DEN85FA027

NTSB accident investigation · Bell 206B-11 · Bingham Canyon, UT · November 15, 1984

Accident · FatalField investigationFinal report
Date
November 15, 1984, 16:36 local (23:36 UTC)
Place
Bingham Canyon, UT
Injuries
4 fatal
Damage
Destroyed
Phase of flight
Maneuvering
Aircraft
N1077TBell 206B-11
Weather
Visual (VMC) · Dusk
Status
Completed
Report
Approved by Office Director
FAA report
19841115062109A
Case key
16513

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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Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

In flight collision with objectManeuvering
Object - wire,transmissionFactor
Judgment - poorPilot in commandFactor
Visual/aural detectionPilot in commandFactor
Light condition - sunglareFactor
Visual lookout - inadequatePilot in commandFactor
Lack of familiarity with geographic areaPilot in commandFactor
Window,flight compartment window/windshield - dirty(foggy)Factor
Loss of control - in flightDescent - uncontrolled
In flight collision with terrain/waterDescent - uncontrolled
Terrain condition - ground
Terrain condition - mountainous/hillyFactor

Analysis

Pilot was taking passeengers on a sightseeng flight over the kennecott copper mine, largest open pit copper mine in the world. Helicopter collided with unmarked power lines approx 185 ft AGL. Power lines are supported by two unmarked towers on opposing hills 1983 ft apart.

Aircraft

Registration
N1077T
Reported as
Bell 206B-11
Category
Helicopter
Serial number
2928
Airframe hours
14,187
Engine
Allison 250-C20B, 317 horsepower, turbo shaft
Damage
Destroyed
Fire
On-Ground
Flight
Part 91
Registered owner
Robert C. Foster
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · September 23, 1984 · 643 hours before
Departed
Salt Lake City, UT
Airport
Unknown

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
37
Certificate
Commercial
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane, Helicopter
Medical
Class 2, Valid Medical--no waivers/lim.
Seat
Right
Toxicology
Performed
Flight hours
1,398 total · 190 in this make and model · 956 as pilot in command · 10 in the last 90 days

Weather

Conditions
Visual (VMC) · Dusk
Wind
330° at 7 knots
Visibility
30 statute miles
Lowest ceiling
30,000 ft broken
Temperature
43 °F, dew point 30 °F
Altimeter
30.00 inHg
Observed at
SLC, 18 nm away

FAA reports on this event · 1

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