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NTSB Report
August 18, 2025 · Helio H-391B · N4431U
Monroe, MI
Overview
Report Status
Probable Cause
Event Type
Accident
Date
August 18, 2025
Injury Outcomes
No injuries (1 uninjured)
Location
Monroe, MI
Aircraft
Helio H-391B (1958)
Tail Number
N4431U
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CEN25LA325
The pilot reported that while landing his tailwheel airplane in a crosswind, the airplane bounced upon touchdown. The right wing lifted, the airplane drifted down the runway on the left wheel, and the airplane exited the runway into the grass. The left wheel dug into the grass and the airplane pivoted. During the accident sequence, the left landing gear separated from the fuselage, and the left wing struck the ground. The left wing was substantially damaged. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. At the time of the accident, the pilot was landing the airplane on runway 03 with wind from 100° at 10 knots gusting 15 knots.
NTSB Probable Cause
Aircraft-Aircraft oper/perf/capability-Performance/control parameters-Directional control-Not attained/maintained
Full Narrative
The pilot reported that while landing his tailwheel airplane in a crosswind, the airplane bounced upon touchdown. The right wing lifted, the airplane drifted down the runway on the left wheel, and the airplane exited the runway into the grass. The left wheel dug into the grass and the airplane pivoted. During the accident sequence, the left landing gear separated from the fuselage, and the left wing struck the ground. The left wing was substantially damaged. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. At the time of the accident, the pilot was landing the airplane on runway 03 with wind from 100° at 10 knots gusting 15 knots.
Flight
Event TypeAccident
Event Time13:30 EDT
Nearest AirportCuster Airport (0nm)
Runway03
Runway Length4997 ft
Runway Width100 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHelio H-391B
Tail NumberN4431U
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · GO435C2B2-6 · Reciprocating · 260
Seats4
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 66 · Third Class · None
Conditions
ConditionsVMC
LightDaylight
Wind100° @ 10 kt, gusting 15 kt
Visibility10 sm
CeilingBroken clouds 3200 ft
Temperature / Dew Point63 F
Altimeter30.18 inHg
Observation Time13:35
Weather SourceWFAC