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ASN Wikibase Occurrence # 232104
Last updated: 3 May 2021
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Type:Silhouette image of generic B407 model; specific model in this crash may look slightly different
Bell 407
Owner/operator:Corporación Nacional Forestal de Chile (CONAF), lsd Ba
Registration: CC-AEC
MSN: 53599
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Location:Lautaro, Araucanía Region -   Chile
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Fire fighting
Departure airport:
Destination airport:
Investigating agency: DGAC Chile
The helicopter sustained substantial damage after it hit the ground during forced landing when the engine failed during a fire fighting mission. The sole pilot onboard is in good condition.

Impact of the main rotor blades against the tail cone, during ground contact, due to an autorotation manoeuvre caused by engine stall in flight, due to an internal failure of the power turbine position detector fuse.
1. Stretch-cutting of two wires of the frangible fuse electrical harness.
2. Thermal mismatch fracture of the epoxy resin inside the frangible fuse elbow.
3. Erroneous signal from the ECU, which caused the fuel flow to be cut off and consequently the engine to stop in flight at low altitude.
4. Failure to release the Bambi Bucket, which was loaded with water, during the autorotation manoeuvre, which increased the descent and speed during the emergency landing.
5. Bringing the cyclic backwards, during contact with the ground, in order to counteract the forward movement of the aircraft, impacting the main rotor blades against the tail cone, fracturing it.

Sources: (photo)

Accident investigation:
Investigating agency: DGAC Chile
Status: Investigation completed
Duration: 1 year and 2 months
Download report: Final report

Revision history:

13-Jan-2020 22:14 Captain Adam Added
14-Jan-2020 01:53 RobertMB Updated [Aircraft type, Operator, Source]
14-Jan-2020 17:56 RobertMB Updated [Registration, Cn, Source]
18-Feb-2021 20:38 harro Updated [Operator, Source, Narrative]
18-Mar-2021 20:31 harro Updated [Time, Narrative, Category, Accident report]
03-May-2021 11:56 harro Updated [[Time, Narrative, Category, Accident report]]
03-May-2021 12:03 harro Updated [[[Time, Narrative, Category, Accident report]]]
03-May-2021 12:04 harro Updated [[[[Time, Narrative, Category, Accident report]]]]

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