
Détails:
The Swearingen SA226-AT Merlin IV, HK-5225, belonging to the company Colcharter, was scheduled to perform two flights as an air ambulance, first from Barranquilla to San Andres (ADZ) and then with a patient to Medellin (EOH). The first leg was uneventful.
The controller cleared the flight to back track on runway 06/24 to the threshold of runway 06 for takeoff.
After having taxied about 200 m, the right engine apparently experienced a substantial periodic acceleration to a taxi speed of 36 knots, where a maximum speed of 10 knots is allowed by the manufacturer. After the right engine accelerated, there was a trajectory change to the left side of the runway centerline. The crew attempted to keep the aircraft within the runway, however, the crew's efforts did not have a positive result, allowing the aircraft to drift out of the runway into the safety zone. When the aircraft was over the safety zone, the crew attempted to use the braking system, however, the brakes were not effective due to the poor traction of the aircraft's wheels with the grass surface in the safety zone.
The aircraft continued to taxi to the left of the runway, until coming to a complete stop when the nose of the aircraft collided with a concrete wall bordering the airport.
The aircraft suffered substantial damage in the nose area, however, the stress concentration due to the impact was more evident in the left front fuselage area, structurally compromising a large part of the skin.
Probable Cause
Runway excursion, as a result of loss of directional control of the aircraft, when exceeding the maximum taxi speed allowed by the aircraft manufacturer.
Contributing Factors
Possible misuse of the nose wheel steering control system, nose wheel steering, by the crew when using it above the allowed speed, hindering directional control.
Lack of standardization of the company's operating procedures, as it lacks its own taxiing policies and procedures.
Probable self-imposed pressure from the crew, due to their desire to comply with the scheduled operation.
Overconfidence, complacency, loss of situational awareness, and inadequate application of CRM by the crew, during a normal operation of the aircraft, which was apparently free of hazards.
| Statuts: | Accident investigation report completed and information captured |
| Date: | mercredi 16 février 2022 |
| Heure: | 15:13 |
| Type/Sous-type: |  Swearingen SA226-AT Merlin IV |
| Compagnie: | Colcharter |
| Immatriculation: | HK-5225 |
| Numéro de série: | AT-027 |
| Année de Fabrication: | 1974 |
| Moteurs: | 2 Garrett TPE331-10UA-511G |
| Equipage: | victimes: 0 / Ã bord: 2 |
| Passagers: | victimes: 0 / Ã bord: 3 |
| Total: | victimes: 0 / Ã bord: 5 |
| Dégats de l'appareil: | Substantiels |
| Lieu de l'accident: | San Andres Island-Gustavo Rojas Pinilla Airport (ADZ) ( Colombie)
|
| Phase de vol: | Au roulage (TXI) |
| Nature: | Ambulance |
| Aéroport de départ: | San Andres Island-Gustavo Rojas Pinilla Airport (ADZ/SKSP), Colombie |
| MedellÃn-Enrique Olaya Herrera Airport (EOH/SKMD), Colombie |
The Swearingen SA226-AT Merlin IV, HK-5225, belonging to the company Colcharter, was scheduled to perform two flights as an air ambulance, first from Barranquilla to San Andres (ADZ) and then with a patient to Medellin (EOH). The first leg was uneventful.
The controller cleared the flight to back track on runway 06/24 to the threshold of runway 06 for takeoff.
After having taxied about 200 m, the right engine apparently experienced a substantial periodic acceleration to a taxi speed of 36 knots, where a maximum speed of 10 knots is allowed by the manufacturer. After the right engine accelerated, there was a trajectory change to the left side of the runway centerline. The crew attempted to keep the aircraft within the runway, however, the crew's efforts did not have a positive result, allowing the aircraft to drift out of the runway into the safety zone. When the aircraft was over the safety zone, the crew attempted to use the braking system, however, the brakes were not effective due to the poor traction of the aircraft's wheels with the grass surface in the safety zone.
The aircraft continued to taxi to the left of the runway, until coming to a complete stop when the nose of the aircraft collided with a concrete wall bordering the airport.
The aircraft suffered substantial damage in the nose area, however, the stress concentration due to the impact was more evident in the left front fuselage area, structurally compromising a large part of the skin.
Probable Cause:
Probable Cause
Runway excursion, as a result of loss of directional control of the aircraft, when exceeding the maximum taxi speed allowed by the aircraft manufacturer.
Contributing Factors
Possible misuse of the nose wheel steering control system, nose wheel steering, by the crew when using it above the allowed speed, hindering directional control.
Lack of standardization of the company's operating procedures, as it lacks its own taxiing policies and procedures.
Probable self-imposed pressure from the crew, due to their desire to comply with the scheduled operation.
Overconfidence, complacency, loss of situational awareness, and inadequate application of CRM by the crew, during a normal operation of the aircraft, which was apparently free of hazards.
Accident investigation:

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Sources:
» AerocivilOpérations de secours
Aerocivil issued 3 Safety Recommendations
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Photos
Video, social media
#InformaciónImportante | Aeronave tipo MerlÃn SW4, de matrÃcula HK 5225, ambulancia, que se encontraba rodando en la pista de San Andrés Islas con destino a MedellÃn, se salió de la pista antes del despegue, cruzando la zona de seguridad, e impactando, contra el muro perimetral. pic.twitter.com/cpBB4IqcGb
— Aeronáutica Civil de Colombia (@AerocivilCol) February 16, 2022
Poco a poco se han ido reestableciendo las operaciones en el aeropuerto de San Andrés tras permanecer suspendidas durante una hora mientras se atendÃa el percance de la aeronave tipo avión ambulancia de Colcharter, de matricula HK5225 que transportaba un paciente. pic.twitter.com/XSHBQEidhb
— The Archipielago Press (@thearchipielago) February 16, 2022
Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre San Andres Island-Gustavo Rojas Pinilla Airport et MedellÃn-Enrique Olaya Herrera Airport est de 970 km (606 miles).
Accident location: Exact; as reported in the official accident report.
La distance entre San Andres Island-Gustavo Rojas Pinilla Airport et MedellÃn-Enrique Olaya Herrera Airport est de 970 km (606 miles).
Accident location: Exact; as reported in the official accident report.
Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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