative theories exist, the most prevalent being that a missile strike from a terrorist or U.S. Navy vessel caused the crash, and is the subject of a government coverup.[12][13]
Accident flight
![](http://upload.wikimedia.org/wikipedia/commons/thumb/3/3e/TWA_Boeing_747-100_N93119_Marmet.jpg/220px-TWA_Boeing_747-100_N93119_Marmet.jpg)
- All times in this article are Eastern Daylight Time (EDT).
The accident airplane, registration N93119, was manufactured by Boeing in July 1971, and purchased new by TWA. The aircraft had completed 16,869 flights with 93,303 hours of operation.[14] On the day of the accident the airplane departed Athens, Greece, as TWA Flight 881, and arrived at the gate at John F. Kennedy International Airport (JFK) about 16:38. The aircraft was refueled, and there was a crew change; the new flight crew consisted of Captain Ralph G. Kevorkian, Captain/Check Airman Steven E. Snyder and Flight Engineer/Check Airman Richard G. Campbell (all with more than 30 years employment at TWA), and Flight Engineer Trainee Oliver Krick, who was starting the sixth leg of his initial operating experience training.[15][16]
Because of technical problems with the thrust reverser sensors during the landing of TWA 881 at JFK, prior to flight 800 the ground-maintenance crew locked-out the thrust reverser for engine #3 (treated as a minimum equipment list item). In addition, severed cables for the engine #3 thrust reverser were replaced.[17] During refueling of the aircraft, the volumetric shutoff (VSO) control was believed to have been triggered before the tanks were full. To continue the pressure fueling, a TWA mechanic overrode the automatic VSO by pulling the volumetric fuse and an overflow circuit breaker. Maintenance records indicate that the airplane had numerous VSO-related maintenance writeups in the weeks before the accident.[18]
TWA 800 was scheduled to depart JFK for Paris around 19:00, but the flight was delayed until 20:02 by a disabled piece of ground equipment and a passenger/baggage mismatch.[1] After the owner of the baggage in question was confirmed to be on board, the flight crew prepared for departure and the aircraft pushed back from gate 27 at the TWA Flight Center.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Twa_800_flight_path.png/220px-Twa_800_flight_path.png)
TWA 800 then received a series of heading changes and generally increasing altitude assignments as it climbed to its intended cruising altitude.[20] Weather in the area was light winds with scattered clouds,[21] and there were dusk lighting conditions.[22] The last radio transmission from the airplane occurred at 20:30 when the flight crew received and then acknowledged instructions from New York Center to climb to 15,000 feet (4,600 m).[23] The last recorded radar transponder return from the airplane was recorded by the Federal Aviation Administration (FAA) radar site at Trevose, Pennsylvania at 20:31:12.[24]
Thirty-eight seconds later, the captain of an Eastwind Airlines Boeing 737 reported to Boston ARTCC that he "just saw an explosion out here," adding, "we just saw an explosion up ahead of us here...about 16,000 feet [4,900m] or something like that, it just went down into the water." Subsequently, many air traffic control facilities in the New York/Long Island area received reports of an explosion from other pilots operating in the area. Many witnesses in the vicinity of the crash stated that they saw or heard explosions, accompanied by a large fireball or fireballs over the ocean, and observed debris, some of which was burning, falling into the water.[24]
Although individuals in various civilian, military and police vessels reached the crash site and searched for survivors within minutes of the initial water impact, no survivors were found,[25] making TWA 800 the second deadliest aircraft accident in the United States at that time.[26]
Initial investigation
The NTSB was notified about 20:50 the day of the accident; a full go-team was assembled in Washington, D.C. and arrived on scene early the next morning.[2] Meanwhile, initial witness descriptions led many to believe the cause of the crash was a bomb or missile attack.[27][28][29] The NTSB does not investigate criminal activity. In past investigations, once it was established that a crash was, in fact, a criminal act, the FBI had become the lead federal investigative body, with the NTSB providing any requested support.[30] In the case of TWA 800, the FBI initiated a parallel criminal investigation alongside the NTSB's accident investigation.[31]
Search and recovery operations
Search and recovery operations were conducted by federal, state, and local agencies, as well as government contractors.[32] Remote-operated vehicles (ROVs), side-scan sonar, and laser line-scanning equipment were used to search for and investigate underwater debris fields. Victims and wreckage were recovered by Scuba divers and ROVs; later scallop trawlers were used to recover wreckage embedded in the ocean floor.[33] In one of the largest diver-assisted salvage operations ever conducted, often working in very difficult and dangerous conditions, over 95% of the airplane wreckage was eventually recovered.[31][34] The search and recovery effort identified three main areas of wreckage underwater.[35] The yellow zone, red zone, and green zone contained wreckage from front, center, and rear sections of the airplane, respectively.[36] The green zone with the aft portion of the aircraft was located the furthest along the flight path.[37]
