Tenerife Disaster
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The Tenerife airport disaster occurred on 27 March 1977, when two
Boeing 747 The Boeing 747 is a long-range wide-body aircraft, wide-body airliner designed and manufactured by Boeing Commercial Airplanes in the United States between 1968 and 2023. After the introduction of the Boeing 707, 707 in October 1958, Pan Am ...
passenger jets collided on the
runway In aviation, a runway is an elongated, rectangular surface designed for the landing and takeoff of an aircraft. Runways may be a human-made surface (often asphalt concrete, asphalt, concrete, or a mixture of both) or a natural surface (sod, ...
at Los Rodeos Airport (now Tenerife North–Ciudad de La Laguna Airport) on the
Spanish Spanish might refer to: * Items from or related to Spain: **Spaniards are a nation and ethnic group indigenous to Spain **Spanish language, spoken in Spain and many countries in the Americas **Spanish cuisine **Spanish history **Spanish culture ...
island of
Tenerife Tenerife ( ; ; formerly spelled ''Teneriffe'') is the largest and most populous island of the Canary Islands, an Autonomous communities of Spain, autonomous community of Spain. With a land area of and a population of 965,575 inhabitants as of A ...
. The incident occurred at 5:06 pm WET (
UTC Coordinated Universal Time (UTC) is the primary time standard globally used to regulate clocks and time. It establishes a reference for the current time, forming the basis for civil time and time zones. UTC facilitates international communica ...
+0) in dense fog, when KLM Flight 4805 initiated its
takeoff Takeoff is the phase of flight in which an aerospace vehicle leaves the ground and becomes airborne. For aircraft traveling vertically, this is known as liftoff. For aircraft that take off horizontally, this usually involves starting with a tr ...
run, colliding with the right side of Pan Am Flight 1736 still on the runway. The impact and the resulting fire killed all 248 people on board the
KLM KLM Royal Dutch Airlines, or simply KLM (an abbreviation for their official name Koninklijke Luchtvaart Maatschappij N.V. , ),
plane and 335 of the 396 people on board the
Pan Am Pan American World Airways, originally founded as Pan American Airways and more commonly known as Pan Am, was an airline that was the principal and largest international air carrier and unofficial overseas flag carrier of the United States for ...
plane, with only 61 survivors in the front section of the latter aircraft. With a total of 583 fatalities, the disaster is the deadliest accident in aviation history. The two aircraft had landed at Los Rodeos earlier that Sunday, and were among a number of aircraft diverted to Los Rodeos due to a bomb explosion at their intended destination of
Gran Canaria Airport Gran Canaria Airport () is a passenger and freight airport on the island of Gran Canaria. It is an important airport within the Spanish air transport network (owned and managed by a public enterprise, AENA), as it holds the sixth position in te ...
. Los Rodeos had become congested with parked airplanes blocking the only
taxiway A taxiway is a path for aircraft at an airport connecting runways with Airport apron, aprons, hangars, Airport terminal, terminals and other facilities. They mostly have a hard surface such as Asphalt concrete, asphalt or concrete, although sma ...
, forcing departing aircraft to taxi on the runway. Patches of thick fog were drifting across the airfield, so visibility was greatly reduced for pilots and the
control tower Air traffic control (ATC) is a service provided by ground-based air traffic controllers who direct aircraft on the ground and through a given section of controlled airspace, and can provide advisory services to aircraft in non-controlled a ...
. A subsequent investigation by Spanish authorities concluded that the primary cause of the accident was the KLM captain's decision to take off in the mistaken belief that a takeoff clearance from
air traffic control Air traffic control (ATC) is a service provided by ground-based air traffic controllers who direct aircraft on the ground and through a given section of controlled airspace, and can provide advisory services to aircraft in non-controlled air ...
(ATC) had been issued. Dutch investigators placed a greater emphasis on a mutual misunderstanding in radio communications between the KLM crew and ATC, but ultimately KLM admitted that their crew was responsible for the accident and the airline agreed to financially compensate the relatives of all of the victims. The accident had a lasting influence on the industry, highlighting in particular the vital importance of using standard phraseology in radio communications. Cockpit procedures were also reviewed, contributing to the establishment of crew resource management as a fundamental part of airline pilots' training. The captain is no longer considered infallible, and combined crew input is encouraged during aircraft operations.


Flight history

Tenerife was an unscheduled stop for both flights. Their destination was
Gran Canaria Airport Gran Canaria Airport () is a passenger and freight airport on the island of Gran Canaria. It is an important airport within the Spanish air transport network (owned and managed by a public enterprise, AENA), as it holds the sixth position in te ...
(also known as Las Palmas Airport or Gando Airport), serving
Las Palmas Las Palmas (, ; ), officially Las Palmas de Gran Canaria, is a Spanish city and capital of Gran Canaria, in the Canary Islands, in the Atlantic Ocean. It is the capital city of the Canary Islands (jointly with Santa Cruz de Tenerife) and the m ...
on the nearby island of
Gran Canaria Gran Canaria (, ; ), also Grand Canary Island, is the third-largest and second-most-populous island of the Canary Islands, a Spain, Spanish archipelago off the Atlantic coast of Northwest Africa. the island had a population of that constitut ...
.


