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Last updated: 26 July 2021
Statuts:Enquête Officielle
Date:samedi 13 août 1994
Heure:13:31
Type/Sous-type:Silhouette image of generic C130 model; specific model in this crash may look slightly different
Lockheed C-130A Hercules
Compagnie:Hemet Valley Flying Service
Immatriculation: N135FF
Numéro de série: 3148
Année de Fabrication: 1957
Heures de vol:20300
Moteurs: 4 Allison T56-A-9D
Equipage:victimes: 3 / à bord: 3
Passagers:victimes: 0 / à bord: 0
Total:victimes: 3 / à bord: 3
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:ca 11 km S of Pearblossom, CA (   Etats-Unis d'Amérique)
Phase de vol: En cours de manoeuvre (MNV)
Nature:Incendie
Aéroport de départ:Hemet-Ryan Field, CA (HMT/KHMT), Etats-Unis d'Amérique
Aéroport de destination:Hemet-Ryan Field, CA (HMT/KHMT), Etats-Unis d'Amérique
Détails:
The Hercules was on its way to a forest fire in the Tehachipi Mountains when it lost control and crashed on the north face of Pleasant View Ridge in the vicinity of Pechner Canyon at about the 6,500 foot level. The right wing (including no. 3 and no. 4 engine) had failed in-flight following a fuel tank explosion. The aircraft in question had been in storage for 2 years and had a history of fuel leaks in the dry bay area. The source of which usually being flattened or pinched O-rings which are on-condition replacement items. Inspection for leaks in this area are required before flight. The dry bay area of the right wing contains high pressure fuel lines, unshielded and exposed electrical wiring and is in close proximity to the no. 3 engine. This initially led to the following probable cause: "the ignition of fuel leaking from the pressurized fuel system lines in or adjacent to the No. 3 dry bay, most likely due to electrical arcing and/or hot surfaces in the No. 3 engine."
Following two air tanker accidents in 2002 the NTSB reviewed the accident information, including the examination of wreckage that was not recovered in the initial investigation. This revealed previously undiscovered evidence of fatigue fracturing in right-side, center-wing fragments that supported revising the probable cause.

Probable Cause:

PROBABLE CAUSE: "The inflight failure of the right wing due to fatigue cracking in the underside right wing skin and overlying doubler. A factor contributing to the accident was inadequate maintenance procedures to detect fatigue cracking."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 4 months
Accident number: LAX94FA323
Download report: Summary report

Sources:
» ICAO Adrep Summary 6/95 (#37)
» NTSB id. LAX94FA323
» Scramble 187


Opérations de secours

NTSB issued 5 Safety Recommendations

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Photos

photo of Lockheed-C-130A-Hercules-N135FF
accident date: 13-08-1994
type: Lockheed C-130A Hercules
registration: N135FF
 

Plan

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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