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NTSB Report
September 2, 1992 · Piper PA-23-160 · N4305Y
Concord, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
September 2, 1992
Injury Outcomes
2 injuries (2 fatalities)
Location
Concord, CA
Aircraft
Piper PA-23-160
Tail Number
N4305Y
Operator
Chavossy Louis
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
LAX92FA374
The following Brief was modified on April18, 2007, as a result of new information provided to the NTSB. THE AIRCRAFT COLLIDED WITH A BRIDGE WHILE TRYING TO RETURN TO THE AIRPORT AFTER REPORTING AN EMERGENCY DURING THE PREVIOUS TOUCH AND GO LANDING. WITNESSES INDICATED BOTH ENGINES SOUNDED LIKE THEY WERE RUNNING AND BOTH PROPELLERS WERE TURNING. THE LEFT ENGINE PROPELLER WAS FOUND FEATHERED AFTER THE ACCIDENT. INVESTIGATION REVEALED A 1.75 INCH OD PLUG INSTALLED IN THE CRANKSHAFT TO SEPARATE OIL PRESSURE FROM THE PROPELLER GOVERNOR AND THE ENGINE CRANKCASE WAS BLOWN AFT DAMAGING THE NUMBER ONE ROD CONNECTING JOURNAL OIL TRANSFER TUBE. EXAMINATION OF THE PLUG DISCLOSED THAT IT WAS INSTALLED BACKWARDS.
NTSB Probable Cause
The following Probable Cause was modified on April18, 2007, as a result of new information provided to the NTSB. THE IMPROPER INSTALLATION OF THE 1.75 INCH OD PLUG IN THE CRANKSHAFT BY UNKNOWN MAINTENANCE PERSONNEL WHICH RESULTED IN AN INADVERTENT FEATHERING OF THE LEFT ENGINE PROPELLER.
Full Narrative
The following Brief was modified on April18, 2007, as a result of new information provided to the NTSB. THE AIRCRAFT COLLIDED WITH A BRIDGE WHILE TRYING TO RETURN TO THE AIRPORT AFTER REPORTING AN EMERGENCY DURING THE PREVIOUS TOUCH AND GO LANDING. WITNESSES INDICATED BOTH ENGINES SOUNDED LIKE THEY WERE RUNNING AND BOTH PROPELLERS WERE TURNING. THE LEFT ENGINE PROPELLER WAS FOUND FEATHERED AFTER THE ACCIDENT. INVESTIGATION REVEALED A 1.75 INCH OD PLUG INSTALLED IN THE CRANKSHAFT TO SEPARATE OIL PRESSURE FROM THE PROPELLER GOVERNOR AND THE ENGINE CRANKCASE WAS BLOWN AFT DAMAGING THE NUMBER ONE ROD CONNECTING JOURNAL OIL TRANSFER TUBE. EXAMINATION OF THE PLUG DISCLOSED THAT IT WAS INSTALLED BACKWARDS.
Flight
Event TypeAccident
Event Time14:41 PDT
Nearest AirportBuchanan Field (1nm N)
Runway19
Runway Length4400 ft
Runway Width150 ft
Flight Plan FiledNone
Aircraft FireGrd
Aircraft ExplosionNo
Aircraft
AircraftPiper PA-23-160
Tail NumberN4305Y
Aircraft CategoryAir
DamageDestroyed
OperatorChavossy Louis
Operating RulePart 91
Engines2
Engine TypeReciprocating
Engine DetailsLycoming · O-320-B3B · Reciprocating · 160
Seats5
People & Injuries
Injury Summary2 injuries (2 fatalities)
Fatal2
Serious0
Minor0
Uninjured0
Total2
Crew 1Age 40 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind300° @ 13 kt
Visibility40 sm
CeilingNone
Temperature / Dew Point52
Altimeter30.00 inHg
Observation Time21:41
Weather SourceWFAC