WPR12LA065

NTSB accident investigation · Bell 407 · Rock Springs, WY · December 13, 2011

Accident · Minor injuriesLimited investigationFinal report
Date
December 13, 2011, 16:20 local (23:20 UTC)
Place
Rock Springs, WY
Injuries
5 minor
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N8067ZBell 407
Defining event
Maneuvering-low-alt flying: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed · report February 12, 2013
Report
Approved by Office Director
NTSB office
Western Pacific Region
Parties
Federal Aviation Administration
FAA report
20111213028699A
Case key
82512

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 unauthorized operation of the helicopter by a non-certificated and unqualified individual who failed to maintain helicopter control.

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.

Experience/qualificationsPersonnel issues › Experience/knowledge · PilotAll aircraft: 18 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotAll aircraft: 9,295 casesProbable cause
Performance/control parametersAircraft › Aircraft oper/perf/capability · Not attained/maintainedAll aircraft: 1,269 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 individual flying the helicopter neither held a pilot certificate nor had any documented experience flying helicopters. He was employed by the operator as a company mechanic. He took the helicopter without permission and was giving 4 acquaintances a ride in the area. While maneuvering at low altitude near one of the passenger’s homes, the helicopter entered an uncontrolled descent and collided with the ground.

Factual narrative

On December 13, 2011, about 1620 mountain standard time, a Bell 407, N8067Z, was maneuvering at a low altitude and airspeed near the residence of some of the passengers when it descended into an open field about 12 miles west-northwest of the Rock Springs-Sweetwater County Airport, Rock Springs, Wyoming. The helicopter impacted the ground hard and was substantially damaged. The helicopter’s landing gear skids and lower cabin structure were deformed, and the tail boom was severed. Guardian Flight, South Jordan, Utah, owned and operated the helicopter. The pilot and four passengers sustained minor injuries. The flight was performed under the provisions of 14 Code of Federal Regulations Part 91. Visual meteorological conditions prevailed, and no flight plan was filed. The flight began from Rock Springs about 1600. The passengers reported that the pilot, who was an employee of Guardian Flight, immediately departed the scene. The pilot has not reported the accident to the National Transportation Safety Board. Guardian Flight management personnel reported that the pilot was not authorized to fly the helicopter, and he was employed as their Rock Springs helicopter mechanic. Law enforcement authorities reported they apprehended the pilot in another state. Federal Aviation Administration personnel reported that the pilot was issued a student pilot certificate in 1988, and they have no record of him holding any additional pilot certificate. He does hold a mechanic certificate with airframe and powerplant ratings and inspection authorization. An acquaintance of the accident pilot reported that he observed the pilot flying N8067Z on several previous occasions for personal reasons. Passengers were carried during these “joy rides.”

Aircraft

Registration
N8067Z
Reported as
Bell 407
Category
Helicopter
Serial number
53573
Engine
Rolls-Royc 250-C47B, 600 horsepower, turbo shaft
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Guardian Flight
Registered owner
Guardian Flight
Airworthiness certificate
Standard, Normal
Departed
RKS · Rock Springs, UT
Destination
RKS · Rock Springs, UT

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
45
Injuries
None
Medical
Class 2, Without waivers/limitations
Seat
Right

Weather

Conditions
Visual (VMC) · Day
Wind
250° at 12 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
27 °F, dew point 19 °F
Altimeter
29.87 inHg
Observed at
RKS, 10 nm away

Docket · 8

The files NTSB released with the investigation on December 15, 2012, on NTSB’s docket system: statements, records, photos and specialists’ reports. 9.0 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.