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NTSB Report
July 15, 1984 · Grumman G-164A · N6589
Richey, MT
Overview
Report Status
Preliminary report
Event Type
Accident
Date
July 15, 1984
Injury Outcomes
No injuries (1 uninjured)
Location
Richey, MT
Aircraft
Grumman G-164A
Tail Number
N6589
Injuries
None
Aircraft Damage
Destroyed
NTSB Number
DEN84LA224
THE PLT HAD FINISHED SPRAYING & WAS PROCEEDING TO THE GLENDIVE ARPT. HE SAID THAT ENG OR PROP BEGAN A SUDDEN SEVERE VIBRATION WHICH REQUIRED THE ENG TO BE SHUT DOWN. AN EMEGENCY LANDING WAS MADE. THE PLT STATED THAT THE LEFT WING IMPACTED A HILL WHICH SPUN THE ACFT TO THE LEFT. SUBSEQUENTLY, THE RIGHT MAIN GEAR, TAILWHEEL & THE UPPER & LOWER RIGHT WINGS FAILED. A POST IMPACT FIRE DESTROYED THE ACFT. AN EXAM REVEALED THAT THE OUTER 13 INCHES OF 1 PROP BLADE, P/N 6101A-13, HAD FAILED. ALSO, THE ENG MOUNTING & SEVERAL MOUNTS WERE FOUND BROKEN. RECORDS INDICATED THE HAMILTON STANDARD (PROP HUB 2-D-30-237) HAD BEEN OVERHAULED & TWISTED BLADES HAD BEEN STRAIGHTENED IN 1977. TOTAL TIME ON THE PROP SINCE OVERHAUL WAS 1168 HRS.
Full Narrative
THE PLT HAD FINISHED SPRAYING & WAS PROCEEDING TO THE GLENDIVE ARPT. HE SAID THAT ENG OR PROP BEGAN A SUDDEN SEVERE VIBRATION WHICH REQUIRED THE ENG TO BE SHUT DOWN. AN EMEGENCY LANDING WAS MADE. THE PLT STATED THAT THE LEFT WING IMPACTED A HILL WHICH SPUN THE ACFT TO THE LEFT. SUBSEQUENTLY, THE RIGHT MAIN GEAR, TAILWHEEL & THE UPPER & LOWER RIGHT WINGS FAILED. A POST IMPACT FIRE DESTROYED THE ACFT. AN EXAM REVEALED THAT THE OUTER 13 INCHES OF 1 PROP BLADE, P/N 6101A-13, HAD FAILED. ALSO, THE ENG MOUNTING & SEVERAL MOUNTS WERE FOUND BROKEN. RECORDS INDICATED THE HAMILTON STANDARD (PROP HUB 2-D-30-237) HAD BEEN OVERHAULED & TWISTED BLADES HAD BEEN STRAIGHTENED IN 1977. TOTAL TIME ON THE PROP SINCE OVERHAUL WAS 1168 HRS.
Flight
Event TypeAccident
Event Time11:00 MDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireGrd
Aircraft ExplosionNo
Aircraft
AircraftGrumman G-164A
Tail NumberN6589
Aircraft CategoryAir
DamageDestroyed
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsP&W · R-985 · Reciprocating · 450
Seats1
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 36 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility50 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter29.00 inHg
Weather SourcePILO