WPR15LA116

NTSB accident investigation · Bell 47G 2A · Ivanhoe, CA · February 27, 2015

Accident · Serious injuriesLimited investigationFinal report
Date
February 27, 2015, 10:30 local (18:30 UTC)
Place
Ivanhoe, CA
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N4774SBell 47G 2A
Defining event
Maneuvering-low-alt flying: Abrupt maneuver
Weather
Visual (VMC) · Day
Status
Completed · report September 6, 2017
Report
Approved by Office Director
NTSB office
Western Pacific Region
Parties
FAA
FAA report
20150227001849A
Case key
90794

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

Probable cause

The pilot’s failure to maintain clearance from a power line while maneuvering at low altitude.

Findings · 4

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Object/animal/substance: wireEnvironmental issues › Physical environment · Decision related to conditionBell 47G-2A: 2 casesAll aircraft: 588 casesProbable cause
Performance/control parameters: altitudeAircraft › Aircraft oper/perf/capability · Not attained/maintainedBell 47G-2A: 2 casesAll aircraft: 1,310 casesProbable cause
Object/animal/substance: wireEnvironmental issues › Physical environment · Effect on operationBell 47G-2A: 2 casesAll aircraft: 588 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The commercial pilot was maneuvering the helicopter at low altitude to conduct agricultural spraying operations. While departing the coverage area, the pilot saw power lines and attempted to fly underneath them, but the helicopter's main rotor mast struck a wire, and the helicopter subsequently collided with terrain. The pilot reported no mechanical failures or malfunctions with the helicopter that would have precluded normal operation.

Factual narrative

On February 27, 2015, at 1030 Pacific standard time, a Bell 47G 2A, N4774S, collided with a suspended power line 15 miles northeast of Ivanhoe, California. The helicopter was registered to Barton Aero, Inc., and operated by Gilbert Aviation as a 14 Code of Federal Aviation, Part 137 aerial application flight. The commercial pilot was seriously injured, and the helicopter was substantially damaged. Visual meteorological conditions prevailed, and a flight plan had not been filed. A Federal Aviation Administration (FAA) inspector who spoke to the pilot, stated that the pilot knew about the power line and attempted to avoid it at the last second by flying under it. The wire caught the main rotor mast and the helicopter came to rest on its right side in an orange tree orchard. The pilot was able to self extract, and sustained numerous broken bones. Examination of the helicopter wreckage by the inspector confirmed that a electrical power cable had wrapped around the helicopter's rotor mast. The pilot reported no mechanical failures or malfunctions with the helicopter that would have precluded normal operation.

Aircraft

Registration
N4774S
Reported as
Bell 47G 2A
Category
Helicopter
Serial number
WAV182
Built
1965
Airframe hours
4,089
Engine
Lycoming VO-435 A1F, 220 horsepower, reciprocating
Damage
Substantial damage
Flight
Aerial application · Part 137
Operator
Barton Aero Inc
Registered owner
Barton Aero Inc
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · January 11, 2015
Departed
D86 · Visalia, CA
Destination
D86 · Visalia, CA

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
50
Injuries
Serious
Certificate
Commercial
Airplane ratings
Single-engine land
Medical
Class 2, Unknown
Seat
Left
Restraint
4-point
Flight hours
4,920 total · 0 in the last 90 days · 0 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
6 statute miles
Lowest ceiling
None
Temperature
59 °F, dew point 46 °F
Altimeter
29.86 inHg
Observed at
KVIS, 15 nm away

Docket · 3

The files NTSB released with the investigation on July 17, 2017, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.2 MB in all.

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.

Other investigations on N4774S · 2

Matched to the same aircraft by N-number and date.