Spanair Flight 5022

Spanair Flight 5022

EC-HFP nicknamed "Sunbreeze", in Star Alliance livery, the aircraft involved in the incident at Barajas Airport in January 2008.
Accident summary
Date 20 August 2008
Summary Pilot error; stalled immediately after takeoff and crashed to the right of the runway due to improper wing configuration and failed of the R2-5 relay
Site Barajas Airport, Madrid, Spain
40°31′48″N 003°34′13″W / 40.53000°N 3.57028°W / 40.53000; -3.57028Coordinates: 40°31′48″N 003°34′13″W / 40.53000°N 3.57028°W / 40.53000; -3.57028
Passengers 166
Crew 6
Injuries (non-fatal) 18
Fatalities 154
Survivors 18
Aircraft type McDonnell Douglas MD-82
Operator Spanair
Flight origin Barcelona El-Prat Airport
Stopover Madrid-Barajas Airport
Destination Gran Canaria Airport

Spanair Flight 5022 (JK5022) was a scheduled domestic passenger flight from Barcelona-El Prat Airport to Gran Canaria Airport, Spain, via Madrid Barajas Airport that crashed just after take-off from runway 36L at Madrid Airport at 14:24 CEST (12:24 UTC) on 20 August 2008. The aircraft was a McDonnell Douglas MD-82, registration EC-HFP. 154 people died; six died en route to hospital, one died overnight and one died in hospital three days later. Only 18 people survived.[1][2]

It was the only fatal accident for Spanair (part of the SAS Group) in the 25-year history of the company, and the 14th fatal accident and 24th hull loss involving MD-80 series aircraft. It was the world's deadliest aviation accident in 2008 and Spain's deadliest since the 1983 crash of Avianca Flight 011.[3]

The accident weakened Spanair's image, which at the time was already negative among the public because of frequent breakdowns and delays.[4] The crash exacerbated financial difficulties at Spanair, which ceased operations on 27 January 2012.[5]

Crash

Map showing crash location

The aircraft, named Sunbreeze (registration EC-HFP;[6] manufacturer's serial number 53148),[7] had been acquired by Spanair in July 1999.[8]

The flight was a Star Alliance codeshare (carrying passengers booked by multiple airlines), operated on behalf of Lufthansa as LH 2554.[9] On board at takeoff were 166 passengers and six crew members.[10]

The accident occurred as the aircraft attempted to take off, at 14:24 local time,[6][11] due to the pilot's failure to deploy the flaps and slats as required for takeoff.[12][13] Without the use of these "high-lift" devices, the wings could not generate enough lift to keep the aircraft airborne.[Note 1] The MD-80 has a warning system (the Take-off warning system or TOWS) that should have alerted the pilots that the plane was not correctly configured for take-off. However, the warning did not sound, and the pilots continued with the attempt. The aircraft left the ground momentarily, rolled to the right,[15] and impacted the ground next to the runway. The wings separated from the aircraft and the fuselage broke into two main parts; the wings and the rear two-thirds of the fuselage were engulfed by fire.[16]

This was the flight's second attempted take-off: over an hour earlier, the pilots had attempted and aborted a departure because a sensor reported excessive temperatures in an air intake; that sensor was de-activated on the ground (reportedly an established procedure, as that sensor is redundant).[17] Another takeoff was then attempted, during which the accident occurred.[18]

Fatalities

Of the 172 people on board, 146, including all crew members, perished in the crash or immediately after in the fire; of the 26 passengers rescued alive from the crash site, six died before arriving at hospital, and two more in hospital, bringing the total number of fatalities to 154.[10][18][19][20][21][1][22]

135 of the deceased and 16 of the survivors were Spanish nationals; 19 of the deceased and 2 survivors were of other nationalities.[10] The deceased included German, French, Mauritanian, Turkish, Bulgarian, Gambian, Italian, Indonesian and Brazilian citizens.

The crash flung some of the survivors into a stream, lessening the severity of their burns.[23] A 30-year-old woman with British and Spanish dual citizenship survived with a punctured lung and broken left arm but no burns, as she was flung from row 6, still attached to her seat, into the stream.[24]

Nationalities of passengers and crew

NationalityPassengersCrewTotal
 Bolivia101
 Brazil202
 Bulgaria101
 Finland101
 France202
 Gambia101
 Germany505
 Indonesia101
 Italy101
 Mauritania101
 Spain1486154
 Mexico101
 Turkey101
Total1666172

Investigation

Summary

Sunbreeze, in an earlier standard Spanair livery, at Madrid on 10 October 2007.

The accident was investigated by the Civil Aviation Accident and Incident Investigation Commission (CIAIAC). Representatives from the US National Transportation Safety Board, the aircraft manufacturer Boeing (as successor to McDonnell Douglas, the original aircraft manufacturer), and the engine manufacturer Pratt and Whitney supported the investigation.[11]

A preliminary report on the accident was released by CIAIAC on 6 October 2008.[25] Flight data recorders showed that the aircraft had taken off with flaps at 0°, and that the alarm for that abnormal takeoff configuration had not sounded. The report hinted at no other cause of the accident. Both the engines and thrust reversers were excluded as causes of the accident.

On 17 August 2009, CIAIAC released an interim report on the incident.[26] The interim report confirmed the preliminary report's conclusion that the crash was caused by an attempt to take off with the flaps and slats retracted, which constituted an improper configuration, and noted that safeguards that should have prevented the crash failed to do so. The cockpit recordings revealed that the pilots omitted the "set and check the flap/slat lever and lights" item in the After Start checklist. In the Takeoff Imminent verification checklist the copilot had simply repeated the correct flap and slat position values without actually checking them, as shown by the physical evidence. All three safety barriers provided to avoid the takeoff in an inappropriate configuration were defeated: the configuration checklist, the confirm and verify checklist, and the Take-off Warning System (TOWS). The report also made a number of safety recommendations intended to prevent incidents like this from happening again.[27]

CIAIAC published a further progress note in August 2010,[28] and its final report in July 2011.

Theories

Fire or explosion

Some early eye-witness accounts suggested that the aircraft suffered an engine fire or explosion before crashing, but the Spanish airport authority AENA released a video showing that the engines neither exploded nor caught fire during take-off.[29][30] Manuel Bautista, Director General of Spain's civil aviation authority, went as far as to state: "The engine is not the cause of the accident",[29] surmising that a chain of events combining together was more likely than a single cause.[31]

Temperature sensor

There has been considerable interest in the faulty air temperature probe (the total air temperature sensor,[Note 2] located on the front of the aircraft near the cockpit) that initially caused the pilot to turn the plane back for maintenance before the second takeoff attempt.[32] The mechanic simply deactivated the probe because the aircraft's Minimum Equipment List allowed it to be left inoperative. On 22 August investigators interviewed the mechanic, who defended his action by saying that it had nothing to do with the crash. Spanair has supported the mechanic's view that deactivation of the probe is an accepted procedure.[33] On 1 September a report, quoting Spanair, stated that the problem detected on the first takeoff attempt was overheating caused by a temperature gauge's de-icing system, rather than a dysfunction of the temperature gauge itself, and that since icing was not a risk on that flight, the de-icing system had been deactivated by the mechanic with captain's approval.[34]

On 11 May 2010, details from the cockpit voice recorder were leaked to the public and released by Spanish media. The recording showed that both pilots were concerned about a repair job performed earlier on the day of the crash, in which mechanics used an ice pack to cool an overheating temperature sensor and removed a fuse.[35] The BBC reported that the judge investigating the crash was to question three mechanics on suspicion of manslaughter. These were the two mechanics who checked the plane before take-off and the head of maintenance for Spanair at Barajas.[36]

Thrust reverser

One theory was that the thrust reverser of the No. 2 (right side) engine activated during the climb , since one of the thrust reversers was seen to be in the deployed position in the wreckage.[37] The investigation concluded that the position of the thrust reverser was a result of the accident, not a cause of it.[38] If the reverser deployed during takeoff, and not as a result of impact, it has been suggested that the plane would have yawed suddenly to the right.[39] Aircraft engineer Alberto Garcia dismissed this suggestion, pointing out that the MD-82 has tail-mounted engines positioned close to each other and to the plane's longitudinal axis, so that any yaw from asymmetric thrust would be small.[37] Thrust reversers are normally employed just after touch down to reduce braking distances.[40] Examination of the aircraft's maintenance logs showed that the thrust reverser on the right-side engine had been deactivated pending repair. It had been wired shut, and tape placed over the cockpit control to alert the crew. The MD-82 is permitted to fly with just one operable thrust reverser.[38][41]

Flaps and slats

El Mundo, citing a source in the investigation team, reported that the cockpit voice recorder showed that the pilot had said "Flaps OK, Slats OK" to the co-pilot.[42] The article confirmed that the flaps had not been extended and that the alarm for that condition had not sounded.[43] The final report concluded that the failure to deploy flaps was the cause of the accident. The warning signal that the flaps were not set failed to sound for unknown reasons.

The maintenance logbook of the airplane has comments, 2 days before the crash, for an "autoslats failure" visual alarm occurring on slats extension; however autoslats are not used on takeoff, and it cannot be inferred that the slats system had a defect.[44]

Flight mode

In an article published on 7 September, El Mundo suggested that during the flight preparation and takeoff attempts, the aircraft had some of its systems in flight mode rather than ground mode.[45] If true, this might explain why de-icing of the Total Air Temperature probe activated on the ground, causing overheating, since in flight the heater would activate only when there was no air flow in the probe, a sign of icing. This might also explain why the flaps and slats alarm had not sounded, since this alarm is disabled in flight mode.[45][46]

James W. Hudspeth, an investigator of a previous near accident (an MD-83, starting from Lanzarote) that was similar in its details, pointed out that the fuse of the so-called "left ground control relay" at position K-33 of the control panel might have been the actual culprit in the erroneous flight mode: Hudspeth found out during a 2-week investigation at Lanzarote that it is customary in normal maintenance routine to temporarily remove this fuse to engage flight mode, but the fuse is afterwards sometimes not replaced correctly. Because of the frequent handling of this fuse, it is also not easy to visually check that the fuse is functioning properly (as is customary for the pilots to do when they enter the cockpit). Hudspeth speculates that this may have happened with both JK 5022 and Northwest Airlines Flight 255.[47]

Malware

Spanish daily El Pais reported that, as revealed in an internal report issued by Spanair, malware which had infected their central computer system used to monitor technical problems with their aircraft may have resulted in a failure to raise an alarm over multiple problems with the plane. A judge ordered the airline to provide all the computer's logs from the days before and after the crash.[48][49][50]

Final report

The CIAIAC published its final report into the accident on 26 July 2011.[12]

It determined that the cause of the accident was:

The CIAIAC determined the following contributory factors:

Similar accidents

CIAIAC's interim report specifically mentioned three other fatal accidents caused by the failure to deploy flaps and slats prior to take-off: Northwest Airlines Flight 255, which also involved an MD-82, Delta Air Lines Flight 1141, and Mandala Airlines Flight 091.[51]

In the case of Northwest Airlines Flight 255, also an MD-82, the crew had similarly been disrupted from routine operation before the fatal takeoff, and the alarm similarly had not sounded. In that accident, the reason for the lack of TOWS alarm was a tripped (or pulled) circuit breaker. However, examination of the alarm and its circuit breaker in Spanair 5022 had not revealed any fault.[52][53]

Other accidents caused by taking off without deploying flaps and slats correctly include Lufthansa Flight 540 and LAPA Flight 3142.

See also

List of accidents and incidents involving commercial aircraft

Notes

  1. ↑ The basic shape of all aircraft wings is designed for optimum speed and fuel-efficiency during cruise flight (at around 500mph/430 knots IAS [indicated airspeed] in the MD-82). At lower speeds, such as those associated with take-offs and landings (typically 160mph), the lift generated by the wings is much less than at cruise speed – or would be were it not for the use of high-lift devices such as flaps and slats. For low-speed flight, the pilot alters the shape of the wing by deploying the flaps and slats. For take-off, this is done during the pre-takeoff checks, before entering the runway; on the MD-82, flaps and slats are controlled by a single lever on the cockpit's central console. The flaps are located at the trailing edge of the wings and, when deployed, extend backward and downward from the wing. The slats extend forward from the leading edge of the wing.[14] The effect of both flaps and slats is to increase the surface area and "camber" of the wing, thereby increasing the amount of lift produced. See flaps and slats for more information.
  2. ↑ The aircraft's computer uses total air temperature to help calculate the ambient air temperature, which in turn is needed to calculate the aircraft's true airspeed. True airspeed is needed for high altitude navigation, but is not so important for maintaining stable flight. Ground Speed is calculated directly from GPS position change (or Inertial navigation position change on earlier models). When TAS (true airspeed) is compared with Groundspeed, however, the actual wind direction and speed at that altitude can be calculated and presented to the pilot. Indicated airspeed, a measure of the relative wind over the aircraft's surfaces, is a more important measure for ensuring stable, safe flight. The aircraft's stall speed closely relates to indicated airspeed, for example.

References

  1. 1 2 "Spanish plane that crashed had overheated valve". Associated Press. 21 August 2008. Archived from the original on 2 September 2008.
  2. ↑ "Madrid crash claims another life". BBC. 23 August 2008. Retrieved 25 August 2008.
  3. ↑ Santafe, Elisa (22 August 2006). "Families struggle to face up to losses in Spain air disaster". Brisbane Times. Retrieved 22 August 2008.
  4. ↑ Flottau, Jens (30 January 2012). "Spanair Shuts Down; Future Uncertain". Aviation Week. Aviation Daily. Retrieved 30 December 2014.
  5. ↑ "Spanish airline Spanair ceases operations after running out of funds". Washington Post. Associated Press. 27 January 2012. Retrieved 27 January 2012.
  6. 1 2 Simon Hradecky (16 September 2008). "Crash: Spanair MD-82 at Madrid on 20 August 2008, went off runway during takeoff".
  7. ↑ "Picture of the McDonnell Douglas MD-82 (DC-9-82) aircraft". Airliners.net. Retrieved 22 August 2008.
  8. ↑ CIAIAC final report, section 1.6.1, page 16
  9. ↑ Spanair Press release Spanair Press release Retrieved 16:42 GMT 20 August 2008 Archived 23 August 2008 at the Wayback Machine.
  10. 1 2 3 CIAIAC final report, section 1.2 (page 6, PDF page 26 of 284)
  11. 1 2 CIAIAC final report, Synopsis, (page xvii, PDF page 19 of 284)
  12. 1 2 "Final Report A-032/2008" (PDF). CIAIAC. 29 July 2011. Retrieved 27 March 2015.
  13. ↑ "¿A qué hora ocurrió exactamente el accidente?". El Mundo. Retrieved 22 August 2008.
  14. ↑ CIAIAC final report, section 1.6.2.1, pages 17–23 (PDF pages 37–43 of 284)
  15. ↑ "What caused the Madrid crash?". BBC. 21 August 2008. Retrieved 4 January 2010.
  16. ↑ Final report, section 1.12
  17. ↑ Keeley, Graham (20 August 2008). "Madrid crash: 'The plane came to a sharp stop. I heard a horrible noise'". The Guardian (UK). Retrieved 23 May 2010.
  18. 1 2 "Many dead in Madrid plane crash". BBC News. 20 August 2008. Retrieved 4 January 2010.
  19. ↑ Brothers, Caroline; Maynard, Micheline (20 August 2008). "More Than 150 Die in Madrid Plane Crash". The New York Times. Retrieved 23 May 2010.
  20. ↑ "147 killed in plane crash at Madrid airport". Associated Press. 20 August 2008. Archived from the original on 23 August 2008.
  21. ↑ "Death toll climbs in Spanair plane crash". UPI. 20 August 2008.
  22. ↑ Worden, Tom; Couzens, Gerard (21 August 2008). "'Scene from Hell': More than 150 tourists burned alive as plane was ripped apart in runway fireball". Daily Mail (UK).
  23. ↑ "153 killed in Madrid airport plane crash". Reuters. 20 August 2008. Retrieved 22 August 2008.
  24. ↑ "British woman's incredible escape from doomed Madrid plane". Mirror Group Newspapers. 24 August 2008. Archived from the original on 11 March 2009.
  25. ↑ "20-08-2008. EC-HFP. McDonnell Douglas MD-82. Aeropuerto de Barajas (Madrid). Preliminary report" (PDF). CIAIAC. 14 October 2008. Archived from the original (PDF) on 13 June 2010. (Spanish version)
  26. ↑ "20-08-2008. EC-HFP. McDonnell Douglas MD-82. Aeropuerto de Barajas (Madrid). Interim report" (PDF). CIAIAC. 17 August 2009. Archived from the original (PDF) on 29 December 2009. (Spanish version; press release)
  27. ↑ "El informe de la tragedia de Spanair revela dos errores de los pilotos y un fallo técnico (Spanish)". El País. 17 August 2009.
  28. ↑ "Progress Note A-032/2008" (PDF). CIAIAC. (Spanish version)
  29. 1 2 Keeley, Graham (22 August 2008). "Madrid air disaster video shows new light on cause of crash". The Guardian (UK). Retrieved 22 August 2008.
  30. ↑ "Madrid plane burst into flames after runway skid". CNN. 22 August 2008. Retrieved 24 August 2008.
  31. ↑ "'Chain of faults' in Madrid crash". BBC. 22 August 2008. Retrieved 22 August 2008.
  32. ↑ Flottau, Jens (22 August 2008). "Spanair Continues MD-80 Services As Madrid Investigation Begins". Aviation Week. Retrieved 23 August 2008.
  33. ↑ "Spanish mechanic who cleared doomed plane quizzed". Associated Press. 23 August 2008. Archived from the original on 10 February 2010.
  34. ↑ Elven, Tree; Percept, Adeline (1 September 2008). "Speculation over causes of Spanair crash". France 24. Archived from the original on 3 September 2008.
  35. ↑ Govan, Fiona (11 May 2010). "Last moments of doomed Spanair flight caught on tape". London: The Telegraph. Retrieved 24 August 2010.
  36. ↑ "Spanair mechanics face crash quizz". BBC. 16 October 2008. Retrieved 4 January 2010.
  37. 1 2 "Los motores están enteros y sin signos de haber sufrido incendio, según la investigación". ElMundo.es. 26 August 2008. Retrieved 26 August 2008.
  38. 1 2 Final report, section 1.12.7 "Wreckage and impact information: Engines
  39. ↑ Hernández, José Antonio (25 August 2008). "La pérdida de potencia de los motores centra las pesquisas". El País. Retrieved 25 August 2008.
  40. ↑ "Triebwerk im Spanair-Jet war auf Umkehrschub geschaltet". Der Spiegel (in German). 26 August 2008. Retrieved 26 August 2008.
  41. ↑ Govan, Fiona (28 August 2008). "Spanish crash plane had known mechanical problem". Daily Telegraph (UK). Retrieved 29 August 2008.
  42. ↑ "Los alerones del avión estrellado en Madrid no estaban activados" (in Spanish). Google News. AFP. 6 September 2008. Archived from the original on 8 September 2008.
  43. ↑ Bremner, Charles (6 September 2008). "Basic pilot error blamed for Spanair crash in Madrid that killed 154". The Times (UK). Archived from the original on 6 September 2008. Retrieved 23 May 2010.
  44. ↑ H. B. (15 September 2008). "More faults revealed about fated Spanair plane". Typically Spanish. Archived from the original on 16 September 2008.
  45. 1 2 "Las claves de la investigación del accidente del JK 5022 en Barajas". El Mundo (in Spanish). 7 September 2008.
  46. ↑ "Spanair MD-82 crash inquiry battles to understand absent flap warning". Flight International. 16 September 2008.
  47. ↑ Méndez, Rafael (5 October 2008). "Avisé a España que podía pasar lo del MD y no hicieron nada". El País (in Spanish).
  48. ↑ Leyden, John (20 August 2010). "Trojan-ridden warning system implicated in Spanair crash". The Register.
  49. ↑ Hernández, José Antonio (20 August 2010). "El ordenador de Spanair que anotaba los fallos en los aviones tenía virus". El País (in Spanish).
  50. ↑ "Malware implicated in fatal Spanair plane crash". TechNewsDaily. 20 August 2010.
  51. ↑ "Interim Report A-032/1998" (PDF). CIAIAC. p. 34. Archived from the original (PDF) on 29 December 2009.
  52. ↑ Eddy, Paul (24 August 2008). "Spanair crash recalls 1987 Detroit disaster". The Times (UK). Retrieved 23 May 2010.
  53. ↑ "Aircraft Accident Report, Northwest Airlines 255" (PDF). NTSB. 16 August 1987.

External links

Wikimedia Commons has media related to Spanair Flight JK 5022.

Spanair

El País

Guardia Civil

Civil Aviation Accident and Incident Investigation Commission

This article is issued from Wikipedia - version of the Saturday, May 07, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.