Pieces of wreckage were transported by boat to shore and then by truck to leased hangar space at the former Grumman Aircraft facility in Calverton, New York for storage, examination, and reconstruction.[33] This facility became the command center and headquarters for the investigation.[32] NTSB and FBI personnel were present to observe all transfers to preserve the evidentiary value of the wreckage.[40] The Cockpit Voice Recorder and Flight Data Recorder were recovered by U.S. Navy divers a week after the accident; they were immediately shipped to the NTSB laboratory in Washington, D.C., for readout.[41] The victims were transported to the Suffolk County Medical Examiner's Office in Hauppauge, New York.[42]
Tensions in the investigation
Relatives of TWA 800 passengers and crew, as well as the media, gathered at a Ramada Plaza Hotel near JFK.[43] Many waited until the remains of their family members had been recovered, identified and released.[44][45][46] Grief turned to anger at TWA's delay in confirming the passenger list,[43] conflicting information from agencies and officials,[47] and mistrust of the recovery operation's priorities.[48] Although NTSB vice chairman Robert Francis stated that all bodies were being retrieved as soon as they were spotted, and that wreckage was being recovered only if divers believed that victims were hidden underneath,[48] many families were suspicious that investigators were not being truthful, or withholding information.[48][49][50]
Much anger and political pressure was also directed at Suffolk County Medical Examiner Dr. Charles V. Wetli as recovered bodies backlogged at the morgue.[50][51][52] Under constant and considerable pressure to identify victims with minimal delay,[53] pathologists worked non-stop.[52] Since the primary objective was to identify all remains rather than performing a detailed forensic autopsy, the thoroughness of the examinations was highly variable.[53] Ultimately, remains of all 230 victims were recovered and identified, the last over 10 months later.[42]
With lines of authority unclear, differences in agendas and culture between the FBI and NTSB resulted in discord.[54] The FBI, from the start assuming that a criminal act had occurred,[55] saw the NTSB as indecisive. Expressing frustration at the NTSB's unwillingness to speculate on a cause, one FBI agent described the NTSB as "No opinions. No nothing".[56] Meanwhile the NTSB was required to refute or play down speculation about conclusions and evidence, frequently supplied to reporters by law enforcement officials and politicians.[51][56]
Witness interviews
Many witnesses to the accident had seen a "streak of light" that was usually described as ascending,[58] moving to a point where a large fireball appeared, with several witnesses reporting that the fireball split in two as it descended toward the water.[24] There was intense public interest in these witness reports and much speculation that the reported streak of light was a missile that had struck TWA 800, causing the airplane to explode.[59] These witness accounts were a major reason for the initiation and duration of the FBI's criminal investigation.[60]
Approximately 80 FBI agents conducted interviews with potential witnesses daily.[61] No verbatim records of the witness interviews were produced; instead, the agents who conducted the interviews wrote summaries that they then submitted.[60] Witnesses were not asked to review or correct the summaries.[60] Included in some of the witness summaries were drawings or diagrams of what the witness observed.[62][63]
Within days of the crash the NTSB announced its intent to form its own witness group and to interview witnesses to the crash.[64] However, after the FBI raised concerns about non-governmental parties in the NTSB's investigation having access to this information and possible prosecutorial difficulties resulting from multiple interviews of the same witness,[64] the NTSB deferred and initially neither interviewed nor re-interviewed witnesses to the crash.[65]
Further investigation and analysis
Examination of the Cockpit Voice Recorder (CVR) and Flight Data Recorder data showed a normal takeoff and climb,[66] with the aircraft in normal flight[67] before both abruptly stopped at 20:31:12.[24] A noise recorded on the last few tenths of a second of the CVR was similar to the last noises recorded from other airplanes that had experienced in-flight breakups.[21] This, together with the distribution of wreckage and witness reports, all indicated a sudden catastrophic in-flight breakup of TWA 800.[21]
Possible causes of the in-flight breakup
Investigators considered several possible causes for the structural breakup: structural failure and decompression, detonation of a high-energy explosive device, such as a missile warhead exploding upon impact with the airplane or bomb exploding inside the airplane, or a fuel/air explosion in the center wing fuel tank.[21][68]
Structural failure and decompression
Close examination of the wreckage revealed no evidence of structural faults such as fatigue, corrosion or mechanical damage that could have caused the in-flight breakup.[68] It was also suggested that the breakup could have been initiated by an in-flight separation of the forward cargo door; however, all evidence indicated that the door was closed and locked at impact.[68] The NTSB concluded that "the in-flight breakup of TWA flight 800 was not initiated by a preexisting condition resulting in a structural failure and decompression."[68]
Live missile or bomb detonation
A review of recorded data from long-range and airport surveillance radars revealed multiple contacts of airplanes/objects in TWA 800's vicinity at the time of the accident.[69] None of these contacts intersected TWA 800's position at any time.[70] Attention was drawn to data from the Islip, New York, ARTCC facility that showed three tracks in the vicinity of TWA 800 that did not appear in any of the other radar data.[71] None of these sequences intersected TWA 800's position at any time either.[71] All the reviewed radar data showed no radar returns consistent with a missile or other projectile traveling toward TWA 800.[70]
