NTSB Identification: SEA86LA089.
The docket is stored on NTSB microfiche number 30647.
Accident occurred Saturday, March 29, 1986 in WALLA WALLA, WA
Aircraft: HILLER 12E, registration: N87595
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.

A CATASTROPHIC FAILURE OF THE PLANETARY GEAR OF THE TRANSMISSION OCCURRED ABOUT 51 FLIGHT HOURS AFTER OVERHAUL. DURING FORCED LANDING A HARD LANDING OCCURRED SEVERING THE TAIL BOOM. A FIRE THEN ERUPTED.

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

PROPELLER SYSTEM/ACCESSORIES,PLANETARY GEAR..FAILURE,TOTAL

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

MAINTENANCE,OVERHAUL..IMPROPER..PILOT IN COMMAND

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