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Last updated: 23 January 2022
Estado:Final
Fecha:viernes 12 febrero 2016
Hora:ca 07:00
Tipo:Silhouette image of generic C130 model; specific model in this crash may look slightly different
Lockheed L-100-30 Hercules
Operador:Lynden Air Cargo
Registración: N401LC
Numéro de série: 4606
Año de Construcción: 1975
Horas Totales de la Célula:55393
Ciclos:35421
Motores: 4 Allison 501-D22A
Tripulación:Fatalidades: 0 / Ocupantes: 5
Pasajeros:Fatalidades: 0 / Ocupantes: 0
Total:Fatalidades: 0 / Ocupantes: 5
Daños en la Aeronave: Considerable
Consecuencias: Repaired
Ubicación:cerca Iliamna, AK (   Estados Unidos de América)
Fase: En ruta (ENR)
Naturaleza:Carga
Aeropuerto de Salida:Bethel Airport, AK (BET/PABE), Estados Unidos de América
Aeropuerto de Llegada:Anchorage-Elmendorf AFB, AK (EDF/PAED), Estados Unidos de América
Número de Vuelo:LYC401
Descripción:
A Lockheed L-100-30 Hercules transport plane, operated by Lynden Air Cargo, diverted to Iliamna Airport, Alaska following a rapid in-flight decompression.
The aircraft departed Bethel, Alaska at 06:50 hours local time on a flight to Elmendorf Air Force Base near Anchorage. The airplane climbed to the planned cruising altitude of FL250. At 07:11, upon reaching 24500 feet, there was an in-flight decompression. The flight crew initiated an emergency descent to FL120, which was reached at 07:16 hours. The flight then diverted to Iliamna were a safe landing was carried out at 08:05 hours.
Examination of the airplane revealed a large hole in the forward pressure bulkhead canted web.

The next day the aircraft was ferried to Anchorage and from there to Kelowna, BC, Canada at an altitude of 10000 feet.

Probable Cause:

PROBABLE CAUSE: "The fatigue failure of the forward pressure bulkhead canted web that originated from stress corrosion cracking areas. Contributing to the failure were inspection procedures and intervals inadequate to identify the crack."

Fuentes:
» NTSB
» Flightaware


Subsiguiente / acciones de seguridad
The manufacturer released a Service Bulletin based on the findings of the investigation to provide more detailed instructions and updated intervals to inspect for cracking of the forward pressure bulkhead canted web.

Fotos

photo of Lockheed-L-100-30-Hercules-N401LC
flight route
 

Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Bethel Airport, AK to Anchorage-Elmendorf AFB, AK as the crow flies is 645 km (403 miles).

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