CEN16LA289

NTSB accident investigation · Bell OH 58A · Lake Mills, IA · July 22, 2016

Accident · Minor injuriesLimited investigationFinal report
Date
July 22, 2016, 16:00 local (21:00 UTC)
Place
Lake Mills, IA
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N288NSBell OH 58A
Defining event
Maneuvering: Controlled flight into terr/obj (CFIT)
Weather
Visual (VMC) · Day
Status
Completed · report September 1, 2016
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA-Des Moines FSDO
FAA report
20160722011409A
Case key
93700

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

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Probable cause

The pilot's inadequate visual lookout, which resulted in a wire strike.

Findings · 3

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.

Performance/control parameters: altitudeAircraft › Aircraft oper/perf/capability · Not attained/maintainedBell OH-58A: 4 casesAll aircraft: 1,310 casesProbable cause
Object/animal/substance: wireEnvironmental issues › Physical environment · Effect on operationBell OH-58A: 9 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 performing an agricultural application flight. The pilot reported that, while spraying a field, the helicopter struck a wire that he did not see. The pilot reported that after striking the wire, the helicopter came to a stop, and then the wire broke. The pilot flew the helicopter to the ground, and the helicopter hit hard and then flipped onto its side. The pilot reported no mechanical failures or malfunctions of the helicopter.

Factual narrative

On July 22, 2016, about 1600 central daylight time, a Bell OH-58A helicopter, N288NS, sustained substantial damage when it struck a wire and the ground during an aerial application pass near Lake Mills, Iowa. The pilot received minor injuries. The helicopter was registered to North Star Holdings, Inc., and operated by North Star Helicopters, Inc. under the provisions of 14 Code of Federal Regulations Part 137 as an agricultural flight. Visual meteorological conditions prevailed for the flight, which was not on a flight plan. The local flight originated from a farm near Northwood, Iowa, about 1430.The pilot reported that the while spraying a field, he hit a wire that he did not see. The wire went into the upper wire cutter, bringing the helicopter to a stop, and then the wire broke. He flew the helicopter to the ground, hitting hard and the helicopter flipped onto its side. He reported no mechanical failures or malfunctions of the helicopter.

Aircraft

Registration
N288NS
Reported as
Bell OH 58A (NO SERIES)
Category
Helicopter
Serial number
70-15288
Built
1970
Airframe hours
9,862
Engine
Rolls Royce 250-T63-A720, 420 horsepower, turbo shaft
Damage
Substantial damage
Fire
Unknown
Flight
Aerial application · Part 137
Operator
North Star Helicopter Inc
Registered owner
North Star Holdings Inc
Airworthiness certificate
Special, Restricted (Special)
Last inspection
Annual · April 27, 2016
Departed
PVT · Northwood, IA
Destination
PVT · Northwood, IA
Equipment
None

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
52
Injuries
Minor
Certificate
Commercial
Airplane ratings
Single-engine land
Medical
Class 2, With waivers/limitations
Last flight review
April 16, 2016
Seat
Right
Restraint
4-point
Flight hours
8,712 total · 1,443 in this make and model · 8,362 as pilot in command · 19 in the last 90 days · 14 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
70° at 3 knots
Visibility
10 statute miles
Lowest ceiling
2,000 ft broken
Temperature
82 °F, dew point 77 °F
Altimeter
30.01 inHg
Observed at
KFXY, 9 nm away

Docket · 1

The files NTSB released with the investigation on August 8, 2016, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.1 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 N288NS · 1

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