
Détails:
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: "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."
» Flightaware
flight route
| Statuts: | Accident investigation report completed and information captured |
| Date: | vendredi 12 février 2016 |
| Heure: | 07:00 |
| Type/Sous-type: |  Lockheed L-100-30 Hercules |
| Compagnie: | Lynden Air Cargo |
| Immatriculation: | N401LC |
| Numéro de série: | 4606 |
| Année de Fabrication: | 1975 |
| Heures de vol: | 55393 |
| Cycles: | 35421 |
| Moteurs: | 4 Allison 501-D22A |
| Equipage: | victimes: 0 / Ã bord: 5 |
| Passagers: | victimes: 0 / Ã bord: 0 |
| Total: | victimes: 0 / Ã bord: 5 |
| Dégats de l'appareil: | Substantiels |
| Conséquences: | Repaired |
| Lieu de l'accident: | près de Iliamna, AK ( Etats-Unis d'Amérique)
|
| Phase de vol: | En vol (ENR) |
| Nature: | Cargo |
| Aéroport de départ: | Bethel Airport, AK (BET/PABE), Etats-Unis d'Amérique |
| Anchorage-Elmendorf AFB, AK (EDF/PAED), Etats-Unis d'Amérique | |
| Numéro de vol: | LYC401 |
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."
Sources:
» NTSB» Flightaware
Opérations de secours
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.
Photos
flight route
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 Bethel Airport, AK et Anchorage-Elmendorf AFB, AK est de 645 km (403 miles).
La distance entre Bethel Airport, AK et Anchorage-Elmendorf AFB, AK est de 645 km (403 miles).
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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