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NTSB Report
October 9, 1983 · Cessna 421C · N770JW
Center, CO
Overview
Report Status
Preliminary report
Event Type
Accident
Date
October 9, 1983
Injury Outcomes
No injuries (3 uninjured)
Location
Center, CO
Aircraft
Cessna 421C
Tail Number
N770JW
Injuries
None
Aircraft Damage
Substantial
NTSB Number
DEN84FA004
THE ACFT COLLIDED WITH A DIRT BANK AFTER A LEFT ENGINE OVERSPEED AND LOSS OF DIRECTIONAL CONTROL DURING TAKEOFF. THE PLTHAD ALREADY ABORTED ONE TAKEOFF DUE TO OVERBOOST AND A STICKING WASTEGATE. THE PROBLEM SEEMED CORRECTED AFTER WORK AND LUBRICATION BY A MECHANIC AND WORKED SATISFACTORILY FOR ABOUT A MONTH. THEN DURING THIS TKOF THE OVERBOOST WAS ENOUGH TOCAUSE THE PLT TO LOSE DIRECTIONAL CONTROL AND DEPART THE RWY. THE PLT WAS TRYING TO 'SAVE THE TAKEOFF' BY RETURNING TO THE RWY WHEN THE ACFT WING STRUCK A DIRT PILE. POST ACCIDENT INVESTIGATION SHOWED THAT A STICKING VALVE IN THE TURBOCHARGER WASTEGATE OF THE LEFT ENGINE AND A STUCK PRESSURE RELIEF VALVE CAUSED THE OVERBOOST CONDITION.
Full Narrative
THE ACFT COLLIDED WITH A DIRT BANK AFTER A LEFT ENGINE OVERSPEED AND LOSS OF DIRECTIONAL CONTROL DURING TAKEOFF. THE PLTHAD ALREADY ABORTED ONE TAKEOFF DUE TO OVERBOOST AND A STICKING WASTEGATE. THE PROBLEM SEEMED CORRECTED AFTER WORK AND LUBRICATION BY A MECHANIC AND WORKED SATISFACTORILY FOR ABOUT A MONTH. THEN DURING THIS TKOF THE OVERBOOST WAS ENOUGH TOCAUSE THE PLT TO LOSE DIRECTIONAL CONTROL AND DEPART THE RWY. THE PLT WAS TRYING TO 'SAVE THE TAKEOFF' BY RETURNING TO THE RWY WHEN THE ACFT WING STRUCK A DIRT PILE. POST ACCIDENT INVESTIGATION SHOWED THAT A STICKING VALVE IN THE TURBOCHARGER WASTEGATE OF THE LEFT ENGINE AND A STUCK PRESSURE RELIEF VALVE CAUSED THE OVERBOOST CONDITION.
Flight
Event TypeAccident
Event Time10:20 MDT
Nearest AirportLEACH (0nm N)
Runway30
Runway Length7100 ft
Runway Width48 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 421C
Tail NumberN770JW
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines2
Engine TypeReciprocating
Engine DetailsContinental · GTSIO-520-N · Reciprocating · 375
Seats8
People & Injuries
Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Age 51 · Third Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility100 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter0
Weather SourcePILO