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NTSB Report

July 11, 1989 · Piper PA-25 · N6663Z

Wh Sulphur Spgs, MT

Overview

Report Status

Probable Cause

Event Type

Accident

Date

July 11, 1989

Injury Outcomes

No injuries (1 uninjured)

Location

Wh Sulphur Spgs, MT

Aircraft

Piper PA-25

Tail Number

N6663Z

Operator

Morgan Boyd J

Injuries

None

Aircraft Damage

Substantial

NTSB Number

DEN89LA167

THE PLT WAS ON AN AERIAL APPLICATION FLT, SPRAYING WEEDS NEXT TO HILLY TERRAIN. HE RPRTD THAT AS HE WAS IN A RIGHT TURN (LAST SPRAY RUN), THE ACFT ENCOUNTERED AN UNEXPECTED TAILWIND & EXTREME TURBULENCE. SUBSEQUENTLY, IT SETTLED & COLLIDED WITH THE GROUND.

NTSB Probable Cause

THE PILOT FAILED TO MAINTAIN ADEQUATE AIRSPEED DURING AN AERIAL APPLICATION MANEUVER AND INADVERTENTLY ALLOWED THE AIRCRAFT TO MUSH INTO THE GROUND. UNFAVORABLE WIND AND TURBULENCE WERE CONSIDERED TO BE CONTRIBUTING FACTORS.

Full Narrative

THE PLT WAS ON AN AERIAL APPLICATION FLT, SPRAYING WEEDS NEXT TO HILLY TERRAIN. HE RPRTD THAT AS HE WAS IN A RIGHT TURN (LAST SPRAY RUN), THE ACFT ENCOUNTERED AN UNEXPECTED TAILWIND & EXTREME TURBULENCE. SUBSEQUENTLY, IT SETTLED & COLLIDED WITH THE GROUND.

Flight

Event TypeAccident

Event Time14:45 MDT

Nearest Airport0nm N

Runway0

Runway Length0

Runway Width0

Flight Plan FiledNone

Aircraft FireNo

Aircraft ExplosionNo

Aircraft

AircraftPiper PA-25

Tail NumberN6663Z

Aircraft CategoryAir

DamageSubstantial

OperatorMorgan Boyd J

Operating RulePart 137

Engines1

Engine TypeReciprocating

Engine DetailsLycoming · O-540 · Reciprocating · 235

Seats1

People & Injuries

Injury SummaryNo injuries (1 uninjured)

Fatal0

Serious0

Minor0

Uninjured1

Total1

Crew 1Age 44 · Second Class

Conditions

ConditionsVMC

LightDaylight

Wind360° @ 15 kt

Visibility15 sm

CeilingNone

Temperature / Dew Point0 C / 0 C

Altimeter0

Weather SourcePILO

500 – Data service is offline

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July 11, 1989 · Piper PA-25 · N6663Z

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