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NTSB Report
February 29, 1992 · Grumman G-164A · N5408
Vernalis, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
February 29, 1992
Injury Outcomes
No injuries (1 uninjured)
Location
Vernalis, CA
Aircraft
Grumman G-164A
Tail Number
N5408
Operator
Trinkle & Boys Agricultural
Injuries
None
Aircraft Damage
Substantial
NTSB Number
LAX92LA131
THE AIRPLANE EXPERIENCED AN UNCONTAINED SEPARATION OF THE SECOND-STAGE STATOR TURBINE WHEEL WHILE EXECUTING AN AERIAL APPLICATION PROCEDURE TURN. THE AIRPLANE'S ALTITUDE WAS INSUFFICIENT FOR THE PILOT TO ALIGN IT WITH THE CULTIVATED FURROWS. THE LANDING WAS NORMAL BUT THE AIRPLANE NOSED OVER ONTO ITS BACK DURING THE LANDING ROLL WHEN THE WHEELS DUG INTO THE FURROWS. EXAMINATION OF THE ENGINE'S LOGBOOK DISCLOSED THAT THE OPERATOR HAD NOT PROPERLY COMPLIED WITH AIRWORTHINESS DIRECTIVE (AD) 86-08-06. THIS AD REQUIRES RADIOGRAPHIC INSPECTION OF THE SECOND-STAGE STATOR TURBINE WHEEL ASSEMBLY.
NTSB Probable Cause
THE OPERATOR'S FAILURE TO PROPERLY COMPLY WITH AN AIRWORTHINESS DIRECTIVE AFFECTING THE SECOND-STAGE TURBINE WHEEL ASSEMBLY. CONTRIBUTING TO THIS ACCIDENT WAS THE UNCONTAINED FAILURE OF THE SECOND-STAGE TURBINE WHEEL AND THE ROUGH/UNEVEN TERRAIN.
Full Narrative
THE AIRPLANE EXPERIENCED AN UNCONTAINED SEPARATION OF THE SECOND-STAGE STATOR TURBINE WHEEL WHILE EXECUTING AN AERIAL APPLICATION PROCEDURE TURN. THE AIRPLANE'S ALTITUDE WAS INSUFFICIENT FOR THE PILOT TO ALIGN IT WITH THE CULTIVATED FURROWS. THE LANDING WAS NORMAL BUT THE AIRPLANE NOSED OVER ONTO ITS BACK DURING THE LANDING ROLL WHEN THE WHEELS DUG INTO THE FURROWS. EXAMINATION OF THE ENGINE'S LOGBOOK DISCLOSED THAT THE OPERATOR HAD NOT PROPERLY COMPLIED WITH AIRWORTHINESS DIRECTIVE (AD) 86-08-06. THIS AD REQUIRES RADIOGRAPHIC INSPECTION OF THE SECOND-STAGE STATOR TURBINE WHEEL ASSEMBLY.
Flight
Event TypeAccident
Event Time09:30 PST
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftGrumman G-164A
Tail NumberN5408
Aircraft CategoryAir
DamageSubstantial
OperatorTrinkle & Boys Agricultural
Operating RulePart 137
Engines1
Engine TypeTurboprop
Engine DetailsGarrett · TPE 331-43BL · Turboprop · 575
Seats1
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 39 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility10 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourcePILO