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NTSB Report
June 18, 1989 · Uhley-Mason R.A.F. Vari-Eze R.A.F. VAR · N2UM
Lantana, FL
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 18, 1989
Injury Outcomes
1 injury (1 fatality)
Location
Lantana, FL
Aircraft
Uhley-Mason R.A.F. Vari-Eze R.A.F. VAR
Tail Number
N2UM
Operator
Slattery Eugene M
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
MIA89FA177
WITNESSES STATED THE ENG FAILED ABRUPTLY AS THE ACFT MADE A RIGHT TURN AFTER TAKEOFF. THE ENG WAS PLACED ON A TEST STAND AFTER THE ACCIDENT AND OPERATED TO FULL POWER WITH NO EVIDENCE OF FAILURE OR MALFUNCTION. UNCONTAMINATED FUEL WAS FOUND IN THE AIRFRAME AND ENG FUEL SYSTEM AFTER THE ACCIDENT. THE ENG IGNITION SWITCHES WERE DESTROYED IN THE ACCIDENT AND THE POSITION OF THESE SWITCHES COULD NOT BE DETERMINED. WITNESSES TO THE ACCIDENT OBSERVED THE ENG OPERATE ON THE TEST STAND AND WHEN THE IGNITION SWITCHES WERE TURNED OFF THE ENG FAILED ABRUPTLY. THEY IDENTIFIED THIS FAILURE MODE AS SIMILAR TO THE INFLIGHT FAILURE OF THE ENG. THE OTHER OWNER OF THE ACFT STATED HE HAD INADVERTENTLY TURNED OFF THE IGNITION SWITCHES A FEW YEARS BEFORE WHEN HE BUMPED THEM WHILE CLOSING THE AIR VENT. HE STATED THE POINT IN THIS FLIGHT THAT THE ENG FAILED WOULD HAVE BEEN THE POINT THE PLT WOULD HAVE CLOSED THE AIR VENT.
NTSB Probable Cause
PILOTS INADVERTENT TURNING OFF OF THE ENGINE IGNITION SWITCHES RESULTING IN ENGINE FAILURE.
Full Narrative
WITNESSES STATED THE ENG FAILED ABRUPTLY AS THE ACFT MADE A RIGHT TURN AFTER TAKEOFF. THE ENG WAS PLACED ON A TEST STAND AFTER THE ACCIDENT AND OPERATED TO FULL POWER WITH NO EVIDENCE OF FAILURE OR MALFUNCTION. UNCONTAMINATED FUEL WAS FOUND IN THE AIRFRAME AND ENG FUEL SYSTEM AFTER THE ACCIDENT. THE ENG IGNITION SWITCHES WERE DESTROYED IN THE ACCIDENT AND THE POSITION OF THESE SWITCHES COULD NOT BE DETERMINED. WITNESSES TO THE ACCIDENT OBSERVED THE ENG OPERATE ON THE TEST STAND AND WHEN THE IGNITION SWITCHES WERE TURNED OFF THE ENG FAILED ABRUPTLY. THEY IDENTIFIED THIS FAILURE MODE AS SIMILAR TO THE INFLIGHT FAILURE OF THE ENG. THE OTHER OWNER OF THE ACFT STATED HE HAD INADVERTENTLY TURNED OFF THE IGNITION SWITCHES A FEW YEARS BEFORE WHEN HE BUMPED THEM WHILE CLOSING THE AIR VENT. HE STATED THE POINT IN THIS FLIGHT THAT THE ENG FAILED WOULD HAVE BEEN THE POINT THE PLT WOULD HAVE CLOSED THE AIR VENT.
Flight
Event TypeAccident
Event Time15:34 EDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftUhley-Mason R.A.F. Vari-Eze R.A.F. VAR
Tail NumberN2UM
Aircraft CategoryAir
DamageDestroyed
OperatorSlattery Eugene M
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-235-L2C · Reciprocating · 118
Seats2
People & Injuries
Injury Summary1 injury (1 fatality)
Fatal1
Serious0
Minor0
Uninjured0
Total1
Crew 1Age 58 · Third Class
Conditions
ConditionsVMC
LightDaylight
Wind90° @ 13 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point70 F
Altimeter30.00 inHg
Observation Time19:50
Weather SourceWFAC