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NTSB Report
July 8, 1991 · Cessna 320 · N3011T
Reno, NV
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 8, 1991
Injury Outcomes
No injuries (1 uninjured)
Location
Reno, NV
Aircraft
Cessna 320
Tail Number
N3011T
Operator
David E Baskett
Injuries
None
Aircraft Damage
Substantial
NTSB Number
LAX91LA300
THE PILOT STATED THAT HE APPLIED FULL POWER AND THE AIRCRAFT WAS ACCELERATING THROUGH 30 KNOTS ON THE TAKEOFF GROUND ROLL WHEN HE HEARD A LOUD EXPLOSION. THE PILOT ABORTED THE TAKEOFF AND TAXIED BACK TO THE RAMP. INSPECTION OF THE AIRCRAFT REVEALED THAT A CLAMP WHICH RETAINS ONE OF THE FEATHERING COUNTER WEIGHTS ON THE LEFT PROPELLER HAD SEPARATED, AND THE COUNTER WEIGHT PENETRATED THROUGH THE NOSE STRUCTURE OF THE AIRCRAFT. THE FAILED CLAMP ASSEMBLY WAS SENT TO THE FACTORY UNDER THE SUPERVISION OF THE FAA CHICAGO AIRCRAFT CERTIFICATION OFFICE FOR DETAILED ANALYSIS. ACCORDING TO THE REPORT OF THE EXAMINATION, THE FRACTURE WAS FOUND TO BE OF A FATIGUE TYPE, WITH THE ORIGIN ON THE LOWER INSIDE CORNER OF THE STEEL STRAP. CHEMICAL AND HARDNESS TESTS OF THE ASSEMBLY REVEALED THAT THE PART MET SPECIFICATIONS. THE REASON FOR THE FRACTURE INITIATION WAS UNDETERMINED.
NTSB Probable Cause
THE FATIGUE FAILURE OF THE PROPELLER FEATHERING COUNTER WEIGHT CLAMP ASSEMBLY.
Full Narrative
THE PILOT STATED THAT HE APPLIED FULL POWER AND THE AIRCRAFT WAS ACCELERATING THROUGH 30 KNOTS ON THE TAKEOFF GROUND ROLL WHEN HE HEARD A LOUD EXPLOSION. THE PILOT ABORTED THE TAKEOFF AND TAXIED BACK TO THE RAMP. INSPECTION OF THE AIRCRAFT REVEALED THAT A CLAMP WHICH RETAINS ONE OF THE FEATHERING COUNTER WEIGHTS ON THE LEFT PROPELLER HAD SEPARATED, AND THE COUNTER WEIGHT PENETRATED THROUGH THE NOSE STRUCTURE OF THE AIRCRAFT. THE FAILED CLAMP ASSEMBLY WAS SENT TO THE FACTORY UNDER THE SUPERVISION OF THE FAA CHICAGO AIRCRAFT CERTIFICATION OFFICE FOR DETAILED ANALYSIS. ACCORDING TO THE REPORT OF THE EXAMINATION, THE FRACTURE WAS FOUND TO BE OF A FATIGUE TYPE, WITH THE ORIGIN ON THE LOWER INSIDE CORNER OF THE STEEL STRAP. CHEMICAL AND HARDNESS TESTS OF THE ASSEMBLY REVEALED THAT THE PART MET SPECIFICATIONS. THE REASON FOR THE FRACTURE INITIATION WAS UNDETERMINED.
Flight
Event TypeAccident
Event Time16:15 PDT
Nearest AirportReno-Cannon (0nm N)
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 320
Tail NumberN3011T
Aircraft CategoryAir
DamageSubstantial
OperatorDavid E Baskett
Operating RulePart 91
Engines2
Engine TypeReciprocating
Engine DetailsContinental · TSI0-470 · Reciprocating · 260
Seats5
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 48 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind270° @ 15 kt
Visibility35 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter0
Weather SourcePILO