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ASN Wikibase Occurrence # 216120
Last updated: 5 July 2020
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Date:07-OCT-2018
Time:13:40
Type:Silhouette image of generic EN28 model; specific model in this crash may look slightly different
Enstrom F-28C
Owner/operator:J
Registration: N5691Y
C/n / msn: 479-2
Fatalities:Fatalities: 0 / Occupants: 4
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Bridgeville, Sussex County, DE -   United States of America
Phase: Initial climb
Nature:Survey
Departure airport:Bridgeville, DE
Destination airport:Bridgeville, DE
Investigating agency: NTSB
Narrative:
The commercial pilot had performed numerous local sightseeing helicopter flights the day of the accident. During the accident flight lift off from the field with power lines and farm equipment nearby, the pilot increased the throttle to the maximum engine and rotor rpm and began a climbing left turn toward power lines, during which he noticed the rotor rpm slowing. He slightly decreased collective pitch and further increased the throttle, but the rotor rpm did not increase. The pilot then increased collective pitch even farther as the helicopter cleared the power lines, which exacerbated the low rotor rpm state and was contrary to guidance published in the helicopter's pilot's operating handbook. The pilot's power management allowed the rotor rpm to decay below a point at which sustained flight was possible. Subsequently, the helicopter descended and impacted an open field hard, which resulted in substantial damage to the tailboom and tail rotor. The pilot did not report any preimpact mechanical malfunctions or failures with the helicopter, which was confirmed by a postaccident examination and test run of the helicopter's engine. The pilotís mismanagement of collective pitch control led to the helicopter entering a low rotor rpm state and its subsequent inability to maintain flight.


Probable Cause: The pilot's mismanagement of collective pitch control during takeoff from an area with numerous obstacles, which resulted in the helicopter entering a low rotor rpm state and a forced hard landing.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20181007X13002&key=1
FAA register: https://registry.faa.gov/AircraftInquiry/NNum_Results.aspx?NNumbertxt=5691Y

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year 1 month
Download report: Final report


Revision history:

Date/timeContributorUpdates
07-Oct-2018 22:40 Geno Added
08-Oct-2018 02:58 Geno Updated [Aircraft type, Registration, Cn, Source]
08-Oct-2018 18:26 Iceman 29 Updated [Source, Embed code]
08-Oct-2018 20:44 Aerossurance Updated [Time, Phase, Nature, Narrative, Plane category]
10-Oct-2018 15:55 Anon. Updated [Aircraft type, Registration]
10-Oct-2018 15:56 harro Updated [Cn, Source]
27-Nov-2019 07:17 ASN Update Bot Updated [Time, Operator, Nature, Departure airport, Destination airport, Source, Narrative, Accident report, ]

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