KLM Flight 4805

KLM Flight 4805 was a
charter flight Air charter is the business of renting an entire aircraft (i.e., chartering) as opposed to individual aircraft seats (i.e., purchasing a ticket through a traditional airline). Regulation Charter – also called air taxi or ad hoc – flights ...
for Holland International Travel Group and had arrived from
Amsterdam Airport Schiphol Amsterdam Airport Schiphol , known informally as Schiphol Airport (, ), is the main international airport of the Netherlands, and is one of the major hubs for the SkyTeam airline alliance. It is located southwest of Amsterdam, in the municipal ...
,
Netherlands , Terminology of the Low Countries, informally Holland, is a country in Northwestern Europe, with Caribbean Netherlands, overseas territories in the Caribbean. It is the largest of the four constituent countries of the Kingdom of the Nether ...
. Its cockpit crew consisted of
Captain Captain is a title, an appellative for the commanding officer of a military unit; the supreme leader or highest rank officer of a navy ship, merchant ship, aeroplane, spacecraft, or other vessel; or the commander of a port, fire or police depa ...
Jacob Veldhuyzen van Zanten (age 50), First Officer Klaas Meurs (42), and Flight Engineer Willem Schreuder (48). At the time of the accident, Veldhuyzen van Zanten was KLM's chief flight instructor, with 11,700 flight hours, of which 1,545 hours were on the 747. Meurs had 9,200 flight hours, of which 95 hours were on the 747. Schreuder had 17,031 flight hours, of which 543 hours were on the 747. The aircraft was a Boeing 747-206B, registration PH-BUF, named ''Rijn (
Rhine The Rhine ( ) is one of the List of rivers of Europe, major rivers in Europe. The river begins in the Swiss canton of Graubünden in the southeastern Swiss Alps. It forms part of the Swiss-Liechtenstein border, then part of the Austria–Swit ...
)''. The KLM jet was carrying 14 crew members and 235 passengers, including 52 children. Most of the KLM passengers were Dutch; also on board were four Germans, two Austrians, and two Americans. After the aircraft landed at Tenerife, the passengers were transported to the
airport terminal An airport terminal is a main building at an airport where passengers transfer between ground transportation and the facilities that allow them to board and disembark from an Fixed-wing aircraft, aircraft. The buildings that provide access t ...
. One of the inbound passengers, Robina van Lanschot, who lived on the island with her boyfriend, chose not to re-board the 747, leaving 234 passengers on board.


Pan Am Flight 1736

Pan Am Flight 1736 was also a charter flight by Greek shipping company
Royal Cruise Line Royal Cruise Line was a Greek cruise line that operated from 1974 to 1996 and founded by Pericles Panagopoulos, Pericles Panagopulos. The line catered mainly to American passengers looking for an upscale cruise experience and sailed mainly worldwi ...
. It had originated at
Los Angeles International Airport Los Angeles International Airport is the primary international airport serving Los Angeles and its Greater Los Angeles, surrounding metropolitan area, in the U.S. state of California. LAX is located in the Westchester, Los Angeles, Westcheste ...
, with an intermediate stop at
New York New York most commonly refers to: * New York (state), a state in the northeastern United States * New York City, the most populous city in the United States, located in the state of New York New York may also refer to: Places United Kingdom * ...
's
John F. Kennedy International Airport John F. Kennedy International Airport is a major international airport serving New York City and its metropolitan area. JFK Airport is located on the southwestern shore of Long Island, in Queens, New York City, bordering Jamaica Bay. It is ...
(JFK). The aircraft was a Boeing 747-121, registration N736PA, named ''Clipper Victor''. Of the 380 passengers (mostly of retirement age but including two children), 14 had boarded in New York, where the crew was also changed. All but five passengers onboard the aircraft were Americans; the non-American passengers were all Canadian nationals. They were on their way to board the cruise ship ' for a 14-day trip across the Mediterranean. The new crew consisted of Captain Victor Grubbs (age 56), First Officer Robert Bragg (39), Flight Engineer George Warns (46), and 13 flight attendants. At the time of the accident, Grubbs had 21,043 hours of flight time, of which 564 hours were on the 747. Bragg had 10,800 flight hours, of which 2,796 hours were on the 747. Warns had 15,210 flight hours, of which 559 hours were on the 747. ''Clipper Victor'' was a historically notable plane, as it was the first Boeing 747 to operate a commercial airline flight when it flew from John F. Kennedy Airport to London Heathrow on January 21, 1970. On August 2, 1970, in its first year of service, it also became the first 747 to be hijacked: en route between JFK and
Luis Muñoz Marín International Airport Luis Muñoz Marín International Airport (Spanish language, Spanish: ''Aeropuerto Internacional Luis Muñoz Marín'') , previously known as Isla Verde International Airport (Spanish language, Spanish: ''Aeropuerto Internacional de Isla Verde''), ...
in
San Juan, Puerto Rico San Juan ( , ; Spanish for "Saint John the Baptist, John") is the capital city and most populous Municipalities of Puerto Rico, municipality in the Commonwealth (U.S. insular area), Commonwealth of Puerto Rico, an unincorporated territory of the ...
, it was diverted to
José Martí International Airport José Martí International Airport , sometimes known by its former name Rancho Boyeros Airport (''Aeropuerto de Rancho Boyeros''), (Spanish language, Spanish: ''Aeropuerto Internacional José Martí'') is an international airport located in the ...
in
Havana Havana (; ) is the capital and largest city of Cuba. The heart of La Habana Province, Havana is the country's main port and commercial center.Cuba Cuba, officially the Republic of Cuba, is an island country, comprising the island of Cuba (largest island), Isla de la Juventud, and List of islands of Cuba, 4,195 islands, islets and cays surrounding the main island. It is located where the ...
.


