DEN86LA040

NTSB accident investigation · Helio H-391B · Bozeman, MT · December 6, 1985

Accident · No injuriesLimited investigationFinal report
Date
December 6, 1985, 14:34 local (21:34 UTC)
Place
Bozeman, MT
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N4101DHelio H-391B
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
FAA report
19851206061059A
Case key
16893

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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Analysis

According to personnel in the area, the plt radioed he had smoke in the cockpit and was returning to gallantin field, his departure point. Later, the plt transmitted that the eng lost total pwr and he was making a forced landing. During the investigation, it was ascertained the wiring between the instrument panel and the magnetos had burned extensively and the magneto 'p' lead had shorted out.

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.

Loss of engine power(total) - mech failure/malfCruise
Electrical system,electric wiring - burnedFactor
Maintenance,annual inspection - inadequateOther maintenance personnelFactor
Electrical system,electric wiring - shortedFactor
Ignition system,magneto - failure,totalCause
Forced landingDescent - emergency
In flight collision with terrain/waterLanding
Terrain condition - snow covered

Aircraft

Registration
N4101D
Reported as
Helio H-391B
Category
Airplane
Serial number
016
Airframe hours
583
Engine
Lycoming GO-435, reciprocating
Damage
Substantial damage
Fire
In-Flight
Flight
Personal · Part 91
Registered owner
Boyne Mountain Lodge, Inc.
Airworthiness certificate
Standard, Normal; Standard, Utility
Last inspection
100 hour · December 6, 1985
Departed
BZN · Bozeman, MT
Destination
Portland, OR

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
Certificate
Private
Airplane ratings
Single-engine land, Single-engine sea
Medical
Class 3, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
3,200 total · 42 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
132° at 3 knots
Visibility
34 statute miles
Lowest ceiling
25,000 ft broken
Temperature
25 °F
Altimeter
30.00 inHg
Observed at
BZN, 2 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.