The NTSB addressed allegations that the Islip radar data showed groups of military surface targets converging in a suspicious manner in an area around the accident, and that a 30-knot radar track, never identified and 3 nmi from the crash site, was involved in foul play, as evidenced by its failure to divert from its course and assist with the search and rescue operations.[71] Military records examined by the NTSB showed no military surface vessels within 15 nmi of TWA 800 at the time of the accident.[71] In addition, the records indicated that the closest area scheduled for military use and prohibited to civilian air traffic at the time of the accident, warning area W-387A/B, was 160 nmi south.[71]
The NTSB reviewed the 30-knot target track to try to determine why it did not divert from its course and proceed to the area where the TWA 800 wreckage had fallen. TWA 800 was behind the target, and with the likely forward-looking perspective of the target's occupant(s), the occupants would not have been in a position to observe the aircraft's breakup and/or subsequent explosions/fireball(s).[72] Additionally, it was unlikely that the occupants of the target track would have been able to hear the explosions over the sound of its engines and the noise of the hull traveling through water, even more so if the occupants were in an enclosed bridge or cabin.[72] Further, review of the Islip radar data for other similar summer days and nights in 1999 indicated that the 30-knot track was consistent with normal commercial fishing, recreational, and/or cargo vessel traffic.[72]
-
Radar data showing vehicle and/or object tracks within 10 nm of TWA flight 800 just before the accident.[73]
-
Three sequences of primary returns near TWA 800 that were only recorded by the Islip radar.[74]
-
Primary radar returns that appeared near the TWA 800 after 20:31:12. The 30-knot track is at the bottom center of the image.[75]
Trace amounts of explosive residue were detected on three samples of material from three separate locations of the recovered airplane wreckage (described by the FBI as a piece of canvas-like material and two pieces of a floor panel).[76] These samples were submitted to the FBI's laboratory in Washington, D.C., which determined that one sample contained traces of cyclotrimethylenetrinitramine (RDX), another nitroglycerin, and the third a combination of RDX and pentaerythritol tetranitrate (PETN);[76] these findings received much media attention at the time.[77][78] In addition, the backs of several damaged passenger seats were observed to have an unknown red/brown-shaded substance on them.[76] However, according to the seat manufacturer, the locations and appearance of this substance were consistent with adhesive used in the construction of the seats, and additional laboratory testing by NASA identified the substance as being consistent with adhesives.[76]
Further examination of the airplane structure, seats, and other interior components found no damage typically associated with a high-energy explosion of a bomb or missile warhead ("severe pitting, cratering, petalling, or hot gas washing").[79] This included the pieces on which trace amounts of explosives were found.[79] Of the 5 percent of the fuselage that was not recovered, none of the missing areas were large enough to have covered all the damage that would have been caused by the detonation of a bomb or missile.[79] None of the victims' remains showed any evidence of injuries that could have been caused by high-energy explosives.[79]
The NTSB considered the possibility that the explosive residue was due to contamination from the aircraft's use in 1991 transporting troops during the Gulf War or its use in a dog-training explosive detection exercise about one month before the accident.[80] However, testing conducted by the FAA's Technical Center indicated that residues of the type of explosives found on the wreckage would dissipate completely after 2 days of immersion in sea water (almost all recovered wreckage was immersed longer than 2 days).[81] The NTSB concluded that it was "quite possible" that the explosive residue detected was transferred from military ships or ground vehicles, or the clothing and boots of military personnel, onto the wreckage during or after the recovery operation and was not present when the aircraft crashed into the water.[81]
Although it was unable to determine the exact source of the trace amounts of explosive residue found on the wreckage, the lack of any other corroborating evidence associated with a high-energy explosion led the NTSB to conclude that "the in-flight breakup of TWA flight 800 was not initiated by a bomb or missile strike."[81]
Fuel/air explosion in the center wing fuel tank
![](http://upload.wikimedia.org/wikipedia/commons/thumb/9/92/Center_Wing_Fuel_Tank.png/220px-Center_Wing_Fuel_Tank.png)
In order to evaluate the sequence of structural breakup of the airplane, the NTSB formed the Sequencing Group,[83] which examined individual pieces of the recovered structure, two-dimensional reconstructions or layouts of sections of the airplane, and various-sized three-dimensional reconstructions of portions of the airplane.[83] In addition, the locations of pieces of wreckage at the time of recovery and differences in fire effects on pieces that are normally adjacent to each other were evaluated.[83] The Sequencing Group concluded that the first event in the breakup sequence was a fracture in the wing center section of the aircraft, caused by an "overpressure event" in the center wing fuel tank (CWT).[84] An overpressure event was defined as a rapid increase in pressure resulting in failure of the structure of the CWT.[85]