Accident


Diversion of aircraft to Los Rodeos

Both flights had been routine until they approached the islands. At 13:15, a
bomb A bomb is an explosive weapon that uses the exothermic reaction of an explosive material to provide an extremely sudden and violent release of energy. Detonations inflict damage principally through ground- and atmosphere-transmitted mechan ...
planted by the separatist
Canary Islands Independence Movement The Movement for the Self-Determination and Independence of the Canary Archipelago (, MPAIAC), was a Canarian nationalist and socialist organization, founded in 1964 by Antonio Cubillo, whose objective was the secession of the Canary Islands fro ...
exploded in the terminal of Gran Canaria Airport, injuring eight people. Due to the threat of a second bomb, the civil aviation authorities closed the airport temporarily after the initial explosion, and all incoming flights bound for Gran Canaria were diverted to Los Rodeos, including the two aircraft involved in the disaster. The Pan Am crew indicated that they would prefer to circle in a holding pattern until landing clearance was given (they had enough fuel to safely stay in the air for two more hours), but they were ordered to divert to Tenerife. Los Rodeos was a regional airport that could not easily accommodate all of the traffic diverted from Gran Canaria, which included five large airliners. The airport had only one
runway In aviation, a runway is an elongated, rectangular surface designed for the landing and takeoff of an aircraft. Runways may be a human-made surface (often asphalt concrete, asphalt, concrete, or a mixture of both) or a natural surface (sod, ...
and one major
taxiway A taxiway is a path for aircraft at an airport connecting runways with Airport apron, aprons, hangars, Airport terminal, terminals and other facilities. They mostly have a hard surface such as Asphalt concrete, asphalt or concrete, although sma ...
running parallel to it, with four short taxiways connecting the two. While waiting for Gran Canaria airport to reopen, the diverted airplanes took up so much space that they had to park on the long taxiway, making it unavailable for the purpose of
taxiing Taxiing (rarely spelled taxying) is the movement of an aircraft on the ground, under its own power, in contrast to towing or pushback (aviation), pushback where the aircraft is moved by a tug. The aircraft usually moves on wheels, but the term ...
. Instead, departing aircraft needed to taxi along the runway to position themselves for takeoff, a procedure known as a backtaxi or backtrack. The authorities reopened Gran Canaria airport once the bomb threat had been contained. The Pan Am plane was ready to depart from Tenerife, but access to the runway was obstructed by the KLM plane and a refueling vehicle; the KLM captain had decided to fully refuel at Los Rodeos instead of Las Palmas, apparently to save time. The Pan Am aircraft was unable to maneuver around the refueling KLM in order to reach the runway for takeoff, due to a lack of safe clearance between the two planes, which was just . The refueling took about 35 minutes, after which the passengers were brought back to the aircraft. The search for a missing Dutch family of four, who had not returned to the waiting KLM plane, delayed the flight even further. Additionally, Robina van Lanschot, a tour guide, had chosen not to reboard for the flight to Las Palmas, because she lived on Tenerife and thought it impractical to fly to Gran Canaria only to return to Tenerife the next day. She was therefore not on the KLM plane when the accident happened, and was the only survivor of those who flew from Amsterdam to Tenerife on Flight 4805.


Taxiing and takeoff preparations

The tower instructed the KLM plane to taxi down the entire length of the runway and then make a 180° turn to get into takeoff position. While the KLM was backtaxiing on the runway, the controller asked the flight crew to report when it was ready to copy the ATC clearance. Because the flight crew was performing the checklist, copying the clearance was postponed until the aircraft was in takeoff position. Shortly afterward, the Pan Am was instructed to follow the KLM down the same runway, exit it by taking the third exit on their left and then use the parallel taxiway. Initially, the crew was unclear as to whether the controller had told them to take the first or third exit. The crew asked for clarification and the controller responded emphatically by replying: "The third one, sir; one, two, three; third, third one." The crew began the taxi and proceeded to identify the unmarked taxiways using an airport diagram as they reached them. The crew successfully identified the first two taxiways (C1 and C2), but their discussion in the cockpit indicated that they had not sighted the third taxiway (C3), which they had been instructed to use. There were no markings or signs to identify the runway exits and they were in conditions of poor visibility. The Pan Am crew appeared to remain unsure of their position on the runway until the collision, which occurred near the intersection with the fourth taxiway (C4). The angle of the third taxiway would have required the plane to perform a 148° turn, which would lead back toward the still-crowded main
apron An apron is a garment worn over other clothing to cover the front of the body to protect from liquids. They have several purposes, most commonly as a functional accessory that protects clothes and skin from stains and marks. However, other typ ...
. At the end of C3, the Pan Am would have to make another 148° turn to continue taxiing towards the start of the runway, similar to a mirrored letter Z. Taxiway C4 would have required two 35° turns. A study carried out by the
Air Line Pilots Association The Air Line Pilots Association, International (ALPA) is the largest pilot union in the world, representing more than 79,000 pilots from 42 US and Canadian airlines. ALPA was founded on 27 July 1931 and is a member of the AFL-CIO and the Canadian ...
(ALPA) after the accident concluded that making the second 148° turn at the end of taxiway C3 would have been "a practical impossibility". The official report from the Spanish authorities explained that the controller instructed the Pan Am aircraft to use the third taxiway because this was the earliest exit that they could take to reach the unobstructed section of the parallel taxiway. These instructions issued by the airport controllers indicated their lack of familiarity with the difficulty of handling large aircraft such as the 747. In an interview years later, First Officer Bragg said he believed that the airport controllers saw the plane pass the first taxiway and their instructions to turn on the third taxiway were intended to mean the third taxiway they saw after the first one, which would've been taxiway C4.


