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NTSB Report
October 21, 1990 · Daniel S Taylor Sonerai II LS Sonerai II · N148DT
Prattville, AL
Overview
Report Status
Probable Cause
Event Type
Accident
Date
October 21, 1990
Injury Outcomes
1 injury (1 fatality)
Location
Prattville, AL
Aircraft
Daniel S Taylor Sonerai II LS Sonerai II
Tail Number
N148DT
Operator
Olesen James T
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
MIA91FA014
DURING THE PREVIOUS 4 MOS, THE ENG WAS EXPERIENCING A HOTTER CYLINDER HEAD TEMP OF THE LT REAR CYLINDER THAN THE RT. THE ENG COWLING WAS MODIFIED TO CORRECT THIS BUT THE PROBLEM CONTINUED. THE CYLINDER HEADS WHICH WERE PREVIOUSLY REMOVED WERE INSTALLED THE DAY BEFORE THE ACCIDENT. THE ENG WAS RUN FOR 30 MINUTES WITH NO DISCREPANCIES NOTED. THE MORNING OF THE ACCIDENT, THE ACFT WAS SERVICED WITH FUEL, THE ENG WAS CHECKED, & THE ACFT WAS FLOWN TWICE AROUND THE TRAFFIC PATTERN. THE TEMP PROBLEM CONTINUED. ATTEMPTS TO CORRECT THIS WERE UNSUCCESSFUL DURING A SUBSEQUENT FLT AROUND THE PATTERN. THE RT SIDE OF THE COWLING WAS MODIFIED. THE FLT DEPARTED & AT AN ALT OF 500 FT, THE ACFT WAS OBSERVED IN AN UNCOORDINATED LT TURN. THE ACFT STALLED, DESCENDED LT WING LOW & CRASHED IN A FIELD. EXAM OF THE ACFT REVEALED NO FLT CONTROL MALFUNCTION. EXAM OF THE ENG REVEALED EVIDENCE OF A LEAN FUEL/AIR MIXTURE BUT THE REASON COULD NOT BE DETERMINED.
NTSB Probable Cause
THE PILOT'S FAILURE TO MAINTAIN AIRSPEED. FACTORS WERE UNDETERMINED LOSS OF ENGINE POWER AND LACK OF EXPERIENCE IN TYPE.
Full Narrative
DURING THE PREVIOUS 4 MOS, THE ENG WAS EXPERIENCING A HOTTER CYLINDER HEAD TEMP OF THE LT REAR CYLINDER THAN THE RT. THE ENG COWLING WAS MODIFIED TO CORRECT THIS BUT THE PROBLEM CONTINUED. THE CYLINDER HEADS WHICH WERE PREVIOUSLY REMOVED WERE INSTALLED THE DAY BEFORE THE ACCIDENT. THE ENG WAS RUN FOR 30 MINUTES WITH NO DISCREPANCIES NOTED. THE MORNING OF THE ACCIDENT, THE ACFT WAS SERVICED WITH FUEL, THE ENG WAS CHECKED, & THE ACFT WAS FLOWN TWICE AROUND THE TRAFFIC PATTERN. THE TEMP PROBLEM CONTINUED. ATTEMPTS TO CORRECT THIS WERE UNSUCCESSFUL DURING A SUBSEQUENT FLT AROUND THE PATTERN. THE RT SIDE OF THE COWLING WAS MODIFIED. THE FLT DEPARTED & AT AN ALT OF 500 FT, THE ACFT WAS OBSERVED IN AN UNCOORDINATED LT TURN. THE ACFT STALLED, DESCENDED LT WING LOW & CRASHED IN A FIELD. EXAM OF THE ACFT REVEALED NO FLT CONTROL MALFUNCTION. EXAM OF THE ENG REVEALED EVIDENCE OF A LEAN FUEL/AIR MIXTURE BUT THE REASON COULD NOT BE DETERMINED.
Flight
Event TypeAccident
Event Time17:05 CDT
Nearest AirportAutauga County (0nm N)
Runway9
Runway Length3499 ft
Runway Width75 ft
Flight Plan FiledNone
Aircraft FireGrd
Aircraft ExplosionNo
Aircraft
AircraftDaniel S Taylor Sonerai II LS Sonerai II
Tail NumberN148DT
Aircraft CategoryAir
DamageDestroyed
OperatorOlesen James T
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsVolkswagen · 2180CC · Reciprocating
Seats2
People & Injuries
Injury Summary1 injury (1 fatality)
Fatal1
Serious0
Minor0
Uninjured0
Total1
Crew 1Age 20 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind110° @ 7 kt
Visibility7 sm
CeilingBroken clouds 12000 ft
Temperature / Dew Point61 F
Altimeter30.00 inHg
Observation Time22:31
Weather SourceWFAC