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NTSB Report
March 27, 1989 · Beech F33A · N3042Z
Lamar, CO
Overview
Report Status
Probable Cause
Event Type
Accident
Date
March 27, 1989
Injury Outcomes
No injuries (1 uninjured)
Location
Lamar, CO
Aircraft
Beech F33A
Tail Number
N3042Z
Operator
Ruth M Davis
Injuries
None
Aircraft Damage
Substantial
NTSB Number
DEN89LA095
DRG A X-COUNTRY FLT THE ALTERNATOR OUT LIGHT ILLUMINATED & THE PLT DIVERTED TO THE CLOSEST ARPT WHICH WAS AT LAMAR, CO. THE ACFT ARRIVED AT LAMAR WITH THE ELECTRICAL SYSTEM DEPLETED. THE PLT WAS UNABLE TO EXTEND THE LANDING GEAR WITH THE NORMAL (ELECTRICAL) SYSTEM, SO SHE EXTENDED THE GEAR MANUALLY TO WHAT SHE THOUGHT WAS THE FULLY EXTENDED POSITION. SHE SAID THE ENG OIL PRESSURE GAUGE WAS INDICATING LOW, SO SHE ELECTED TO LAND ON A ROAD. DURING THE LANDING ALL THREE GEAR COLLAPSED. BEFORE STOPPING, THE ACFT WENT OFF THE SIDE OF THE ROAD & WAS FURTHER DAMAGED. A POST-ACDNT INSPN OF THE ACFT REVEALED AN ALTERNATOR BEARING HAD FAILED. NO REASON FOR THE RPRTD DROP IN OIL PRESSURE WAS FND.
NTSB Probable Cause
FAILURE OF AN ALTERNATOR BEARING WHICH RESULTED IN TOTAL LOSS OF ELECTRICAL POWER AFTER THE BATTERY BECAME DISCHARGED, AND FAILURE OF THE PILOT TO INSURE THE GEAR WAS FULLY EXTENDED DURING A PRECAUTIONARY LANDING. THE PILOT'S LACK OF FAMILIARITY WITH THE GEAR EXTENSION SYSTEM WAS A CONTRIBUTING FACTOR.
Full Narrative
DRG A X-COUNTRY FLT THE ALTERNATOR OUT LIGHT ILLUMINATED & THE PLT DIVERTED TO THE CLOSEST ARPT WHICH WAS AT LAMAR, CO. THE ACFT ARRIVED AT LAMAR WITH THE ELECTRICAL SYSTEM DEPLETED. THE PLT WAS UNABLE TO EXTEND THE LANDING GEAR WITH THE NORMAL (ELECTRICAL) SYSTEM, SO SHE EXTENDED THE GEAR MANUALLY TO WHAT SHE THOUGHT WAS THE FULLY EXTENDED POSITION. SHE SAID THE ENG OIL PRESSURE GAUGE WAS INDICATING LOW, SO SHE ELECTED TO LAND ON A ROAD. DURING THE LANDING ALL THREE GEAR COLLAPSED. BEFORE STOPPING, THE ACFT WENT OFF THE SIDE OF THE ROAD & WAS FURTHER DAMAGED. A POST-ACDNT INSPN OF THE ACFT REVEALED AN ALTERNATOR BEARING HAD FAILED. NO REASON FOR THE RPRTD DROP IN OIL PRESSURE WAS FND.
Flight
Event TypeAccident
Event Time11:20 MST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBeech F33A
Tail NumberN3042Z
Aircraft CategoryAir
DamageSubstantial
OperatorRuth M Davis
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · IO-520-BB · Reciprocating · 285
Seats5
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 61 · Third Class
Conditions
ConditionsVMC
LightDaylight
Wind360°
Visibility15 sm
CeilingNone
Temperature / Dew Point70 F / 0 C
Altimeter0
Weather SourcePILO