Because there was no evidence that a high-energy explosive device detonated in this (or any other) area of the airplane, this overpressure event could only have been caused by a fuel/air explosion in the CWT.[86] Although only a small amount of fuel was present in the CWT of TWA 800,[citation needed] tests recreating the conditions of the flight showed the remaining fuel/air vapor to be flammable.[86] A major reason for the flammability of the fuel/air vapor in the CWT of the 747 was the large amount of heat generated and transferred to the CWT by air conditioning packs located directly below the tank;[87] with the CWT temperature raised to a sufficient level, a single ignition source could cause an explosion.[87]
Computer modeling[88] and scale model testing[89] were used to predict and demonstrate how an explosion would progress in a 747 CWT. During this time, quenching was identified as an issue, where the explosion would extinguish itself as it passed through the complex structure of the CWT.[89] Because the research data regarding quenching was limited, a complete understanding of quenching behavior was not possible, and the issue of quenching remained unresolved.[90]
In order to better determine whether a fuel/air vapor explosion in the CWT would generate sufficient pressure to break apart the fuel tank and lead to the destruction of the airplane, tests were conducted in July and August 1997, using a retired Air France 747 at Bruntingthorpe Airfield, England. These tests simulated a fuel/air explosion in the CWT by igniting a propane/air mixture; this resulted in the failure of the tank structure due to overpressure.[86] While the NTSB acknowledged that the test conditions at Bruntingthorpe were not fully comparable to the conditions that existed on TWA 800 at the time of the accident,[86] previous fuel explosions in the CWTs of commercial airliners such as Avianca Flight 203 and Philippine Airlines Flight 143 confirmed that a CWT explosion could break apart the fuel tank and lead to the destruction of an airplane.[86]
Ultimately, based on "the accident airplane's breakup sequence; wreckage damage characteristics; scientific tests and research on fuels, fuel tank explosions, and the conditions in the CWT at the time of the accident; and analysis of witness information,"[91] the NTSB concluded that "the TWA flight 800 in-flight breakup was initiated by a fuel/air explosion in the CWT."[91]
In-flight breakup sequence and crippled flight
Recovery locations of the wreckage from the ocean (the red, yellow, and green zones) clearly indicated that: (1) the red area pieces (from the forward portion of the wing center section and a ring of fuselage directly in front) were the earliest pieces to separate from the airplane; (2) the forward fuselage section departed simultaneously with or shortly after the red area pieces, landing relatively intact in the yellow zone; (3) the green area pieces (wings and the aft portion of the fuselage) remained intact for a period after the separation of the forward fuselage, and impacted the water in the green zone.[92]
Fire damage and soot deposits on the recovered wreckage indicated that some areas of fire existed on the airplane as it continued on in crippled flight after the loss of the forward fuselage.[93] After about 34 seconds (based on information from witness documents), the outer portions of both the right and left wings failed,[93] likely causing fuel-fed fires that were the beginning of the fireball described by witnesses.[94] Shortly after, the left wing separated from what remained of the main fuselage, which resulted in further development of the fuel-fed fireballs as the pieces of wreckage fell to the ocean.[94]
Only the FAA radar facility in North Truro, Massachusetts, using specialized processing software from the United States Air Force 84th Radar Evaluation Squadron, was capable of estimating the altitude of TWA 800 after it lost power due to the CWT explosion.[95] However, because of accuracy limitations, this radar data could not be used to determine whether the aircraft climbed after the nose separated.[95] Instead, the NTSB conducted a series of computer simulations to examine the flightpath of the main portion of the fuselage.[96] Hundreds of simulations were run using various combinations of possible times the nose of TWA 800 separated (the exact time was unknown), different models of the behavior of the crippled aircraft (the aerodynamic properties of the aircraft without its nose could only be estimated), and longitudinal radar data (the recorded radar tracks of the east/west position of TWA 800 from various sites differed).[97] These simulations indicated that after the loss of the forward fuselage the remainder of the aircraft continued on in crippled flight, then pitched up while rolling to the left (north),[94] climbing to a maximum altitude between 15,537 feet (4,736 m) and 16,678 feet (5,083 m)[98] from its last recorded altitude, 13,760 feet (4,190 m).[21]
Analysis of reported witness observations
At the start of FBI's investigation, because of the possibility that international terrorists might have been involved, assistance was requested from the Central Intelligence Agency (CIA).[99] CIA analysts, relying on sound-propagation analysis, were able to conclude that the witnesses could not be describing a missile approaching an intact aircraft, but were seeing a trail of burning fuel coming from the aircraft after the initial explosion.[100] This conclusion was reached after calculating how long it took for the sound of the initial explosion to reach the witnesses, and using that to correlate the witness observations with the accident sequence.[101] In all cases the witnesses could not be describing a missile approaching an intact aircraft, as the plane had already exploded before their observations began.[102]