Weather conditions at Los Rodeos

Los Rodeos airport is at above
sea level Mean sea level (MSL, often shortened to sea level) is an mean, average surface level of one or more among Earth's coastal Body of water, bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical ...
, which gives rise to weather conditions that differ from those at many other airports. Clouds at above ground level at the nearby coast are at ground level at Los Rodeos. Drifting clouds of different densities cause wildly varying visibilities, from unhindered at one moment to below the legal minimum the next. The collision took place in a high-density cloud. The Pan Am crew found themselves in poor and rapidly deteriorating visibility almost as soon as they entered the runway. According to the ALPA report, as the Pan Am aircraft taxied to the runway, the visibility was about . Shortly after they turned onto the runway it decreased to less than . Meanwhile, the KLM plane was still in good visibility, but with clouds blowing down the runway towards them. The aircraft completed its 180-degree turn in relatively clear weather and lined up on Runway 30. The next cloud was down the runway and moving towards the aircraft at about .


Communication misunderstandings

Immediately after lining up, the KLM captain advanced the throttles and the aircraft started to move forward. Meurs advised him that ATC clearance had not yet been given and Veldhuyzen van Zanten responded: "No, I know that. Go ahead, ask." Meurs then radioed the tower that they were "ready for takeoff" and "waiting for our ATC clearance". ATC radioed the KLM aircraft (addressing them by the wrong call sign, although the KLM still interpreted the transmission as theirs), providing instructions that specified the route that the aircraft was to follow after takeoff, but did not clear them for takeoff. To add to the confusion, the controller had used the word "takeoff" in his clearance, potentially convincing Veldhuyzen van Zanten that a takeoff clearance had been issued. Meurs read the flight clearance back to the controller, completing the readback with the statement "We are now at takeoff", although it is still not known whether "We are at takeoff" or "We are taking off" was said. Veldhuyzen van Zanten interrupted the first officer's readback with the comment "We're going." The controller, who could not see the runway due to the fog and did not have any ground radar to use at the airport, initially responded with "OK" (terminology that is nonstandard), which reinforced the KLM captain's misinterpretation that they had takeoff clearance. The controller's response of "OK" to the first officer's nonstandard statement that they were "now at takeoff" was likely due to his misinterpretation that they were in takeoff position and ready to begin the roll when takeoff clearance was received, but not in the process of taking off. The controller then immediately added, "Stand by for takeoff; I will call you", indicating that he had not intended the instruction to be interpreted as a takeoff clearance. A simultaneous radio call from the Pan Am crew caused mutual
interference Interference is the act of interfering, invading, or poaching. Interference may also refer to: Communications * Interference (communication), anything which alters, modifies, or disrupts a message * Adjacent-channel interference, caused by extra ...
on the radio frequency, which was audible in the KLM cockpit as a three-second-long shrill sound (or
heterodyne A heterodyne is a signal frequency that is created by combining or mixing two other frequencies using a signal processing technique called ''heterodyning'', which was invented by Canadian inventor-engineer Reginald Fessenden. Heterodyning is us ...
). This caused the KLM crew to miss the crucial latter portion of the tower's response. The Pan Am crew's transmission was "We're still taxiing down the runway, Clipper 1736!" This message was also blocked by the interference and inaudible to the KLM crew. Either message, if heard in the KLM cockpit, would have alerted the crew to the situation and given them time to abort the takeoff attempt. Due to the fog, neither crew was able to see the other plane on the runway ahead of them. In addition, neither of the aircraft could be seen from the control tower, as the airport was not equipped with ground radar. After the KLM plane had started its takeoff roll, the tower instructed the Pan Am crew to "report the runway clear." The Pan Am crew replied, "OK, will report when we're clear." Upon hearing this, the KLM flight engineer expressed his concern about the Pan Am not being clear of the runway by asking the pilots in his own cockpit, saying "Is he not clear, that Pan American?" Veldhuyzen van Zanten emphatically replied, "Oh, yes", and continued with the takeoff.


