Accident
Last updated: 24 October 2014
Status:Definitief
Datum:zaterdag 13 augustus 1994
Tijd:13:31
Type:Lockheed C-130A Hercules
Luchtvaartmaatschappij:Hemet Valley Flying Service
Registratie: N135FF
Constructienummer: 3148
Bouwjaar: 1957
Aantal vlieguren:20300
Motoren: 4 Allison T56-A-9D
Bemanning:slachtoffers: 3 / inzittenden: 3
Passagiers:slachtoffers: 0 / inzittenden: 0
Totaal:slachtoffers: 3 / inzittenden: 3
Schade: Vernield
Gevolgen: Written off (damaged beyond repair)
Plaats:nabij Pearblossom, CA (   Verenigde Staten)
Fase: Manoeuvreren (MNV)
Soort vlucht:Brandblusvlucht
Vliegveld van vertrek:Hemet-Ryan Field, CA (HMT), Verenigde Staten
Vliegveld van aankomst:Hemet-Ryan Field, CA (HMT), Verenigde Staten
Beschrijving:
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: "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."

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


Veiligheidsmaatregelen

NTSB issued 5 Safety Recommendations

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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 Hemet-Ryan Field, CA en Hemet-Ryan Field, CA bedraagt 0 km (0 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Networkĺs 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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