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ASN Wikibase Occurrence # 74026
Last updated: 3 August 2020
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Date:21-APR-2010
Time:11:01
Type:Silhouette image of generic H500 model; specific model in this crash may look slightly different
McDonnell Douglas MD 500E (369E)
Owner/operator:Air 2 LLC
Registration: N400MB
C/n / msn: 0420E
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Near Grassy Brook Road, Brookline, VT -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Cargo
Departure airport:Newfane, VT
Destination airport:Newfane, VT
Investigating agency: NTSB
Narrative:
The accident occurred during a procedure to install a hold-down block onto a pulling rope located between powerline structures. An all stop order to quit pulling the rope was reportedly given 3 to 5 minutes before the accident and confirmed by the pilot via radio before maneuvering to begin the hold-down block installation. No movement of the pulling rope was reported by personnel associated with the installation. The pilot confirmed there was adequate clearance to work and positioned the helicopter near one of the structures as the additional lineman in the helicopter installed the hold-down block. After completion, the lineman in the helicopter saw two waves in the pulling rope. The first wave missed the helicopter but the second wave contacted the main rotor blade, wrapping around the main rotor mast. The lineman jumped into the helicopter, which descended to the ground and came to rest on its left side nearly inverted. The operator reported that there was no preimpact mechanical failure or malfunction with the helicopter. No determination could be made as to the reason for the reported wave in the pulling rope.
Probable Cause: The pilot's inadvertent encounter with a rope while maneuvering during powerline operations for undetermined reasons.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20100421X52801&key=1


Revision history:

Date/timeContributorUpdates
21-Apr-2010 13:52 RobertMB Added
21-Apr-2010 23:22 chulian1819 Updated [Total fatalities]
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
26-Nov-2017 16:34 ASN Update Bot Updated [Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative]
26-Nov-2017 17:11 harro Updated [Aircraft type, Other fatalities, Nature]

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