Collision

According to the
cockpit voice recorder A flight recorder is an electronic recording device placed in an aircraft for the purpose of facilitating the investigation of aviation accidents and incidents. The device may often be referred to colloquially as a "black box", an outdated nam ...
(CVR), the Pan Am captain said, "There he is!" when he spotted the KLM's landing lights through the fog just as his plane approached exit C4. When it became clear that the KLM aircraft was approaching at takeoff speed, Captain Grubbs exclaimed, "Goddamn, that son-of-a-bitch is coming!", while first officer Robert Bragg yelled, "Get off! Get off! Get off!" Grubbs applied full power to the throttles and made a sharp left turn towards the grass in an attempt to avoid the impending collision. By the time the KLM pilots saw the Pan Am aircraft, they had already exceeded their V1 speed and were moving too fast to stop. In desperation, the pilots prematurely rotated the aircraft nose upward and attempted to clear the Pan Am by lifting off, causing a
tailstrike In aviation, a tailstrike or tail strike occurs when the tail or empennage of an aircraft strikes the ground or other stationary object. This can happen with a fixed-wing aircraft with tricycle undercarriage, in both takeoff where the pilot r ...
. The KLM 747 was within of the Pan Am and moving at approximately when it left the ground. Its nose landing gear cleared the Pan Am, but its left-side engines, lower fuselage, and main landing gear struck the upper right side of the Pan Am's fuselage, ripping apart the center of the Pan Am jet almost directly above the wing. The right-side engines crashed through the Pan Am's upper deck immediately behind the cockpit, instantly killing all of the passengers seated there. The KLM plane remained briefly airborne, but the impact had sheared off the No. 1 engine (outer left), caused significant amounts of shredded materials to be ingested by the No. 2 engine (inner left), and damaged the wings. The plane immediately went into a stall, rolled sharply, and hit the ground approximately past the collision, sliding down the runway for a further . Upon impact with the runway, the full load of fuel, which had caused the earlier delay, ignited immediately into a fireball that could not be subdued for several hours. One of the 61 survivors of the Pan Am flight said that sitting in the nose of the plane probably saved his life: "We all settled back, and the next thing an explosion took place and the whole port side, left side of the plane, was just torn wide open." Veldhuyzen van Zanten was KLM's chief of flight training and one of their most senior pilots. About two months before the accident, he had conducted the Boeing 747 qualification check on the first officer of Flight 4805. His photograph was used for publicity materials such as magazine advertisements, including the inflight magazine on board PH-BUF. KLM had suggested initially that Veldhuyzen van Zanten should help with the investigation, unaware that he was the captain who had been killed in the accident.


Victims

Both airplanes were destroyed in the collision. All 248 passengers and crew aboard the KLM plane died, as did 335 passengers and crew (mostly the flight attendants and a purser) aboard the Pan Am plane, primarily due to the fire and explosions resulting from the fuel spilled and ignited in the impact. The other 61 passengers and crew aboard the Pan Am aircraft survived. There were initially 70 survivors, but 9 passengers later died of their injuries. Among the survivors were the captain, first officer, flight engineer, and four flight attendants. Most of the survivors on the Pan Am plane walked out onto the intact left wing, the side away from the collision, through holes in the fuselage structure. The Pan Am's engines were still running for a few minutes after the accident despite first officer Bragg's intention to turn them off. The roof of the cockpit, where the engine switches were located, had been destroyed in the collision, and all control lines were severed, leaving no means for the flight crew to control the aircraft's systems, including engine fire extinguishers. Survivors waited for rescue, but it did not come promptly, as the firefighters were initially unaware that there were two aircraft involved and were concentrating on the KLM wreck hundreds of metres away in the thick fog and smoke. Eventually, most of the survivors on the wing dropped to the ground below. The Pan Am flight fatalities included 53 travelers from
Orange County, California Orange County (officially the County of Orange; often initialized O.C.) is a county (United States), county located in the Los Angeles metropolitan area in Southern California, United States. As of the 2020 United States census, the population ...
, mostly retirees on package tours.


Notable fatalities

* Jacob Veldhuyzen van Zanten, chief flight instructor for KLM and the captain of the KLM flight. * Eve Meyer, a
pin-up model A pin-up model is a model whose mass-produced pictures and photographs have wide appeal within the popular culture of a society. Pin-up models are usually glamour, actresses, or fashion models whose pictures are intended for informal and aesth ...
, film actress and producer and second wife of film director
Russ Meyer Russell Albion Meyer (March 21, 1922 – September 18, 2004) was an American filmmaker. He was primarily known for writing and directing a successful series of sexploitation films featuring campy humor, sly satire and large-breasted women, wh ...
, was on the Pan Am flight. * A. P. Hamann, the former
city manager A city manager is an official appointed as the administrative manager of a city in the council–manager form of city government. Local officials serving in this position are referred to as the chief executive officer (CEO) or chief administ ...
of
San Jose, California San Jose, officially the City of San José ( ; ), is a cultural, commercial, and political center within Silicon Valley and the San Francisco Bay Area. With a city population of 997,368 and a metropolitan area population of 1.95 million, it is ...
, was on the Pan Am flight.