As the investigation progressed, the NTSB decided to form a witness group to more fully address the accounts of witnesses.[103] From November 1996, through April 1997, this group reviewed witness documents on loan from the FBI (with personal information redacted), and conducted interviews with crewmembers from a New York Air National Guard HH-60 helicopter and C-130 airplane, as well as a U.S. Navy P-3 airplane that were flying in the vicinity of TWA 800 at the time of the accident.[104]
In February 1998, the FBI, having closed its active investigation, agreed to fully release the witness documents to the NTSB.[105] With access to these documents no longer controlled by the FBI, the NTSB formed a second witness group to review the documents.[105] Because of the amount of time that had elapsed (about 21 months) before the NTSB received information about the identity of the witnesses, the witness group chose not to re-interview most of the witnesses, but instead to rely on the original FBI documents as the best available evidence of the observations initially reported by the witnesses.[58] However, despite the two and a half years that had elapsed since the accident, the witness group did interview the captain of Eastwind Airlines flight 507, who was the first to report the explosion of TWA 800, because of his vantage point and experience as an airline pilot.[106]
The NTSB's review of the released witness documents determined that they contained 736 witness accounts, of which 258 were characterized as "streak of light" witnesses ("an object moving in the sky...variously described [as] a point of light, fireworks, a flare, a shooting star, or something similar.")[58] The NTSB Witness Group concluded that the streak of light reported by witnesses might have been the actual airplane during some stage of its flight before the fireball developed, noting that most of the 258 streak of light accounts were generally consistent with the calculated flightpath of the accident airplane after the CWT explosion.[59]
However, 38 witnesses described a streak of light that ascended vertically, or nearly so, and these accounts "seem[ed] to be inconsistent with the accident airplane's flightpath."[107] In addition, 18 witnesses reported seeing a streak of light that originated at the surface, or the horizon, which did not "appear to be consistent with the airplane's calculated flightpath and other known aspects of the accident sequence."[107] Regarding these differing accounts, the NTSB noted that based on their experience in previous investigations "witness reports are often inconsistent with the known facts or with other witnesses' reports of the same events."[108] The interviews conducted by the FBI focused on the possibility of a missile attack; suggested interview questions given to FBI agents such as "Where was the sun in relation to the aircraft and the missile launch point?" and "How long did the missile fly?" could have biased interviewees' responses in some cases.[109] The NTSB concluded that given the large number of witnesses in this case, they "did not expect all of the documented witness observations to be consistent with one another."[110] and "did not view these apparently anomalous witness reports as persuasive evidence that some witnesses might have observed a missile."[111]
After missile visibility tests were conducted in April 2000, at Eglin Air Force Base, Fort Walton Beach, Florida,[112] the NTSB determined that if witnesses had observed a missile attack they would have seen: (1) a light from the burning missile motor ascending very rapidly and steeply for about 8 seconds; (2) the light disappearing for up to 7 seconds; (3) upon the missile striking the aircraft and igniting the CWT another light, moving considerably more slowly and more laterally than the first, for about 30 seconds; (4) this light descending while simultaneously developing into a fireball falling toward the ocean.[111] None of the witness documents described such a scenario.[111]
Because of their unique vantage points and/or the level of precision and detail provided in their accounts, five witness accounts generated special interest:[113] the pilot of Eastwind Airlines flight 507, the crew members in the HH-60 helicopter, a streak-of-light witness aboard US Airways flight 217, a land witness on the Beach Lane Bridge in Westhampton Beach, New York as well as a witness on a boat near Great Gun Beach.[114] Advocates of a missile-attack scenario asserted that some of these witnesses observed a missile;[115] however, analysis demonstrated that the observations were not consistent with a missile attack on TWA 800, but instead were consistent with these witnesses having observed some part of the in-flight fire and breakup sequence after the CWT explosion.[115]
The NTSB concluded that "the witness observations of a streak of light were not related to a missile and that the streak of light reported by most of these witnesses was burning fuel from the accident airplane in crippled flight during some portion of the post-explosion, preimpact breakup sequence".[111] The NTSB further concluded that "the witnesses' observations of one or more fireballs were of the airplane's burning wreckage falling toward the ocean".[111]
Possible ignition sources of the center wing fuel tank
In an attempt to determine what ignited the inflammable fuel/air vapor in the CWT and caused the explosion, the NTSB evaluated numerous potential ignition sources. All but one were considered very unlikely to have been the source of ignition.[116]
