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ASN Wikibase Occurrence # 162996
Last updated: 29 October 2019
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Date:01-JAN-2014
Time:15:07
Type:Silhouette image of generic EC30 model; specific model in this crash may look slightly different
Eurocopter EC 130B4
Owner/operator:Papillon Airways Inc.
Registration: N133GC
C/n / msn: 3883
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Boulder City Municipal Airport (KBVU), NV -   United States of America
Phase: Approach
Nature:Test
Departure airport:Boulder City, NV (KBVU)
Destination airport:Boulder City, NV (KBVU)
Investigating agency: NTSB
Narrative:
The pilot stated that, during a postmaintenance operational check flight and while on final approach for landing, the fuel pressure indicator light illuminated, and the engine “flamed out.” The pilot lowered the collective to initiate an autorotation; however, due to the low altitude and airspeed, the helicopter subsequently landed hard and rolled over. 
During a postaccident examination of the wreckage, a main fuel supply line B-nut fitting was found without the safety wire, and the nut was loose when turned by hand. Before the accident flight, the line had been disconnected during a task to replace the bidirectional suspension cross-bar assembly, and the accident flight was the first flight since the task was performed. According to the noncertificated maintenance technician who performed the task, the line was removed to defuel the fuel tank, which was contrary to manufacturer’s maintenance manual instructions. Based on the evidence, it is likely that the B-nut fitting was not properly tightened and safety-wired during reassembly, which allowed it to back off due to normal engine vibration and resulted in the interruption of the fuel flow during flight.

Probable Cause: A loss of engine power due to fuel starvation as a result of the noncertificated maintenance technician’s failure to properly tighten and safety wire a B-nut fitting. Contributing to the accident was the maintenance technician’s failure to follow the manufacturer’s maintenance manual instructions. 

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20140101X85805&key=1


Revision history:

Date/timeContributorUpdates
03-Jan-2014 08:29 gerard57 Added
03-Jan-2014 09:54 gerard57 Updated [Operator, Source, Narrative]
03-Jan-2014 13:49 harro Updated [Operator, Location, Destination airport]
03-Jan-2014 19:57 Geno Updated [Location, Nature, Departure airport, Destination airport, Source]
03-Jan-2014 20:01 Geno Updated [Aircraft type]
05-Jan-2014 21:55 TB Updated [Time, Aircraft type, Location]
10-Jan-2014 00:51 Geno Updated [Time, Operator, Source, Narrative]
20-Aug-2014 06:22 Aerossurance Updated [Phase, Narrative]
30-Oct-2014 17:25 TB Updated [Aircraft type]
24-Jul-2015 14:33 Aerossurance Updated [Narrative]
12-Aug-2015 16:58 Aerossurance Updated [Source]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
29-Nov-2017 13:21 ASN Update Bot Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative]
22-Dec-2018 08:53 Isabella Barbiero Updated [Other fatalities, Nature]

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