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ASN Wikibase Occurrence # 152316
Last updated: 24 September 2021
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Type:Silhouette image of generic H47 model; specific model in this crash may look slightly different
Boeing Vertol BV234LR Chinook (CH-47)
Owner/operator:Columbia Helicopters
Registration: N241CH
MSN: MJ016
Fatalities:Fatalities: 7 / Occupants: 7
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:San Juan, Ucayali -   Peru
Phase: En route
Nature:External load operation
Departure airport:Pucallpa Airport (PCL/SPCL)
Destination airport:Tarapoto Airport (TPP/SPST)
Investigating agency: CIAA Peru
Broke up in mid-air, crashed in the Amazon jungle and caught fire, 5 minutes after take off. All 7 POB employees of the operator. It was under contract to Repsol for petroleum exploration support and was en route to a drilling location in northern Peru with an underslung load. Takeoff weight was circa 48,385 lbs.

The 'green' blade, s/n A-2-036, mounted on the Aft rotor head, had previously been fitted to G-BISO at the time of its accident in 1984. All six blades were refurbished by Columbia Helicopters after that accident and their submergence in the North Sea. It had undergone a number of repairs. A lost of part of this blade precipitated a break-up of the aircraft. The rear pylon was found separated from other wreckage. Pre-existing fatigue cracking was found in the sheet metal structure at Station 534. This resulted in its susceptibility to vibration from a loss of a proportion of a blade. Three possible scenarios resulting in the failure of the green blade are postulated.

Service Bulletin (SB) No. 234-54-0003 was issued on 31 Jan 2013 for an inspection of the rear pylon structure. Three reported cases of structural cracks were found due to this Service Bulletin, two of which were representative of the cracks found on the rear pylon of the crashed helicopter.
Subsequently, the SB No. 234-54-0004 was published on 22 November 2013 for a recurring structural NDT inspection at the pylon fixing points of STA 534 and STA 594 stations. Additionally, SB No. 234-62-0008 was published on 21 November 2013 for recurring visual inspections. FAA AD 2014-13-04 was issued in July 2014.

Sources: (In Spanish and 217Mb!!!)

Accident investigation:
Investigating agency: CIAA Peru
Status: Investigation completed
Download report: Final report


Photo of N241CH courtesy

Quito - Mariscal Sucre (SEQU / UIO) (closed)
18 September 2008; (c) Sandro Rota

Revision history:

07-Jan-2013 21:56 Arjen-lima Added
08-Jan-2013 00:27 ben-haverdee Updated [Time, Aircraft type, Registration, Cn, Location, Phase, Nature, Departure airport, Destination airport, Source]
08-Jan-2013 03:04 TB Updated [Aircraft type, Operator, Other fatalities, Location]
08-Jan-2013 06:16 bizjets101 Updated [Narrative]
08-Jan-2013 08:09 Geno Updated [Time, Operator, Location, Departure airport, Destination airport, Source]
13-Jan-2013 08:57 TB Updated [Cn, Operator, Location, Departure airport, Destination airport, Source, Narrative]
06-Sep-2014 18:05 Aerossurance Updated [Nature, Source, Narrative]
06-Sep-2014 18:07 Aerossurance Updated [Source, Narrative]
12-Jan-2015 09:51 Aerossurance Updated [Source, Narrative]
12-Jan-2015 10:06 Aerossurance Updated [Source]
21-Jan-2016 20:38 Aerossurance Updated [Aircraft type]
24-Sep-2016 09:32 Aerossurance Updated [Source]
24-Sep-2016 09:45 Aerossurance Updated [Time, Source]
24-Sep-2016 14:27 Aerossurance Updated [Nature, Narrative]
24-Sep-2016 15:02 Aerossurance Updated [Source, Narrative]
24-Sep-2016 15:16 Aerossurance Updated [Narrative]
24-Sep-2016 15:18 Aerossurance Updated [Narrative]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
01-Mar-2017 16:19 TB Updated [Source]
27-Dec-2018 18:36 harro Updated [Source, Accident report, ]
27-Aug-2019 17:49 Anon. Updated [Narrative]
22-Sep-2020 10:30 Anon. Updated [Narrative]

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