WPR25LA221

NTSB accident investigation · Beech B35 · Helena, MT · July 24, 2025

Accident · Minor injuriesClass 4 · LimitedFinal report
Date
July 23, 2025, 21:45 local (Jul 24, 2025, 03:45 UTC)
Place
Helena, MT
Injuries
1 minor, 1 uninjured
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N5204CBeech B35
Defining event
Approach-VFR go-around: Aerodynamic stall/spin
Weather
Visual (VMC) · Dusk
Status
Completed · report September 26, 2025
Report
Approved by Office Director
Investigation class
Class 4 - Basic report with no Prelim publish
NTSB office
Western Pacific Region
Parties
FAA
FAA report
20250723008649A
Case key
200625

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 failure to properly configure the airplane during a go-around which resulted in the airplane exceeding its critical angle of attack and an aerodynamic stall at a low altitude.

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.

Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotBeech B35: 3 casesAll aircraft: 9,295 casesProbable cause
Action: incorrect action selectionPersonnel issues › Action/decision · PilotBeech B35: 1 caseAll aircraft: 397 casesProbable cause
Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Not attained/maintainedBeech B35: 1 caseAll aircraft: 1,681 casesProbable cause

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 was returning to his home airport and approached the airport from the north. He was initially cleared to land runway 27 but requested to land runway 17 because he was conveniently aligned with it. When about five miles from the airport he slowed the airplane, lowered the landing gear, and “pulled the throttle all the way back.” He stated that he did not recall “raising the propeller speed.” He further stated that he was too high, and extended the flaps to full down, which was something he normally did not do. During the landing flare, he waited for the airplane to settle onto the runway. He realized that the airplane had not touched down as it passed the midpoint of the 2,989 ft long runway and initiated a go-around. During the go-around, the pilot initially thought he had pushed the throttle control full forward, but when “nothing happened,” he looked down and realized he had pushed the mixture control forward. He added throttle and felt the airplane pick up speed. The pilot recalled that he pulled the yoke back to clear the airport perimeter fence and felt the airplane climb. The pilot stated that he had a positive rate of climb and thought he was high enough to begin a left turn and considered raising the flaps and contacting the tower when the airplane impacted the ground and slid into a building. A security video captured the airplane in a wings level attitude beyond the departure end of the runway. The airplane appeared to reach a height of about 20 ft above ground level before the left wing dropped and the airplane descended. Subsequently, it impacted a road and slid into a building, which resulted in substantial damage to both wings. Postaccident pictures of the airplane showed that the landing gear was extended and the flaps were retracted. The throttle control was pulled out about ½-inch, and the mixture control was about 1 ½-inch from full forward. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Aircraft

Registration
N5204C
Reported as
Beech B35
Category
Airplane
Serial number
D-2549
Built
1950
Airframe hours
12,160
Engine
Continental E225-8, 225 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Peace Sign LLC
Registered owner
Peace Sign LLC
Airworthiness certificate
Standard, Normal
Last inspection
Annual · March 18, 2025 · 16 hours before
Departed
GTF · Great Falls, MT
Destination
Same as departure
Airport
HLN · Helena Rgnl, runway 17/35, 2,989 × 75 ft, asphalt
Equipment
ADS-B, Auto-pilot, Electronic flight bag or handheld device, Stall warning system

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
66
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Medical
BasicMed
Last flight review
October 1, 2023
Seat
Left
Restraint
Lap only
Flight hours
692 total · 88 in this make and model · 610 as pilot in command · 17 in the last 90 days · 7 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Dusk
Wind
Variable at 4 knots
Lowest ceiling
None
Temperature
71 °F, dew point 35 °F
Altimeter
26.09 inHg
Observed at
HLN, 0.5 nm away
METAR
9:53 PM 71 °F 35 °F 27 % W 8 mph 0 mph 26.09 in 0.0 in Fair

Docket · 5

The files NTSB released with the investigation on September 26, 2025, on NTSB’s docket system: statements, records, photos and specialists’ reports. 24.3 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.