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ASN Wikibase Occurrence # 162003
Last updated: 11 December 2018
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Date:09-NOV-2013
Time:12:45
Type:Silhouette image of generic EC35 model; specific model in this crash may look slightly different
Eurocopter EC 135P1
Owner/operator:Metro Aviation Inc
Registration: N911KB
C/n / msn: 0013
Fatalities:Fatalities: 0 / Occupants: 3
Aircraft damage: Substantial
Category:Accident
Location:Metro Aviation Heliport (41LA), Shreveport, LA -   United States of America
Phase: Initial climb
Nature:FLTS
Departure airport:Shreveport, LA
Destination airport:Shreveport, LA
Investigating agency: NTSB
Narrative:
The helicopter departed on a local maintenance test flight to perform a hover test. The pilot flew the helicopter toward a nearby field to perform the test and then heard a “pop,” and the helicopter subsequently began to spin. The pilot attempted to regain control of the helicopter using the antitorque pedals, but they were ineffective. The pilot reduced engine power and performed an autorotation to the field. The helicopter landed hard and rolled on its right side.
Examination of the wreckage found that the antitorque pedals had separated from the antitorque levers. The attachment hardware was not located in the wreckage or the surrounding area. Neither the antitorque pedals nor the lever attachment holes displayed elongation, which is consistent with the hardware bolts not being in place at the time of impact. A review of maintenance logbooks revealed that a mechanic had conducted maintenance on the antitorque pedals 9 days before the accident flight. After the accident, a parts bag containing bolts similar to the bolts needed to secure the antitorque pedals was found in the maintenance facility where the maintenance was performed. Based on the evidence, it is likely that the mechanic reinstalled the antitorque pedals without the required attachment hardware, which allowed the antitorque pedals to separate from the antitorque levers during flight and led to the loss of helicopter control.
Probable Cause: The mechanic's improper installation of the antitorque pedals, which resulted in an in-flight loss of helicopter control.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20131112X12840&key=1


Revision history:

Date/timeContributorUpdates
10-Nov-2013 07:51 ppick Added
10-Nov-2013 07:53 harro Updated [Time, Nature, Source, Embed code]
10-Nov-2013 17:12 Geno Updated [Other fatalities, Location, Departure airport, Destination airport, Embed code]
14-Nov-2013 05:38 Geno Updated [Source, Narrative]
27-Nov-2013 14:57 TB Updated [Aircraft type, Operator, Location, Phase, Source]
22-Nov-2015 20:12 Aerossurance Updated [Time, Operator, Phase, Source, Narrative]
22-Nov-2015 22:57 Aerossurance Updated [Source]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
29-Nov-2017 09:22 ASN Update Bot Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Embed code, Narrative]

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