DEN89LA221

NTSB accident investigation · Mooney M20C · Neihart, MT · September 18, 1989

Accident · Serious injuriesLimited investigationFinal report
Date
September 18, 1989, 07:22 local (13:22 UTC)
Place
Neihart, MT
Injuries
1 serious
Damage
Destroyed
Phase of flight
Enroute
Aircraft
N3456XMooney M20C
Weather
Instrument (IMC) · Day
Status
Completed · report January 22, 1991
Report
Approved by Office Director
FAA report
19890918035389A
Case key
17785

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

VFR flight by the pilot into instrument meteorological conditions (IMC) and his failure to maintain sufficient altitude. Related factors were: the high terrain and adverse weather conditions.

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 weatherCruise
Weather condition - cloudsFactor
Weather condition - low ceilingFactor
Weather condition - fogFactor
Weather condition - rainFactor
Vfr flight into imc - continuedPilot in commandCause
In flight collision with objectDescent
Terrain condition - high terrainFactor
Terrain condition - tree(s)Factor
Proper altitude - not maintainedPilot in commandCause

Analysis

The instrument rated commercial pilot reported that he was cruising at 14,500 feet when he encountered clouds. He descended to 12,500 feet and then to 11,000 feet in an effort to avoid the weather. He stated 'I descended down to eleven thousand and the trees came right up on me. I was VFR, didn't file a flight plan . . .' Elevation of the crash site was 9175 feet.

Aircraft

Registration
N3456X
Reported as
Mooney M20C
Category
Airplane
Serial number
3411
Engine
Lycoming O-360-A1D, 180 horsepower, reciprocating
Damage
Destroyed
Flight
Personal · Part 91
Registered owner
Finster, John N.
Airworthiness certificate
Standard, Normal
Departed
MT02 · Hardin, MT
Destination
LWS · Lewiston, ID

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
39
Certificate
Commercial
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Expired
Flight hours
1,632 total

Weather

Conditions
Instrument (IMC) · Day
Wind
310° at 9 knots
Temperature
-0 °F, dew point 10 °F
Altimeter
29.00 inHg
Observed at
GTF, 43 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.