DEN87FA016

NTSB accident investigation · Cessna 421C · Butte, MT · November 6, 1986

Accident · FatalField investigationFinal report
Date
November 6, 1986, 04:36 local (11:36 UTC)
Place
Butte, MT
Injuries
1 fatal
Damage
Destroyed
Phase of flight
Approach
Aircraft
N421ARCessna 421C
Weather
Instrument (IMC) · Night/dark
Status
Completed · report March 10, 1988
Report
Approved by Office Director
FAA report
19861106054309A
Case key
17080

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

Plt was attempting the vor-b instrument apch to Butte, MT arpt. Plt reported over the coppertown VORTAC inbound on the arpt. The procedure turn inbound course to the VORTAC is 124 degrees. The inbound course to the arpt is 094 degrees. The acft wreckage was found on the 124 degree radial 5 miles sw of the arpt. The wind was reported to be 340 degrees at 9 KTS. The vor-b apch terminates at rwy 11. Rwy 33 is 9000 ft long and equipped with mirl's and reil's.

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 weatherApproach
Weather condition - low ceilingFactor
In-flight planning/decision - poorPilot in commandCause
Weather condition - snowFactor
Ifr procedure - not followedPilot in commandCause
In flight collision with terrain/waterApproach
Terrain condition - mountainous/hillyFactor
Altitude - improperPilot in commandCause
Clearance - not possiblePilot in commandCause
Visual/aural perceptionPilot in commandFactor

Aircraft

Registration
N421AR
Reported as
Cessna 421C
Category
Airplane
Serial number
421C0254
Airframe hours
2,890
Engine
Continental GTSIO-520-L, 375 horsepower, reciprocating
Damage
Destroyed
Fire
On-Ground
Flight
Part 135
Registered owner
Lynch Flying Service
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · October 20, 1986 · 50 hours before
Departed
HLN · Helena, MT
Flight plan
IFR

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
35
Certificate
Airline transport
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Seat
Left
Toxicology
Performed
Flight hours
4,000 total

Weather

Conditions
Instrument (IMC) · Night/dark
Wind
340° at 9 knots
Visibility
2 statute miles
Lowest ceiling
1,100 ft
Temperature
28 °F, dew point 27 °F
Altimeter
29.00 inHg
Observed at
BTM, 5 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.