Aftermath

The following day, the Canary Islands Independence Movement, responsible for the bombing at Gran Canaria that started the chain of events that led to the disaster, denied responsibility for the accident. Los Rodeos Airport was closed to all
fixed-wing A fixed-wing aircraft is a heavier-than-air aircraft, such as an airplane, which is capable of flight using Lift (force), aerodynamic lift. Fixed-wing aircraft are distinct from rotorcraft, rotary-wing aircraft (in which a Helicopter rotor, r ...
traffic for two days. The first crash investigators to arrive at Tenerife the day after the crash travelled there by way of a 3-hour boat ride from Las Palmas. The first aircraft that was able to land was a
U.S. Air Force The United States Air Force (USAF) is the air service branch of the United States Department of Defense. It is one of the six United States Armed Forces and one of the eight uniformed services of the United States. Tracing its origins to 1 ...
C-130 The Lockheed C-130 Hercules is an American four-engine turboprop military transport aircraft designed and built by Lockheed Corporation, Lockheed (now Lockheed Martin). Capable of using unprepared runways for takeoffs and landings, the C-130 w ...
transport, which landed on the airport's main taxiway at 12:50 on March 29. The C-130 was arranged by Lt. Col Dr. James K. Slaton, who arrived before the crash investigators and started a
triage In medicine, triage (, ; ) is a process by which care providers such as Health professional, medical professionals and those with first aid knowledge determine the order of priority for providing treatment to injured individuals and/or inform th ...
of surviving passengers. Slaton was dispatched from Torrejon Air Base just outside of
Madrid, Spain Madrid ( ; ) is the capital and List of largest cities in Spain, most populous municipality of Spain. It has almost 3.5 million inhabitants and a Madrid metropolitan area, metropolitan area population of approximately 7 million. It i ...
. Slaton, a flight surgeon attached to the 613th Tactical Fighter Squadron, worked with local medical staff and remained on scene until the last survivor was airlifted to awaiting medical facilities. The C-130 transported all surviving and injured passengers from Tenerife airport to Las Palmas; many of the injured were taken from there to other Air Force bases in the U.S. for further treatment. Spanish Army soldiers were tasked with clearing crash wreckage from the runways and taxiways. By March 30, a small plane shuttle service was approved, but large jets still could not land. Los Rodeos was fully reopened on April 3, after wreckage had been removed from the runway and engineers had repaired it.


Investigation

The accident was investigated by Spain's
Civil Aviation Accident and Incident Investigation Commission The Civil Aviation Accident and Incident Investigation Commission (, CIAIAC) is the Spanish national agency responsible for air accident investigation. It is a division of the Ministry of Public Works and Transport. The CIAIAC investigates all a ...
(CIAIAC). About 70 personnel were involved in the investigation, including representatives from the United States, the Netherlands and the two airline companies. Facts showed that there had been misinterpretations and false assumptions before the accident. Analysis of the CVR transcript showed that the KLM captain thought that he had been cleared for takeoff, while the Tenerife control tower believed that the KLM 747 was stationary at the end of the runway, awaiting takeoff clearance.


Probable cause

The investigation concluded that the fundamental cause of the accident was that Veldhuyzen van Zanten attempted to take off without clearance. The investigators suggested the reason for this was a desire to leave as soon as possible in order to comply with KLM's duty-time regulations (which were put in place earlier that year) and before the weather deteriorated further. Other major factors contributing to the accident were: * A heavy and sudden fog greatly limited visibility and the control tower and the crews of both planes were unable to see one another. * Interference from simultaneous radio transmissions made hearing messages difficult. The following factors were considered contributing but not critical: * The use of ambiguous non-standard phrases by the KLM first officer ("We're at take off") and the Tenerife control tower ("OK"). * The Pan Am aircraft did not leave the runway at the third exit as instructed. * The airport was forced to accommodate a great number of large aircraft rerouted by the terrorist incident, disrupting the normal use of taxiways.


Dutch response

The Dutch authorities were reluctant to accept the Spanish report blaming the KLM captain for the accident. The Netherlands Department of Civil Aviation published a response that, while accepting that the KLM captain had taken off "prematurely", argued that he alone should not be blamed for the "mutual misunderstanding" that occurred between the controller and the KLM crew, and that limitations of using radio as a means of communication should have been given greater consideration. In particular, the Dutch response pointed out that: * The crowded airport had placed additional pressure on all parties, including the KLM cockpit crew, the Pan Am cockpit crew, and the controller; * Sounds on the CVR suggested that during the accident the Spanish control tower crew had been listening to a
football Football is a family of team sports that involve, to varying degrees, kick (football), kicking a football (ball), ball to score a goal (sports), goal. Unqualified, football (word), the word ''football'' generally means the form of football t ...
match on the radio and may have been distracted; * The transmission from the tower in which the controller passed KLM their ATC clearance was ambiguous and could have been interpreted as also giving take-off clearance. In support of this part of their response, the Dutch investigators pointed out that Pan Am's messages "No! Eh?" and "We are still taxiing down the runway, the Clipper 1736!" indicated that Grubbs and Bragg had recognized the ambiguity (this message was not audible to the control tower or KLM crew due to simultaneous cross-communication); * The Pan Am had taxied beyond the third exit. Had the plane turned at the third exit as instructed, the collision would not have occurred. Although the Dutch authorities were initially reluctant to blame Veldhuyzen van Zanten and his crew, the airline ultimately accepted responsibility for the accident. KLM paid the victims' families compensation ranging between $58,000 and $600,000 (or $ to $ million today, adjusted for inflation). The sum of settlements for property and damages was $110 million (or $ million today), an average of $189,000 (or $ today) per victim, due to limitations imposed by European Compensation Conventions in effect at the time.


