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NTSB Report
September 4, 1983 · Cessna 421C · N111FN
Altus, OK
Overview
Report Status
Preliminary report
Event Type
Accident
Date
September 4, 1983
Injury Outcomes
8 injuries (8 fatalities)
Location
Altus, OK
Aircraft
Cessna 421C
Tail Number
N111FN
Operator
Osage Aviation Services
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
FTW83FA416
THE PLT INITIATED A TAKEOFF ON A HOT AFTERNOON WITH 7 PASSENGERS ON BOARD. SHORTLY AFTER LEFT-OFF, 2 WITNESSES OBSERVED WHAT THEY DESCRIBED AS A PUFF OF BLACK SMOKE FROM THE RIGHT ENG. ACCORDING TO WITNESSES, THE ACFT RURNED TO THE LEFT BEFORE CROSSING THE DEPARTURE END OF THE RWY AT LOW ALTITUDE & LOW SPEED. SUBSEQUENTLY, THE ACFT ROLLED RAPIDLY TO THE LEFT & IMPACTED THE GROUND IN A NEAR FLAT ATTITUDE, WITH A HIGH RATE OF SINK, AND SUFFICIENT FORWARD VELOCITY TO SLIDE OR BOUNCE ABOUT 70 FT BEFORE COMING TO REST & BURNING. AN EXAM OF THE WRECKAGE, INCLUDING TEARDOWNS OF BOTH ENGS, REVEALED NO PREIMPACT/MECHANICAL MALFUNCTION OR FAILURE. THE ACFT WAS ESTIMATED TO BE 80 LBS BELOW ITS MAX DESIGN GROSS WT. ITS CENTER OF GRAVITY WAS COMPUTED TO BE 1.45 INCHES AFT OF ITS REAR LIMIT. THE TEMP WAS 101 DEG & THE DENSITY ALTITUDE WAS ABOUT 4000 FT.
Full Narrative
THE PLT INITIATED A TAKEOFF ON A HOT AFTERNOON WITH 7 PASSENGERS ON BOARD. SHORTLY AFTER LEFT-OFF, 2 WITNESSES OBSERVED WHAT THEY DESCRIBED AS A PUFF OF BLACK SMOKE FROM THE RIGHT ENG. ACCORDING TO WITNESSES, THE ACFT RURNED TO THE LEFT BEFORE CROSSING THE DEPARTURE END OF THE RWY AT LOW ALTITUDE & LOW SPEED. SUBSEQUENTLY, THE ACFT ROLLED RAPIDLY TO THE LEFT & IMPACTED THE GROUND IN A NEAR FLAT ATTITUDE, WITH A HIGH RATE OF SINK, AND SUFFICIENT FORWARD VELOCITY TO SLIDE OR BOUNCE ABOUT 70 FT BEFORE COMING TO REST & BURNING. AN EXAM OF THE WRECKAGE, INCLUDING TEARDOWNS OF BOTH ENGS, REVEALED NO PREIMPACT/MECHANICAL MALFUNCTION OR FAILURE. THE ACFT WAS ESTIMATED TO BE 80 LBS BELOW ITS MAX DESIGN GROSS WT. ITS CENTER OF GRAVITY WAS COMPUTED TO BE 1.45 INCHES AFT OF ITS REAR LIMIT. THE TEMP WAS 101 DEG & THE DENSITY ALTITUDE WAS ABOUT 4000 FT.
Flight
Event TypeAccident
Event Time16:07 CDT
Nearest AirportALTUS (1nm SSE)
Runway17
Runway Length5000 ft
Runway Width75 ft
Flight Plan FiledNone
Aircraft FireGrd
Aircraft ExplosionGrd
Aircraft
AircraftCessna 421C
Tail NumberN111FN
Aircraft CategoryAir
DamageDestroyed
OperatorOsage Aviation Services
Operating RulePart 91
Engines2
Engine TypeReciprocating
Engine DetailsContinental · GTSIO 520L · Reciprocating · 375
Seats8
People & Injuries
Injury Summary8 injuries (8 fatalities)
Fatal8
Serious0
Minor0
Uninjured0
Total8
Crew 1Age 63 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind180° @ 15 kt, gusting 20 kt
Visibility15 sm
CeilingNone
Temperature / Dew Point10 C / 54
Altimeter0
Observation Time20:55
Weather SourceWFAC