NTSB Identification: DEN84LA224.
The docket is stored on NTSB microfiche number 24852.
Accident occurred Sunday, July 15, 1984 in RICHEY, MT
Aircraft: GRUMMAN G-164A, registration: N6589
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

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.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

PROPELLER SYSTEM/ACCESSORIES,BLADE..FAILURE,TOTAL



Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY


Contributing Factors

TERRAIN CONDITION..DIRT BANK/RISING EMBANKMENT



Index for Jul1984 | Index of months