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NTSB Report
May 10, 1992 · Cessna 177 · N177RD
Lusby, MD
Overview
Report Status
Probable Cause
Event Type
Accident
Date
May 10, 1992
Injury Outcomes
3 injuries (3 fatalities)
Location
Lusby, MD
Aircraft
Cessna 177
Tail Number
N177RD
Operator
Dennis Construction
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
BFO92FA058
DURING INITIAL CLIMB, THE ENGINE BACKFIRED AND LOST PARTIAL POWER, AND THE AIRPLANE CRASHED INTO WOODED TERRAIN ABOUT 250 FT BEYOND THE END OF THE RUNWAY. THE CARBURETOR WAS DISASSEMBLED, AND ALL COMPONENTS WERE ACCOUNTED FOR EXCEPT THE PRIMARY VENTURI. TWO OF THE THREE LEGS WHICH RETAINS THE VENTURI WERE SEPARATED, THE THIRD WAS COMPLETELY MISSING. VISUAL EXAMINATION OF THE REMAINING PORTIONS OF THE TWO SEPARATED LEGS REVEALED A MELTED AND RESOLIDIFIED APPEARANCE. ONE LEG PIECE WAS REMOVED FROM THE THROTTLE BODY, ULTRASONICALLY CLEANED IN ACETONE, AND SUBJECTED TO X-RAY ENERGY DISPERSIVE SPECTROSCOPY (EDS) IN AREAS THAT HAD A FRESH METAL APPEARANCE. THIS ANALYSIS GENERATED SPECTRA WITH LARGE ZINC PEAKS AND A MUCH SMALLER PEAK FOR ALUMINUM.
NTSB Probable Cause
A FAILURE OF THE CARBURETOR RESULTING IN A LOSS OF ENGINE POWER.
Full Narrative
DURING INITIAL CLIMB, THE ENGINE BACKFIRED AND LOST PARTIAL POWER, AND THE AIRPLANE CRASHED INTO WOODED TERRAIN ABOUT 250 FT BEYOND THE END OF THE RUNWAY. THE CARBURETOR WAS DISASSEMBLED, AND ALL COMPONENTS WERE ACCOUNTED FOR EXCEPT THE PRIMARY VENTURI. TWO OF THE THREE LEGS WHICH RETAINS THE VENTURI WERE SEPARATED, THE THIRD WAS COMPLETELY MISSING. VISUAL EXAMINATION OF THE REMAINING PORTIONS OF THE TWO SEPARATED LEGS REVEALED A MELTED AND RESOLIDIFIED APPEARANCE. ONE LEG PIECE WAS REMOVED FROM THE THROTTLE BODY, ULTRASONICALLY CLEANED IN ACETONE, AND SUBJECTED TO X-RAY ENERGY DISPERSIVE SPECTROSCOPY (EDS) IN AREAS THAT HAD A FRESH METAL APPEARANCE. THIS ANALYSIS GENERATED SPECTRA WITH LARGE ZINC PEAKS AND A MUCH SMALLER PEAK FOR ALUMINUM.
Flight
Event TypeAccident
Event Time18:20 EDT
Nearest AirportChesapeake Ranch Airstrip (1nm W)
Runway31
Runway Length2500 ft
Runway Width50 ft
Flight Plan FiledNone
Aircraft FireGrd
Aircraft ExplosionGrd
Aircraft
AircraftCessna 177
Tail NumberN177RD
Aircraft CategoryAir
DamageDestroyed
OperatorDennis Construction
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320-E2D · Reciprocating · 150
Seats4
People & Injuries
Injury Summary3 injuries (3 fatalities)
Fatal3
Serious0
Minor0
Uninjured0
Total3
Crew 1Age 61 · Third Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility6 sm
CeilingBroken clouds 8000 ft
Temperature / Dew Point64 F / 55
Altimeter30.00 inHg
Observation Time21:55
Weather SourceWFAC