Détails:
According to the operator, the purpose of the short, 22 minute flight from Alpine Airstrip was to deliver a load of oversized, oil drilling tools to a remote oil production site. The flightcrew reported that shortly after takeoff the first officer noticed that the airplane's elevator control movements appeared to be "momentarily stiff."
While en route to the destination, the flight engineer was asked to inspect the cargo, and he subsequently discovered that two of the four, 31-foot (9.45 m) long oil drilling tools had shifted aft, damaging the aft pressure bulkhead. The captain did not declare an emergency, and the airplane landed at the destination without incident.
A postflight inspection revealed substantial damage to the aft pressure bulkhead assembly, as well as various frames, stringers and structural longerons. In addition, several attachments for the elevator flight control pulleys and flight control cable guides were damaged. The operator noted that the airplane's pressurization system had been removed years ago, when the airplane was converted to a cargo configuration.
The operator reported that after loading the airplane, just before departure, the crew inspected the five nylon strapping mechanisms that secured the four drilling tools to the floor of the airplane. The crew reported that all five of the nylon straps were tight before departure, but gathered that one or more had loosened slightly during taxi and takeoff, allowing two of the tools to shift aft during takeoff. The crew also noted that the drilling tools were covered with ice and snow, which likely aided in the tools sliding along the aluminum, diamond plate-covered floor of the airplane.
PROBABLE CAUSE: "A load shift during takeoff, which resulted in substantial damage to the aft bulkhead and associated structures."
accident date: 25-11-2013
type: Douglas C-118A Liftmaster (DC-6A)
registration: N100CE
| Statuts: | Accident investigation report completed and information captured |
| Date: | lundi 25 novembre 2013 |
| Heure: | 10:21 |
| Type/Sous-type: |  Douglas C-118A Liftmaster (DC-6A) |
| Compagnie: | Everts Air Cargo |
| Immatriculation: | N100CE |
| Numéro de série: | 44662/629 |
| Année de Fabrication: | 1955 |
| Moteurs: | 4 Pratt & Whitney R-2800 |
| Equipage: | victimes: 0 / à bord: 3 |
| Passagers: | victimes: 0 / à bord: 0 |
| Total: | victimes: 0 / à bord: 3 |
| Dégats de l'appareil: | Substantiels |
| Conséquences: | Repaired |
| Lieu de l'accident: | Nuiqsut, AK ( Etats-Unis d'Amérique)
|
| Phase de vol: | En vol (ENR) |
| Nature: | Cargo |
| Aéroport de départ: | Deadhorse-Alpine Airstrip, AK (DQH/PALP), Etats-Unis d'Amérique |
| Nuiqsut Airport, AK (NUI/PAQT), Etats-Unis d'Amérique |
According to the operator, the purpose of the short, 22 minute flight from Alpine Airstrip was to deliver a load of oversized, oil drilling tools to a remote oil production site. The flightcrew reported that shortly after takeoff the first officer noticed that the airplane's elevator control movements appeared to be "momentarily stiff."
While en route to the destination, the flight engineer was asked to inspect the cargo, and he subsequently discovered that two of the four, 31-foot (9.45 m) long oil drilling tools had shifted aft, damaging the aft pressure bulkhead. The captain did not declare an emergency, and the airplane landed at the destination without incident.
A postflight inspection revealed substantial damage to the aft pressure bulkhead assembly, as well as various frames, stringers and structural longerons. In addition, several attachments for the elevator flight control pulleys and flight control cable guides were damaged. The operator noted that the airplane's pressurization system had been removed years ago, when the airplane was converted to a cargo configuration.
The operator reported that after loading the airplane, just before departure, the crew inspected the five nylon strapping mechanisms that secured the four drilling tools to the floor of the airplane. The crew reported that all five of the nylon straps were tight before departure, but gathered that one or more had loosened slightly during taxi and takeoff, allowing two of the tools to shift aft during takeoff. The crew also noted that the drilling tools were covered with ice and snow, which likely aided in the tools sliding along the aluminum, diamond plate-covered floor of the airplane.
Probable Cause:
PROBABLE CAUSE: "A load shift during takeoff, which resulted in substantial damage to the aft bulkhead and associated structures."
Accident investigation:
 |
|
Sources:
» NTSBPhotos
accident date: 25-11-2013
type: Douglas C-118A Liftmaster (DC-6A)
registration: N100CE
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 Deadhorse-Alpine Airstrip, AK et Nuiqsut Airport, AK est de 15 km (9 miles).
La distance entre Deadhorse-Alpine Airstrip, AK et Nuiqsut Airport, AK est de 15 km (9 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.
The Aviation Safety Network is an exclusive service provided by:
