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NTSB Report
September 8, 1989 · Grumman G-164A · N7498
Franklin, LA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
September 8, 1989
Injury Outcomes
No injuries (1 uninjured)
Location
Franklin, LA
Aircraft
Grumman G-164A
Tail Number
N7498
Operator
Terry Flying Service
Injuries
None
Aircraft Damage
Substantial
NTSB Number
FTW89DRD14
THE AG PILOT HAD JUST FINISHED SPRAYING A LOAD OF CHEMICALS & WAS IN A TURN TO LOOK AT THE NEXT FIELD TO BE SPRAYED, WHEN THE AIRPLANE STARTED TO VIBRATE VIOLENTLY. HE REDUCED POWER & TURNED TO LINE UP WITH A TURNROW FOR A FORCED LANDING. AFTER TOUCHDOWN, THE ACFT ROLLED ABOUT 300 YARDS ON SOFT TERRAIN, THEN NOSED OVER AS THE PLT APPLIED BRAKES TO AVOID A DITCH. A INVESTIGATION REVEALED THAT 13 INCHES OF ONE PROPELLER BLADE WAS MISSING. A EXAM OF THE FRACTURE SURFACE SHOWED INDICATIONS OF A PRE-EXISTING CRACK ON THE LEADING EDGE OF THE BLADE.
NTSB Probable Cause
FATIGUE FAILURE OF THE PROPELLER BLADE, WHICH RESULTED IN SEPARATION OF THE BLADE'S TIP AND SEVERE ENGINE VIBRATION. THE SOFT TERRAIN WAS A RELATED FACTOR.
Full Narrative
THE AG PILOT HAD JUST FINISHED SPRAYING A LOAD OF CHEMICALS & WAS IN A TURN TO LOOK AT THE NEXT FIELD TO BE SPRAYED, WHEN THE AIRPLANE STARTED TO VIBRATE VIOLENTLY. HE REDUCED POWER & TURNED TO LINE UP WITH A TURNROW FOR A FORCED LANDING. AFTER TOUCHDOWN, THE ACFT ROLLED ABOUT 300 YARDS ON SOFT TERRAIN, THEN NOSED OVER AS THE PLT APPLIED BRAKES TO AVOID A DITCH. A INVESTIGATION REVEALED THAT 13 INCHES OF ONE PROPELLER BLADE WAS MISSING. A EXAM OF THE FRACTURE SURFACE SHOWED INDICATIONS OF A PRE-EXISTING CRACK ON THE LEADING EDGE OF THE BLADE.
Flight
Event TypeAccident
Event Time16:00 CDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftGrumman G-164A
Tail NumberN7498
Aircraft CategoryAir
DamageSubstantial
OperatorTerry Flying Service
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsP&W · R-1340-AN-1 · Reciprocating · 600
Seats1
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 47 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind150°
Visibility9 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter29.00 inHg
Weather SourcePILO