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Statuts:Enquête Officielle
Date:vendredi 2 octobre 1970
Heure:13:00 MDT
Type/Sous-type:Silhouette image of generic M404 model; specific model in this crash may look slightly different
Martin 4-0-4
Compagnie:Golden Eagle Aviation
Immatriculation: N464M
Numéro de série: 14151
Année de Fabrication: 1952
Equipage:victimes: 2 / à bord: 3
Passagers:victimes: 30 / à bord: 37
Total:victimes: 32 / à bord: 40
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:17 km (10.6 milles) W of Silver Plume, CO (   Etats-Unis d'Amérique)
Phase de vol: En vol (ENR)
Nature:Charter National
Aéroport de départ:Denver-Stapleton International Airport, CO (DEN/KDEN), Etats-Unis d'Amérique
Aéroport de destination:Logan-Cache Airport, UT (LGU/KLGU), Etats-Unis d'Amérique
Détails:
Two Martin 4-0-4 planes were charted from the Jack Richards Aircraft Company to fly the Wichita State University football team to Logan. Both aircraft were piloted by flight crew from Golden Eagle Aviation. The first officer for N464M was the president of Golden Eagle Aviation. After a ferry flight from Oklahoma City the passengers boarded the planes at Wichita. Both aircraft proceeded toward Denver for a planned refueling stop. En route to Denver, the first officer of N464M, while visiting with passengers in the cabin, advised some of them that the flight would take the "scenic route" from Denver to Logan and that he would point out the ski resorts and significant points of interest. On arrival at Denver at approximately 11:19, both aircraft were serviced with fuel and oil. The First Officer of N464M then purchased aeronautical sectional charts for the contemplated scenic route. The other Martin, N470M, took off from Denver and proceeded to Logan according to the original flight plan. N464M, with the first officer acting as pilot flying in the left hand seat, departed from runway 35 at 12:29. Enroute to Logan, the flight turned slightly south, off the airway, to go through a pass in order to follow a valley. After intercepting Clear Creek Valley, the flight proceeded along US Highway 6, slightly south of it, past Georgetown and Silver Plume, toward Loveland Pass. The elevation at Georgetown is 8,512 msl and at Silver Plume is 9,118 feet msl. Thereafter, the valley floor continues to rise, reaching an elevation of 11,990 feet msl at Loveland Pass.
In the vicinity of Dry Gulch the first officer noticed that they would probably not be able to clear the Continental Divide ahead. He then initiated a turn to right. After rolling out of the turn the captain took control and initiated a left turn during which the plane began to vibrate. The captain then put the nose down following which the plane struck trees at the 10,800-foot level on Mount Trelease (elevation 12,447 feet msl) in a 31-degree left bank and a 4-degree angle of descent and cut a 425 feet swath through the timber.

Probable Cause:

PROBABLE CAUSE: "The intentional operation of the aircraft over a mountain valley route at an altitude from which the aircraft could neither climb over the obstructing terrain ahead, nor execute a successful course reversal. Significant factors were the overloaded condition of the aircraft, the virtual absence of flight planning for the chosen route of flight from Denver to Logan, a lack of understanding on the part of the crew of the performance capabilities and limitations of the aircraft, and the lack of operational management to monitor and appropriately control the actions of the flightcrew."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 83 days (3 months)
Accident number: NTSB/AAR-71-04
Download report: Final report
Language: English

Sources:
» Aviation Week & Space Technology 12 October 1970 (23-24)


Opérations de secours

NTSB issued 1 Safety Recommendation

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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 Denver-Stapleton International Airport, CO et Logan-Cache Airport, UT est de 623 km (390 miles).
Accident location: Approximate; accuracy within a few kilometers.

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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Martin 4-0-4

  • 101 built
  • 14ème loss
  • 6ème accident fatal
  • le accident The le plus grave (à ce moment là)
  • le accident The le plus grave (en ce moment)
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