Trans-Air Service Flight 671

Last updated
Trans-Air Service Flight 671
Boeing 707-321C, Kabo Air Cargo AN0017344.jpg
5N-MAS, the aircraft involved in the accident, taken 3 days prior
Accident
DateMarch 31, 1992 (1992-03-31)
SummaryIn-flight separation of two engines due to metal fatigue
Site Séderon, Drôme, Auvergne-Rhône-Alpes, France
Aircraft
Aircraft type Boeing 707-321C
Operator Trans-Air Service for Kabo Air
IATA flight No.N9671
ICAO flight No.QNK671
Call signKABO 671
Registration 5N-MAS
Flight origin Luxembourg Airport
Destination Mallam Aminu Kano International Airport
Occupants5
Crew5
Fatalities0
Injuries0
Survivors5

Trans-Air Service Flight 671 was a cargo flight from Luxembourg Airport to Mallam Aminu Kano International Airport in Kano, Nigeria. While flying over France on March 31, 1992, the Boeing 707 operating the flight experienced an in-flight separation of two engines on its right wing. Despite the damage to the aircraft, the pilots were able to perform an emergency landing at Istres-Le Tubé Air Base in Istres, France. All five occupants of the aircraft survived; however, the aircraft was damaged beyond repair due to a fire on the right wing.

Contents

Aircraft and crew

Aircraft

The aircraft was a 28-year-old Boeing 707-321C, serial number 18718. It had been manufactured in April 1964 and was first delivered to Pan Am at end of the month. It had accumulated 60,985 flight hours over 17,907 flights. It was powered by four Pratt & Whitney JT3D-3B engines. During its history, the aircraft's owner and registration had changed multiple times; at the time of the accident, it was registered 5N-MAS and operated for Nigerian operator Trans-Air Service. [1]

Crew

The captain was 57-year-old Swedish national Ingemar Berglund; he had a total of approximately 26,000 hours of flying experience, including 7,100 on the Boeing 707. The first officer was 44-year-old British national Martin Emery; he had approximately 14,000 hours of flying experience, including 4,500 on the Boeing 707. The flight engineer was 55-year-old British national Terry Boone; he had approximately 18,000 hours of flying experience, all on the Boeing 707. A mechanic and a cargo supervisor were also on board the flight. [1] [2] [3] The mechanic was 36-year-old Nigerian national Ike Nwabudike, and the cargo supervisor was 27-year-old Icelandic national Ingvar Einarsson.

Crew by nationality
NationalityCrew
Sweden1
United Kingdom2
Nigeria1
Iceland1
Total5

Accident

The flight departed Luxembourg Airport at 07:14 UTC (9:14 am local time) on March 31, 1992; it was carrying 38 tonnes of freight and was destined for Mallam Aminu Kano International Airport near Kano, Nigeria. At approximately 08:11, while the aircraft was climbing through 32,000 feet (9,800 m) over the Drôme department in southeastern France, the crew noticed severe turbulence and heard a loud "double bang"; the aircraft subsequently began to roll to the right. Captain Berglund then disengaged the autopilot and used control column and rudder inputs to regain control of the aircraft. In addition, the fire warning was continuously audible and could not be switched off by the flight engineer. First Officer Emery subsequently observed that the number 4 engine (the right-most of the aircraft's four engines) had detached from the wing and sent out a mayday call. Emery subsequently noticed that the number 3 engine (the inner engine on the right wing) had also detached from the wing. Captain Berglund subsequently started descending towards Marseille while Flight Engineer Boone began dumping fuel in preparation for an emergency landing. [1] [4]

During the descent, the crew noticed an airfield ahead; this was Istres-Le Tubé Air Base in Istres, France. The crew subsequently decided to land on runway 15 at Istres; this required a left hand circuit prior to landing. This left turn proved to be very challenging for Captain Berglund given the damage to the aircraft's flight controls; the cockpit voice recorder showed that First Officer Emery was encouraging Berglund by repeating the words "left turn" six times. Shortly before landing, the air traffic controller observed a fire on the aircraft. [1] [4]

The aircraft made an emergency landing at Istres at 08:35 (10:35 am local time), approximately 24 minutes after the initial engine separation. During the landing roll, the aircraft ran off the left side of the runway. After the aircraft came to a stop, the crew noticed that there was a fire on the aircraft's right wing. All five occupants of the aircraft survived without any injuries; however, there was considerable fire damage to the right wing. The aircraft was damaged beyond repair. [1] [4]

Investigation

Engines Number 3 and 4 were located near Séderon, Drôme. [5] Investigators found that metal fatigue had caused a crack to develop in the pylon that held the number 3 engine (the right inboard engine) to the wing. This weakened the pylon such that it broke on the accident flight, leading to separation of the number 3 engine. As it detached from the wing, the separated number 3 engine struck the number 4 engine, causing it to separate as well. In addition, an airworthiness directive that required periodic inspections of the pylons was found to be ineffective in detecting such fatigue cracks. [1] [4]

Aftermath

In response to the accident, the French BEA (Bureau of Enquiry and Analysis for Civil Aviation Safety) recommended modification to the inspection procedures for engine pylons so that fatigue cracks could be detected more easily. The BEA also recommended that air traffic controllers receive regular training for emergency situations by theoretical study and by performing practical exercises. [1]

The year after the incident, the crew received the Hugh Gordon-Burge Memorial Award from the Honourable Company of Air Pilots. [2] [3]

Trans-Air Service Flight 671 was featured on season 22 of the Canadian documentary series Mayday , in the episode titled "Double Trouble". [6]

See also

Other incidents involving engine or propeller separation:

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References

  1. 1 2 3 4 5 6 7 "RAPPORT relatif à l'accident survenu le 31 mars 1992 au Boeing 707 immatriculé 5N-MAS (Nigéria) exploité par la Compagnie Trans-Air Limited" [REPORT relating to the accident on March 31, 1992 to the Boeing 707 registered 5N-MAS (Nigeria) operated by the Compagnie Trans-Air Limited] (in French). Bureau of Enquiry and Analysis for Civil Aviation Safety. Archived from the original on 12 October 2021. Retrieved 26 June 2021. - PDF version
  2. 1 2 ""Nous avons perdu les deux moteurs droits !"" [We have lost the two right engines!] (in French). Archived from the original on 11 January 2005. Retrieved 26 June 2021.
  3. 1 2 "The Hugh Gordon-Burge Memorial Award". Honourable Company of Air Pilots. Archived from the original on 13 November 2021. Retrieved 27 June 2021.
  4. 1 2 3 4 Ranter, Harro. "ASN Aircraft accident Boeing 707-321C 5N-MAS Istres". aviation-safety.net. Aviation Safety Network. Archived from the original on 11 December 2017. Retrieved 26 June 2021.
  5. ↑ "RAPPORT relatif à l'accident survenu le 31 mars 1992 au Boeing 707 immatriculé 5N-MAS (Nigéria) exploité par la Compagnie Trans-Air Limited". Bureau d'Enquêtes et d'Analyses.
  6. ↑ "Trans-Air Service Flight 671 on IMDb". IMDb. Archived from the original on 2021-12-25. Retrieved 2022-01-25.

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