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Last updated: 18 February 2019
Status:Definitief
Datum:maandag 25 november 2013
Tijd:10:21
Type:Silhouette image of generic DC6 model; specific model in this crash may look slightly different
Douglas C-118A Liftmaster (DC-6A)
Luchtvaartmaatschappij:Everts Air Cargo
Registratie: N100CE
Constructienummer: 44662/629
Bouwjaar: 1955
Motoren: 4 Pratt & Whitney R-2800
Bemanning:slachtoffers: 0 / inzittenden: 3
Passagiers:slachtoffers: 0 / inzittenden: 0
Totaal:slachtoffers: 0 / inzittenden: 3
Schade: Groot
Gevolgen: Repaired
Plaats:Nuiqsut, AK (   Verenigde Staten)
Fase: Kruisvlucht (ENR)
Soort vlucht:Vracht
Vliegveld van vertrek:Deadhorse-Alpine Airstrip, AK (DQH/PALP), Verenigde Staten
Vliegveld van aankomst:Nuiqsut Airport, AK (NUI/PAQT), Verenigde Staten
Beschrijving:
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:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 149 days (5 months)
Accident number: ANC14CA012
Download report: Summary report

Bronnen:
» NTSB


Foto's

photo of Douglas C-118A Liftmaster (DC-6A) N100CE
Being refurbished for a career in Alaska after years in the Arizona desert.
Add your photo of this accident or aircraft
 

Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Deadhorse-Alpine Airstrip, AK en Nuiqsut Airport, AK bedraagt 15 km (9 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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