Speculations

This was one of the first accident investigations to include a study into the contribution of "human factors". , p. 2 (PDF p. 6 of 97). "The study group notes with approval that the official report of the spanish government has, itself, included a section on human factors involved in this accident. We feel that this is an excellent beginning toward a better understanding of the causal factors of aviation accidents, an idea whose time has finally come." These included: * Veldhuyzen van Zanten, a KLM training captain and instructor for over ten years working on simulators regularly, had not flown on regular routes for twelve weeks prior to the accident. * The KLM flight crew, including Veldhuyzen van Zanten, were concerned about exceeding their maximum legally allowable on-duty hours for the day, which Dutch law had recently tightened. This influenced Veldhuyzen van Zanten's decision to refuel at Tenerife for the flight to Amsterdam after as brief a stop as possible at Las Palmas. * The apparent hesitation of the flight engineer and the first officer to challenge Veldhuyzen van Zanten further. The official investigation suggested that this might have been due to not only the captain's seniority in rank but also his being one of the most respected pilots working for the airline. The first officer had intervened when Veldhuyzen van Zanten first opened the throttles, but had then failed to do so on the second occasion. Even though the flight engineer had indeed asked the captain whether or not the Pan Am was clear of the runway, he seemed reassured by the captain's answer. The co-pilots had clearly challenged the captain's decisions, but were not insistent enough to convince him to abort the attempted takeoff. * The flight engineer was the only member of the KLM's flight crew to react to the control tower's instruction to "report the runway clear"; this might have been due to his having completed his pre-flight checks, whereas his colleagues were experiencing an increased workload, just as the visibility worsened. , p. 22 (PDF p. 26 of 97). "Both pilots were contending with heavy demands on their attention as the visibility rapidly worsened. The flight engineer, to the contrary, had completed the heaviest part of his workload and was now reverting to an instrument monitoring mode." * The ALPA study group concluded that the KLM crew did not realize that the transmission "Papa Alpha One Seven Three Six, report the runway clear" was directed at the Pan Am, because this was the first and only time the Pan Am was referred to by that name. Previously, the Pan Am had been called "Clipper One Seven Three Six", using its proper call-sign. , p. 22 (PDF p. 26 of 97). "It is our opinion that the flight engineer, like the pilots, did not perceive the message from the controller to the Pan Am asking them to report when runway clear. (Because of the use of the address "Papa Alpha)." The extra fuel taken on by the KLM added several factors: * Takeoff was delayed by an extra 35 minutes, allowing time for the fog to settle in; * More than 45
tonnes The tonne ( or ; symbol: t) is a unit of mass equal to 1,000  kilograms. It is a non-SI unit accepted for use with SI. It is also referred to as a metric ton in the United States to distinguish it from the non-metric units of the s ...
of additional weight was added to the aircraft, increasing the takeoff distance and making it more difficult to clear the Pan Am when taking off; * The increased severity of the fire caused by the additional fuel led ultimately to the deaths of all those on board.


Legacy

As a consequence of the accident, sweeping changes were made to international airline regulations and to aircraft. Aviation authorities around the world introduced requirements for standard phrases and a greater emphasis on English as a common
working language A working language (also procedural language) is a language that is given a unique legal status in a supranational company, society, state or other body or organization as its primary means of communication. It is primarily the language of the dai ...
. Air traffic instruction must not be acknowledged solely with a colloquial phrase such as "OK" or even "
Roger Roger is a masculine given name, and a surname. The given name is derived from the Old French personal names ' and '. These names are of Germanic languages">Germanic origin, derived from the elements ', ''χrōþi'' ("fame", "renown", "honour") ...
" (which simply means the last transmission was received), but with a readback of the key parts of the instruction, to show mutual understanding. The word "takeoff" is now spoken only when the actual takeoff clearance is given, or when canceling that same clearance (i.e., "cleared for takeoff" or "cancel takeoff clearance"). Until that point, aircrew and controllers should use the word "departure" in its place (e.g., "ready for departure"). Additionally, an ATC clearance given to an aircraft already lined-up on the runway must be prefixed with the instruction "hold position".
Cockpit A cockpit or flight deck is the area, on the front part of an aircraft, spacecraft, or submersible, from which a pilot controls the vehicle. The cockpit of an aircraft contains flight instruments on an instrument panel, and the controls th ...
procedures were also changed after the accident. Hierarchical relations among crew members were played down, and greater emphasis was placed on team decision-making by mutual agreement. Less experienced flight crew members were encouraged to challenge their captains when they believed something to be incorrect, and captains were instructed to listen to their crew and evaluate all decisions in light of crew concerns. This course of action was later expanded into what is known today as crew resource management (CRM), which states that all pilots, no matter how experienced they are, are allowed to contradict each other. CRM training has been mandatory for all airline pilots since 2006. In 1978, a second airport was opened on the island of Tenerife, the new Tenerife South Airport (TFS), which now serves the majority of international tourist flights. Los Rodeos, renamed Tenerife North Airport (TFN), was then used only for domestic and inter-island flights until 2002, when a new terminal was opened and Tenerife North began to carry international traffic again. The Spanish government installed a ground radar system at Tenerife North Airport following the accident.


Memorials

A Dutch national memorial and final resting place for the victims of the KLM plane is located in
Amsterdam Amsterdam ( , ; ; ) is the capital of the Netherlands, capital and Municipalities of the Netherlands, largest city of the Kingdom of the Netherlands. It has a population of 933,680 in June 2024 within the city proper, 1,457,018 in the City Re ...
, at Westgaarde cemetery. There is also a memorial at the Westminster Memorial Park and Mortuary in
Westminster, California Westminster is a city in western Orange County, California, United States. Westminster was founded in 1870 by Rev. Lemuel Webber as a Presbyterian Temperance movement, temperance colony and was incorporated in 1957. Westminster is bordered by ...
, US. In 1977, a cross in
Rancho Bernardo Rancho Bernardo is a master-planned community in the northern hills of San Diego County, California. Geography The topography of Rancho Bernardo consists of canyons and rolling hills that have large bedrock outcroppings. The major floral biomes ...
, San Diego, California was dedicated to 19 area residents who died in the disaster. In 2007, the 30th anniversary marked the first time that Dutch and American next-of-kin and aid helpers from Tenerife joined an international commemoration service, held at the Auditorio de Tenerife in Santa Cruz. The International Tenerife Memorial March 27, 1977 was inaugurated at the Mesa Mota on March 27, 2007. The monument was designed by Dutch sculptor Rudi van de Wint (1942–2006).


Documentaries

The disaster has been featured in many TV shows, podcasts and documentaries. These include: * Episode 1 of '' Survival in the Sky'', "Blaming the Pilot" (1996). * Episode 12 of ''
Seconds From Disaster ''Seconds from Disaster'' is a US/UK-produced documentary television programme that investigates historically relevant man-made and natural disasters from the 20th and early 21st centuries. Each episode aims to explain a single incident by anal ...
'', "Collision on the Runway" (2004). * Episode 625 of PBS's ''
NOVA A nova ( novae or novas) is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star (hence the name "nova", Latin for "new") that slowly fades over weeks or months. All observed novae involve white ...
'', "The Deadliest Plane Crash" (2006). * The PBS special ''Surviving Disaster: How the Brain Works Under Extreme Duress'' (2011), which was based on Amanda Ripley's book ''The Unthinkable: Who Survives When Disaster Strikes - and Why''. * An episode of '' Destroyed in Seconds''. * Episode 133 (S16E03) of the Canadian TV series ''
Mayday Mayday is an emergency procedure word used internationally as a distress signal in voice-procedure radio communications. It is used to signal a life-threatening emergency primarily by aviators and mariners, but in some countries local organiz ...
'' (known by different names in different countries), "Disaster at Tenerife" (2016), as well as the earlier in-depth 90-minute special "Crash of the Century" (2005). * Footage of the wreckage appears in the disaster documentary '' Days of Fury'' (1979), directed by Fred Warshofsky. * Episode 5 of the
Nebula A nebula (; or nebulas) is a distinct luminescent part of interstellar medium, which can consist of ionized, neutral, or molecular hydrogen and also cosmic dust. Nebulae are often star-forming regions, such as in the Pillars of Creation in ...
series ''Under Exposure'' (2023) by Neo. * Series 5 episodes 1 and 2 of the '' Cautionary Tales'' podcast (2025) by Pushkin Industries, hosted by
Tim Harford Timothy Douglas Harford (born 27 September 1973) is an English economic journalist who lives in Oxford.1982 Sukhumi Dranda Airport runway collision — similar in circumstances * List of accidents and incidents involving commercial aircraft *
1983 Madrid Airport runway collision The 1983 Madrid Airport runway collision occurred on 7December 1983 when a departing Iberia (airline), Iberia Boeing 727 struck an Aviaco McDonnell Douglas DC-9 at Adolfo Suárez Madrid–Barajas Airport, Madrid-Barajas Airport, causing the dea ...
*
1990 Wayne County Airport runway collision On December 3, 1990, two Northwest Airlines jetliners collided at Detroit Metropolitan Wayne County Airport. Flight 1482, a scheduled McDonnell Douglas DC-9, Douglas DC-9-14 operating from Detroit to Pittsburgh International Airport, taxiing, ta ...
*
2001 Linate Airport runway collision Scandinavian Airlines System Flight 686, a McDonnell Douglas MD-87 airliner carrying 110 people bound for Copenhagen, Denmark, collided on take-off with a Cessna Citation CJ2 business jet carrying four people bound for Paris, France, on 8  ...


Notes


References

* ''Collision on Tenerife: The How and Why of the World's Worst Aviation Disaster'' by Jon Ziomek (Post Hill Press, 2018).


External links


Official Spanish and Dutch accident reports
*
English translation of Spanish report and Dutch response
**
A-102/1977 y A-103/1977 Accidente Ocurrido el 27 de Marzo de 1977 a las Aeronaves Boeing 747, Matrícula PH-BUF de K.L.M. y Aeronave Boeing 747, matrícula N736PA de PANAM en el Aeropuerto de los Rodeos, Tenerife (Islas Canarias)
" – Hosted by the
Civil Aviation Accident and Incident Investigation Commission The Civil Aviation Accident and Incident Investigation Commission (, CIAIAC) is the Spanish national agency responsible for air accident investigation. It is a division of the Ministry of Public Works and Transport. The CIAIAC investigates all a ...

Human Factors Report on the Tenerife Accident
Air Line Pilots Association The Air Line Pilots Association, International (ALPA) is the largest pilot union in the world, representing more than 79,000 pilots from 42 US and Canadian airlines. ALPA was founded on 27 July 1931 and is a member of the AFL-CIO and the Canadian ...
of the United States
Archive
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Disaster A disaster is an event that causes serious harm to people, buildings, economies, or the environment, and the affected community cannot handle it alone. '' Natural disasters'' like avalanches, floods, earthquakes, and wildfires are caused by na ...
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