Missile fragment or small explosive charge
Although the NTSB had already reached the conclusion that a missile strike did not cause the structural failure of the airplane, the possibility that a missile could have exploded close enough to TWA 800 for a missile fragment to have entered the CWT and ignited the fuel/air vapor, yet far enough away not to have left any damage characteristic of a missile strike, was considered.[117] Computer simulations using missile performance data simulated a missile detonating in a location such that a fragment from the warhead could penetrate the CWT.[118] Based on these simulations the NTSB concluded that it was "very unlikely" that a warhead detonated in such a location where a fragment could penetrate the CWT, but no other fragments impact the surrounding airplane structure leaving distinctive impact marks.[118]
Similarly, the investigation considered the possibility that a small explosive charge placed on the CWT could have been the ignition source.[118] Testing by the NTSB and the British Defence Evaluation and Research Agency demonstrated that when metal of the same type and thickness of the CWT was penetrated by a small charge, there was petalling of the surface where the charge was placed, pitting on the adjacent surfaces, and visible hot gas washing damage in the surrounding area.[119] Since none of the recovered CWT wreckage exhibited these damage characteristics, and none of the areas of missing wreckage were large enough to encompass all the expected damage, the investigation concluded that this scenario was "very unlikely."[120]
Other potential sources
The NTSB also investigated whether the fuel/air mixture in the CWT could have been ignited by lightning strike, meteor strike, auto-ignition or hot surface ignition, a fire migrating to the CWT from another fuel tank via the vent system, an uncontained engine failure, a turbine burst in the air conditioning packs beneath the CWT, a malfunctioning CWT jettison/override pump, a malfunctioning CWT scavenger pump, or static electricity.[121] After analysis the investigation determined that these potential sources were "very unlikely" to have been the source of ignition.[116]
Fuel quantity indication system
The FAA and airplane manufacturers had assumed that a combustible fuel/air mixture would exist at all times in fuel tanks; consequently, airplane designers attempted to eliminate all possible sources of ignition in the fuel tanks. The primary means of ensuring this were to protect all devices from intrusion of vapor and to keep voltages and currents being used by the Fuel Quantity Indication System (FQIS) very small. In the case of the 747-100 series, the only wiring located inside the CWT was wiring associated with the FQIS.
In order for the FQIS to be the ignition source, a transfer of higher than normal voltage to the FQIS needed to have occurred, as well as some mechanism whereby the excess energy was released by the FQIS wiring into the CWT. While the NTSB determined that factors suggesting the likelihood of a short circuit event existed, they added that "neither the release mechanism nor the location of the ignition inside the CWT could be determined from the available evidence." Nonetheless, the NTSB concluded that "the ignition energy for the CWT explosion most likely entered the CWT through the FQIS wiring."
Though the FQIS itself was designed to prevent danger from its normal operation by minimizing voltages and currents, the innermost tube of the FQIS compensator showed damage similar to that of the compensator tube that was the ignition source for the surge tank fire that destroyed a 747 near Madrid in 1976.[122] This was not considered "proof" of a source of ignition. There was evidence of arcing in a wire bundle that included FQIS wiring that connected with the Center Wing Tank.[123] There was also arcing evidenced on two wires sharing a cable raceway with FQIS wiring at station 955.[123]
The Captain's Cockpit Voice Recorder channel showed two "dropouts" of background power harmonics in the second before the recording ended (with the separation of the nose).[124] This might well be the signature of an arc on cockpit wiring adjacent to the FQIS wiring. The captain commented on the "crazy" readings of the number 4 engine fuel flow gauge about 2-1/2 minutes before the CVR recording ended.[125] Finally, the Center Wing Tank fuel quantity gauge was recovered and indicated 640 pounds instead of the 300 pounds that had been loaded into that tank.[125] Experiments showed that applying power to a wire leading to the fuel quantity gauge can cause the digital display to change by several hundred pounds before the circuit breaker trips. Thus the gauge anomaly could have been caused by a short to the FQIS wiring.[125] The NTSB concluded that the most likely source of sufficient voltage to cause ignition was a short from damaged wiring, or within electrical components of the FQIS. As not all components and wiring were recovered, it was not possible to pin-point the source of the necessary voltage.
Conclusions
The NTSB investigation ended with the adoption of its final report on August 23, 2000. In it the Board determined that the probable cause of the TWA 800 accident was:[126]
[An] explosion of the center wing fuel tank (CWT), resulting from ignition of the inflammable fuel/air mixture in the tank. The source of ignition energy for the explosion could not be determined with certainty, but, of the sources evaluated by the investigation, the most likely was a short circuit outside of the CWT that allowed excessive voltage to enter it through electrical wiring associated with the fuel quantity indication system.
