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NTSB Report
July 8, 1989 · Grumman G-164 · N788Y
Guymon, OK
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 8, 1989
Injury Outcomes
1 injury (1 serious injury)
Location
Guymon, OK
Aircraft
Grumman G-164
Tail Number
N788Y
Operator
Gray Ronald W
Injuries
Serious
Aircraft Damage
Substantial
NTSB Number
FTW89DPJ08
DURING PULLUP FOR A TURNAROUND MANEUVER, THE ENG FELL FROM THE AG AIRPLANE. CONTROL WAS LOST & THE AIRPLANE HIT FLAT IN A FIELD. A POST-ACDNT INVESTIGATION REVEALED THE UPPER RIGHT ENG MOUNT (FIREWALL ATTACH BOLT) HAD FAILED FROM FATIGUE. THE LOWER RIGHT BOLT HAD ALSO FAILED PRIOR TO ENG SEPARATION, BUT ITS FACTURE SURFACE WAS TOO BADLY DAMAGED TO VERIFY THE REASON OF FAILURE. THE UPPER LEFT & LOWER LEFT ATTACH BOLTS WERE FOUND NECKED DOWN AT THEIR RESPECTIVE FRACTURES FROM OVERLOAD FAILURE.
NTSB Probable Cause
FAILURE OF THE UPPER RIGHT ENGINE MOUNT (FIREWALL ATTACH BOLT) DUE TO FATIGUE, AND FAILURE OF THE LOWER RIGHT MOUNTING BOLT FOR AN UNKNOWN REASON, WHICH ALLOWED OVERLOAD FAILURE OF THE TWO REMAINING MOUNTING BOLTS AND SEPARATION OF THE ENGINE.
Full Narrative
DURING PULLUP FOR A TURNAROUND MANEUVER, THE ENG FELL FROM THE AG AIRPLANE. CONTROL WAS LOST & THE AIRPLANE HIT FLAT IN A FIELD. A POST-ACDNT INVESTIGATION REVEALED THE UPPER RIGHT ENG MOUNT (FIREWALL ATTACH BOLT) HAD FAILED FROM FATIGUE. THE LOWER RIGHT BOLT HAD ALSO FAILED PRIOR TO ENG SEPARATION, BUT ITS FACTURE SURFACE WAS TOO BADLY DAMAGED TO VERIFY THE REASON OF FAILURE. THE UPPER LEFT & LOWER LEFT ATTACH BOLTS WERE FOUND NECKED DOWN AT THEIR RESPECTIVE FRACTURES FROM OVERLOAD FAILURE.
Flight
Event TypeAccident
Event Time19:15 CDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftGrumman G-164
Tail NumberN788Y
Aircraft CategoryAir
DamageSubstantial
OperatorGray Ronald W
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsP&W · R-985-AN-14B · Reciprocating · 450
Seats1
People & Injuries
Injury Summary1 injury (1 serious injury)
Fatal0
Serious1
Minor0
Uninjured0
Total1
Crew 1Age 40 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind80° @ 7 kt
Visibility15 sm
CeilingNone
Temperature / Dew Point52
Altimeter30.00 inHg
Observation Time23:50
Weather SourceWFAC