ANC10LA053

NTSB accident investigation · Robinson Helicopter R44 · Unalaska, AK · June 20, 2010

Accident · FatalLimited investigationFinal report
Date
June 19, 2010, 17:00 local (Jun 20, 2010, 01:00 UTC)
Place
Unalaska, AK
Injuries
1 fatal
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N333DVRobinson Helicopter R44
Defining event
Maneuvering-hover: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed · report March 16, 2011
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
FAA FSDO-03
FAA report
20100619037769A
Case key
76386

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 inappropriate low altitude maneuvering, which resulted in a collision with terrain.

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: lateral/bank controlAircraft › Aircraft oper/perf/capability · Capability exceededRobinson Helicopter R44: 4 casesAll aircraft: 390 casesProbable cause
Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedRobinson Helicopter R44: 5 casesAll aircraft: 3,958 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

A ranch employee reported that he and another employee were onboard the helicopter with the pilot when they spotted a bull that had become entangled in plastic wrapping material. Both employees egressed the helicopter in an effort to try to cut the plastic off the animal. The pilot maneuvered the helicopter in an attempt to herd the bull toward them with no success. The pilot then attempted to land the helicopter on a portion of the plastic that was trailing behind the bull, which would aid the employees in being able to approach it. After that was unsuccessful, the pilot tried to knock the bull down with the helicopter. The pilot eventually managed to maneuver the helicopter's right skid under the plastic and began to elevate the bull. As the helicopter moved forward, it moved to the right and impacted the ground, killing the pilot and the bull.

Factual narrative

On June 19, 2010, about 1700 Alaska daylight time, a Robinson R44 helicopter, N333DV, sustained substantial damage when it collided with terrain about 62 miles southwest of Unalaska, Alaska. The helicopter was being operated by the pilot as a visual flight rules (VFR)other work use flight, in conjunction with a cattle ranch, under Title 14, CFR Part 91, when the accident occurred. The solo commercial pilot died in the accident. Visual meteorological conditions prevailed, and company flight following procedures were in effect. During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge on June 19, an official for the cattle ranch said another pilot at the ranch told her the helicopter pilot had just dropped off two employees for a cattle count, and upon departure, the helicopter had "caught a skid," and impacted terrain. The employees attempted to render aid to the accident pilot, but she was told the pilot died. The employees reported they did not think there were any problems with the helicopter prior to the accident. In a written statement provided to the NTSB IIC by one of the ranch employees who witnessed the accident, the witness reported that he and another employee were in the helicopter with the pilot, surveying the ranch property, when they spotted a bull that had become entangled in plastic wrapping material. He said he and the other employee got out of the helicopter, and the pilot attempted to herd the bull toward them so they could cut the plastic off. The witness said the bull would not cooperate, and the pilot tried to land on the trailing plastic so they could tackle the bull. The witness also reported that the pilot tried to knock the bull down with the helicopter. He said eventually the pilot got the helicopter's right landing gear skid under the plastic and tried to pick the bull up, but the plastic broke. He said the pilot hooked the skid under the plastic again, but this time the plastic did not break, and as the helicopter lifted the bull off the ground the helicopter moved forward and to the right, and impacted the ground. Due to the remote location, the helicopter was not examined by the NTSB. A postmortem examination of the pilot was conducted under the authority of the Alaska State Medical Examiner, 4500 South Boniface Parkway, Anchorage, Alaska, on June 25, 2010. The examination revealed the cause of death for the pilot was attributed to multiple blunt force injuries. The FAA's Civil Aeromedical Institute (CAMI) conducted a toxicological examination on August 12, 2010, which detected amounts of Ethanol, Methanol, and N-Propanol. The Ethanol in this case was from sources other than consumption. Ibuprofen was detected in the urine.

Aircraft

Registration
N333DV
Reported as
Robinson Helicopter R44
Category
Helicopter
Serial number
1927
Airframe hours
555
Engine
Lycoming O-540-F1B5, 260 horsepower, reciprocating
Damage
Substantial damage
Flight
Other work use · Part 91
Operator
Bering Pacific Ranches Ltd
Registered owner
Bering Pacific Ranches Ltd
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · May 22, 2010
Departed
Unalaska, AK
Destination
Unalaska, AK

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
48
Injuries
Fatal
Certificate
Commercial
Medical
Class 3, With waivers/limitations
Last flight review
March 17, 2010
Seat
Right
Toxicology
Performed
Flight hours
1,000 total · 400 in this make and model · 1,000 as pilot in command · 8 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
160° at 17 knots, gusting 21
Visibility
10 statute miles
Lowest ceiling
20,000 ft broken
Temperature
54 °F, dew point 37 °F
Altimeter
29.86 inHg
Observed at
PADU, 61 nm away

Docket · 4

The files NTSB released with the investigation on October 28, 2010, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.3 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.