ASN logo
ASN Wikibase Occurrence # 232104
Last updated: 3 May 2021
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information. If you feel this information is incomplete or incorrect, you can submit corrected information.

Date:13-JAN-2020
Time:14:10
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
Category:Accident
Location:Lautaro, Araucanía Region -   Chile
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Fire fighting
Departure airport:
Destination airport:
Investigating agency: DGAC Chile
Narrative:
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.


CAUSE
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.
CONTRIBUTING FACTORS
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:

https://www.24horas.cl/regiones/araucania/helicoptero-de-conaf-se-estrello-mientras-combatia-incendio-en-la-region-de-la-araucania-3853977
https://www.meganoticias.cl/nacional/288109-accidente-helicoptero-aterrizaje-emergencia-conaf-rayenco-lautaro-incendio.html?utm_source=notificacionesPush&utm_medium=breaking-news-aterrizaje-de
https://www.t13.cl/noticia/nacional/captan-momento-helicoptero-conaf-se-cae-predio
https://www.biobiochile.cl/noticias/nacional/region-de-la-araucania/2020/01/13/helicoptero-de-conaf-sufre-rotura-de-su-cola-durante-combate-de-incendio-forestal-en-la-araucania.shtml
https://www.helis.com/database/cn/28553/

https://cdn.jetphotos.com/full/6/11363_1524853871.jpg (photo)

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


Revision history:

Date/timeContributorUpdates
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]]]]

Corrections or additions? ... Edit this accident description