In addition to the probable cause, the NTSB found the following contributing factors to the accident:[126]
- The design and certification concept that fuel tank explosions could be prevented solely by precluding all ignition sources
- The certification of the Boeing 747 with heat sources located beneath the CWT with no means to reduce the heat transferred into the CWT or to render the fuel tank vapor non-combustible.
During the course of its investigation, and in its final report, the NTSB issued fifteen safety recommendations, mostly covering fuel tank and wiring-related issues.[127] Among the recommendations was that significant consideration should be given to the development of modifications such as nitrogen-inerting systems for new airplane designs and, where feasible, for existing airplanes.[128]
Alternative theories
The NTSB's conclusions about the cause of the TWA 800 disaster took four years and one month to be published. The FBI's earliest investigations and interviews, later used by the NTSB, were performed under the assumption of a missile attack, a fact noted in the NTSB's final report. Six months into the investigation, the NTSB's chairman, Jim Hall, was quoted as saying, "All three theories—a bomb, a missile or mechanical failure—remain."[129] Speculation was fueled in part by early descriptions, visuals, and eyewitness accounts of this jet disaster, including a sudden explosion and trails of fire in the sky; particularly, trails of fire moving in an upward direction.
The two most prevalent specific conspiracy theories around TWA 800 are that of a terrorist bomb on board, or a missile striking the plane (attributed by some to American armed forces and by others to non-state actors). Those supporting these alternative explanations for the crash typically claim that the NTSB's explanation was created as a cover-up; that the NTSB did not investigate sufficiently; or that the NTSB did not have all the evidence it should have had to reach the correct conclusion.
On June 19th 2013, a new documentary alleging that the investigation into the crash was a cover-up made news headlines with statements from six members of the original investigation team, now retired, who also filed a petition to reopen the probe.[130]
Aftermath
Many users of the Internet responded to the incident. The resulting web traffic set records for Internet activity in 1996. CNN's traffic quadrupled to 3.9 million hits per day. After the flight crashed, the website of The New York Times had its traffic increase to one and one half million hits per day, an increase by half of its previous rate. In 1996 few U.S. government websites were updated daily; the United States Navy's website regarding the crash was constantly updated and had detailed information about the salvage of the crash site.[131]
International Memorial
![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Twa-memorial6.jpg/250px-Twa-memorial6.jpg)
The TWA Flight 800 International Memorial was dedicated in a 2-acre (8,100 m2) parcel immediately adjoining the main pavilion at Smith Point County Park in Shirley, New York, on July 14, 2004. The memorial's coordinates are 40°44'4.04"N 72°51'37.15"W. Funds for the memorial were raised by the Families of TWA Flight 800 Association. David Busch of Busch Associates PC Bay Shore, New York designed the memorial. The memorial includes landscaped grounds, flags from the 13 countries of the victims, and a curved black granite memorial with the names engraved on one side and an illustration on the other of a wave releasing 230 seagulls into the sky. In July 2006 an abstract design of a 10-foot (3.0 m) high lighthouse in black granite designed by Harry Edward Seaman, who had lost his cousin in the crash, was added. The lighthouse sits above a tomb holding many of the victims' personal belongings.[132]
The wreckage is now permanently stored in an NTSB facility in Ashburn, Loudoun County, Virginia that was custom built for the purpose. The reconstructed aircraft is used to train accident investigators.[133][134] On July 17, 2008 the Secretary of Transportation visited the facility and announced a final rule designed to prevent more accidents caused by explosions in fuel tanks. The NTSB first recommended such a rule just five months after the Flight 800 accident and thirty-three years after a similar recommendation issued by the Civil Aeronautics Board Bureau of Safety on December 17, 1963, nine days after the crash of Pan Am Flight 214.[135] In 2009 Boeing advised the FAA that its new Boeing 787 Dreamliner could not meet the new safety standards. The FAA proposed to relax the safeguards for preventing sparks inside the fuel tank, calling them "impractical."[136]
Notable passengers
Some of the notable passengers on TWA 800 included:[137]
- Michel Breistroff, French hockey player
- Marcel Dadi, French guitarist
- David Hogan, American composer
- Courtney Johns, sister of DC Comics writer Geoff Johns, and his inspiration behind DC Comics' Stargirl
- Jed Johnson, interior designer and director of the 1977 movie Andy Warhol's Bad
- Pam Lychner, American crime victims' rights advocate and former TWA flight attendant
- Shannon Evian Lychner, Lychner's 10-year-old daughter
- Katherine Elizabeth "Katie" Lychner, Lychner's 8-year-old daughter
- Françoise Manchuelle, French historian
- Ana Maria, wife of saxophonist Wayne Shorter
- Rodolphe Mérieux, physician, son of Alain Mérieux
- Jack O'Hara, executive producer of ABC Sports[138]
- 16 members of the French club at Montoursville High School in Montoursville, Pennsylvania, and their five chaperones[139]
See also
- Pan Am Flight 214, an aircraft that suffered a fuel tank explosion after being hit by lightning
- Louis Freeh, Director of the FBI
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(help) - ^ Randolph M. Tauss. "The Crash of TWA Flight 800 - Solving the Mystery of the "Missile Sightings"" (PDF): pp. 5–6. Retrieved April 6, 2011.
