WPR19FA246

NTSB accident investigation · Beech 33 · St. Ignatius, MT · August 29, 2019

Accident · FatalClass 3 · FieldFinal report
Date
August 29, 2019, 16:00 local (22:00 UTC)
Place
St. Ignatius, MT · Private ranch
Injuries
3 fatal
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N9529YBeech 33
Defining event
Maneuvering-low-alt flying: Low altitude operation/event
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 3
NTSB office
Western Pacific Region
Parties
FAA Flight Standards District Office, Continental Aerospace Technologies, Textron Aviation
FAA report
20190829011699A
Case key
100173

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

Probable cause

The pilot’s decision to maneuver the airplane at a low altitude, which resulted in impact with power lines and terrain.

Findings · 4

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Performance/control parameters: altitudeAircraft › Aircraft oper/perf/capability · Not attained/maintainedBeech 35-B33: 1 caseAll aircraft: 1,310 casesProbable cause
Object/animal/substance: wireEnvironmental issues › Physical environment · Effect on operationBeech 35-B33: 1 caseAll aircraft: 588 cases

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The pilot and two passengers departed on a multi-leg cross-country flight. Video from a camera affixed to the airplane’s right wing indicated that, as the airplane approached a ranch near the destination airport, the pilot overflew a set of power distribution lines, then descended to a lower altitude to overfly the ranch. The airplane impacted a second set of power lines, severing the left wing, left aileron, and the upper sections of the rudder and vertical stabilizer, then descended to the ground. Multiple witnesses reported hearing the airplane approaching the ranch, then seeing the airplane impact the power distribution lines. One witness stated that the pilot often overflew the ranch to announce his arrival but that he had never seen him fly that low. Examination of the airplane revealed no evidence of mechanical malfunctions or anomalies that would have precluded normal operation. The circumstances of the accident are consistent with the pilot’s decision to fly at low altitude and his failure to maintain clearance from powerlines, which resulted in impact with power lines and, subsequently, terrain.

Factual narrative

On August 29, 2019, about 1600 mountain daylight time, a Beech BE-33 airplane, N9529Y, was substantially damaged when it was involved in an accident near St. Ignatius, Montana. The pilot and two passengers were fatally injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. The pilot and passengers departed on a multi-leg cross-country flight with a destination of St. Ignatius Airport (52S), St. Ignatius, Montana. As the flight was nearing its destination, multiple witnesses located on a ranch, reported that they observed the airplane approaching, then saw sparks and a wing come off the airplane as it passed through a set of power distribution lines. One witness stated that the pilot’s approach to the area was “as usual,” as he often flew over the ranch to notify those there that he would be landing at the airport; but he had “never seen him that low.” The pilot’s wife stated that he had flown to the destination airport numerous times and that he was going there to help with an electrical problem. A GoPro video camera was attached to the top of the right wing near the wing root. The camera contained multiple short videos of the first and second leg of the flight. One video recorded the airplane as it overflew a set of power distribution lines and continued to descend as it approached the ranch from the west. After arriving over the ranch, the airplane flew past a second set of power distribution lines that appeared to be at the same altitude as the airplane. After passing the power distribution lines, the video camera instantly pointed up, and the airplane appeared to roll left as it descended to the ground. The airplane impacted and severed one of three powerlines strung between towers. Another wire was still intact and had a section of airplane sheet metal attached. At their lowest point, the wires were about 53 ft above ground level. The airplane came to rest inverted in a flat hay field. The entire left wing separated from the fuselage in two sections. The inboard section of the wing was found near the main wreckage. The outboard 4-foot section, along with portions of the vertical stabilizer and rudder and were found about 100 ft from the powerlines. The separated portion of the wing displayed striations consistent with the size and diameter of the power transmission lines found nearby. Examination of the airframe and engine revealed no evidence of mechanical failures or malfunctions that would have precluded normal operation.

Aircraft

Registration
N9529Y
Reported as
Beech 33 (35B33)
Category
Airplane
Serial number
CD-555
Built
1962
Airframe hours
887.6
Engine
Continental IO-470-N(1), reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · March 11, 2019
Departed
VTN · Valentine, NE
Destination
52S · St. Ignatius, NE
Equipment
ADS-B, Handheld GPS, Video recording device

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
49
Injuries
Fatal
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Seat
Left
Restraint
3-point
Toxicology
Performed
Flight hours
755 total · 700 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
300° at 7 knots
Visibility
10 statute miles
Lowest ceiling
11,000 ft broken
Temperature
73 °F, dew point 45 °F
Altimeter
30.03 inHg
Observed at
KMSO, 25 nm away

Docket · 9

The files NTSB released with the investigation on October 6, 2021, on NTSB’s docket system: statements, records, photos and specialists’ reports. 18.2 MB in all.

FAA reports on this event · 1

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