Hiller UH-12E N4027K

Summary

On 5 January 1984 at about 22:50 local time, a Hiller UH-12E registered N4027K was involved in an accident near Mapleton, Oregon, United States. One person was on board and one had minor injuries. The aircraft was substantially damaged. No probable cause statement is available for this record.

Date

5 January 1984 at 22:50

Classification

Accident

Location

Mapleton, Oregon, United States

Coordinates

44.0004, -123.8391

Aircraft

Hiller UH-12E

Registration

N4027K

Category

Helicopter

Engines

1

Operator

Not recorded

Operating rule

Part 137: Agricultural

Purpose of flight

Aerial Application

Phase of flight

Not recorded

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

SEA84LA034

1 person had minor injuries.

The NTSB has not published a probable cause for this record. No probable cause statement is present in the source data.

Nothing about the cause is stated here that is not in the source record.

Read the full NTSB narrative

WHILE APPROACHING THE SPRAY AREA, THE ACFT WAS IN A LEVEL ATTITUDE AT 20 TO 25 MPH & ABOUT 100 FT AGL WHEN THE PLT HEARD A LOUD BANG & NOTED A LOSS OF POWER. HE ATTEMPTED AN AUTOROTATIVE LANDING. DURING TOUCHDOWN ON HILLY TERRAIN, THE ACFT ROLLED TO THE RIGHT & CAME TO REST INVERTED ON A STEEP SLOPE. A TEARDOWN OF THE ENG REVEALED THAT A SPUR ADAPTER GEARSHAFT, PN 6890482, & A COMPRESSOR COUPLING ADAPTER, PN 6871472, HAD FAILED. FAILURE OF THE SPUR ADAPTER GEARSHAFT WAS DUE TO FATIGUE WHICH ORIGINATED AT AN AREA OF HEAVY WEAR ON THE LOAD SIDE OF THE FORWARD SPLINES.

Quoted verbatim from the NTSB record.