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NTSB Report
June 17, 1991 · Rockwell S-2R · N8549V
Camilla, GA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 17, 1991
Injury Outcomes
No injuries (1 uninjured)
Location
Camilla, GA
Aircraft
Rockwell S-2R
Tail Number
N8549V
Operator
Maxwell Aviation
Injuries
None
Aircraft Damage
Substantial
NTSB Number
ATL91LA113
THE PILOT REPORTED THAT SHORTLY AFTER TAKEOFF, THE ENGINE SHUDDERED VIOLENTLY, THEN QUIT. THE AIRPLANE WAS FORCE LANDED STRAIGHT AHEAD, AND WAS SUBSTANTIALLY DAMAGED BY THE ENSUING COLLISION WITH TREES. POST-CRASH INSPECTION OF THE ENGINE REVEALED THAT THE SPARK PLUGS WERE BADLY CARBON FOULED. NO COMPRESSION WAS OBSERVED ON THE NUMBER ONE CYLINDER, AND COMPRESSION ON THE REMAINING CYLINDERS WAS ONLY 'FAIR.' DISASSEMBLY OF THE NUMBER ONE CYLINDER REVEALED THAT THE EXHAUST VALVE AND SEAT WERE PARTIALLY BURNED. A HAMMER WAS REQUIRED TO REMOVE THE VALVE FROM THE CYLINDER. THE PISTON WAS BADLY CARBONED. A MECHANIC REPORTED THAT THE OPERATOR WAS USING AUTOMOTIVE GASOLINE IN THIS AIRPLANE, WITHOUT AN STC FOR ITS USE.
NTSB Probable Cause
RESTRICTED EXHAUST VALVE MOVEMENT, LOW CYLINDER COMPRESSION, AND FOULING OF THE ENGINE SPARK PLUGS, WHICH RESULTED IN THE LOSS OF ENGINE POWER. FACTORS WERE THE IMPROPER SERVICING OF THE AIRCRAFT, AND THE USE OF AN IMPROPER FUEL GRADE.
Full Narrative
THE PILOT REPORTED THAT SHORTLY AFTER TAKEOFF, THE ENGINE SHUDDERED VIOLENTLY, THEN QUIT. THE AIRPLANE WAS FORCE LANDED STRAIGHT AHEAD, AND WAS SUBSTANTIALLY DAMAGED BY THE ENSUING COLLISION WITH TREES. POST-CRASH INSPECTION OF THE ENGINE REVEALED THAT THE SPARK PLUGS WERE BADLY CARBON FOULED. NO COMPRESSION WAS OBSERVED ON THE NUMBER ONE CYLINDER, AND COMPRESSION ON THE REMAINING CYLINDERS WAS ONLY 'FAIR.' DISASSEMBLY OF THE NUMBER ONE CYLINDER REVEALED THAT THE EXHAUST VALVE AND SEAT WERE PARTIALLY BURNED. A HAMMER WAS REQUIRED TO REMOVE THE VALVE FROM THE CYLINDER. THE PISTON WAS BADLY CARBONED. A MECHANIC REPORTED THAT THE OPERATOR WAS USING AUTOMOTIVE GASOLINE IN THIS AIRPLANE, WITHOUT AN STC FOR ITS USE.
Flight
Event TypeAccident
Event Time08:30 EDT
Nearest AirportMitchell County (0nm)
Runway8
Runway Length4005 ft
Runway Width60 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftRockwell S-2R
Tail NumberN8549V
Aircraft CategoryAir
DamageSubstantial
OperatorMaxwell Aviation
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsP&W · R-1340-AN1 · Reciprocating · 550
Seats1
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 57 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind220° @ 4 kt
Visibility6 sm
CeilingNone
Temperature / Dew Point70 F
Altimeter29.00 inHg
Observation Time11:48
Weather SourceWFAC