DEN83LA115

NTSB accident investigation · Bell 47G-3B-1 · Montrose, CO · May 20, 1983

Accident · Minor injuriesLimited investigationFinal report
Date
May 20, 1983, 09:43 local (15:43 UTC)
Place
Montrose, CO
Injuries
1 minor, 1 uninjured
Damage
Destroyed
Phase of flight
Maneuvering
Aircraft
N1129WBell 47G-3B-1
Weather
Instrument (IMC) · Day
Status
Completed
Report
Approved by Office Director
FAA report
19830520020619A
Case key
16077

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 encounter with weatherManeuvering
Weather condition - low ceilingFactor
Weather condition - fogFactor
Flight into known adverse weather - continuedPilot in commandCause
In flight collision with objectManeuvering
Object - tree(s)Factor
Terrain condition - open fieldFactor

Analysis

Wx at the departure point was VMC but the surrounding mountans were partially obscured. The plt stated that he was following a road up the mountain & landed as the visibility deteriorated. Each time the cloud lifted the plt would lift-off & again land as the visibility deteriorated. During the 5th trip up the road, visibility was about 1/2 mi. The plt stated the 1st switchback was '...not landable, but the second one appeared to be.' About 1/2 way to the second switchback the ceiling '...plummeted down. The road closed in behind me and I started loosing the next switchback.' Oak brush trees on the hillside bore evidence of being cut & broken next to the wreckage.

Aircraft

Registration
N1129W
Reported as
Bell 47G-3B-1
Category
Helicopter
Serial number
1181028
Airframe hours
9,429
Engine
Allison 250-C20-B, 400 horsepower, turbo shaft
Damage
Destroyed
Fire
On-Ground
Flight
Part 135
Registered owner
Thunderbird Helicopters, Inc.
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · March 1, 1983 · 55 hours before
Departed
Montrose, CO
Destination
Storm King Mtn, CO
Flight plan
Company VFR

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
35
Certificate
Commercial
Airplane ratings
Single-engine land
Medical
Class 2, Valid Medical--no waivers/lim.
Seat
Left
Flight hours
5,874 total · 342 in this make and model · 5,656 as pilot in command · 52 in the last 90 days

Weather

Conditions
Instrument (IMC) · Day
Wind
Calm
Visibility
5 statute miles
Lowest ceiling
100 ft overcast
Temperature
37 °F

FAA reports on this event · 1

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