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(help) - ^ Randolph M. Tauss. "The Crash of TWA Flight 800 - Solving the Mystery of the "Missile Sightings"" (PDF). Retrieved April 6, 2011.
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(help) - ^ Randolph M. Tauss. "The Crash of TWA Flight 800 - Solving the Mystery of the "Missile Sightings"" (PDF): pg. 6. Retrieved April 6, 2011.
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has extra text (help) - ^ a b National Transportation Safety Board. "Witness Group Chairman's Factual Report" (PDF). Docket No. ?, Exhibit 4-A: pg.10. Retrieved January 12, 2010.
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- ^ a b National Transportation Safety Board. "Aircraft Accident Report: In-flight Breakup Over the Atlantic Ocean Trans World Airlines Flight 800" (PDF). NTSB AAR-00/03 Final Report: 288. Retrieved June 18, 2008.
- ^ National Transportation Safety Board. "Aircraft Accident Report: In-flight Breakup Over the Atlantic Ocean Trans World Airlines Flight 800" (PDF). NTSB AAR-00/03 Final Report: 289. Retrieved June 18, 2008.
- ^ a b c National Transportation Safety Board. "Aircraft Accident Report: In-flight Breakup Over the Atlantic Ocean Trans World Airlines Flight 800" (PDF). NTSB AAR-00/03 Final Report: 290. Retrieved June 18, 2008.
- ^ a b National Transportation Safety Board. "Aircraft Accident Report: In-flight Breakup Over the Atlantic Ocean Trans World Airlines Flight 800" (PDF). Ntsb/aar-00/03: pg.308. Retrieved January 16, 2010.
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has extra text (help) - ^ CNN (January 17, 1997). "Six months later, still no answer to the TWA Flight 800 mystery". CNN. Retrieved June 18, 2008.
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has generic name (help) - ^ ABC (June 19, 2013). "TWA Flight 800 documentary hints at crash cover-up". Retrieved June 19, 2013.
- ^ Barboza, David. "Many Hits, Some Misses: The Post-Crash Web Rush." The New York Times. August 6, 1996. Retrieved on June 5, 2009.
- ^ Thomas K (July 18, 2006). "Remembering Flight 800". Newsday. Archived from the original on May 19, 2008. Retrieved June 18, 2008.
- ^ "Aircraft Boneyards". Boneyard. History Channel. Archived from the original on October 24, 2007. Retrieved August 9, 2007.
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(help) - ^ http://www.ntsb.gov/TC/facilityloc.htm#wreckage
- ^ "Pan Am Flight 214 CAB report (PDF) (Historical Aircraft Accident, 1963, Pan Am)" (PDF).[dead link]
- ^ FAA to loosen fuel-tank safety rules, benefiting Boeing's 787 The Seattle Times February 8, 2009
- ^ The Associated Press (August 27, 1996). "Passenger List: TWA Flight 800". WashingtonPost.com. Retrieved June 18, 2008.
- ^ Sandomir, Richard (November 13, 1998). "Courtside Memorial For Producer's Family". TV Sports. The New York Times. Retrieved July 30, 2012.
- ^ Burnstein B (July 17, 2006). "Town still mourns 10 years after TWA 800". CNN. Retrieved June 18, 2008.
External links
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- National Transportation Safety Board
- CIA analysis of witness observations
- TWA Flight 800: United States Navy (Archive)
- Trans World Airlines Flight 800: Federal Bureau of Investigation New York Field Office (Archive)
- Boeing Statement Following the First Day of the NTSB's Flight 800 Sunshine Meeting - Boeing
- Learning from a Tragedy: Explosions and Flight 800
- CNN portal: TWA Flight 800
- TWA Flight 800 Victims: Who Were They?
- "After the Crash" - Houston Press
- Aviation accidents and incidents in 1996
- Brookhaven, New York
- Trans World Airlines accidents and incidents
- Airliner accidents and incidents involving in-flight explosions
- 1996 in New York
- Accidents and incidents involving the Boeing 747
- 1996 disasters in the United States
- Airliner accidents and incidents in New York