Hiller UH-12E N93431

Summary

On 10 June 1984 at about 18:36 local time, a Hiller UH-12E registered N93431 was involved in an accident near Merrimac, Wisconsin, United States. One person was on board and one died. The aircraft was destroyed. No probable cause statement is available for this record.

Date

10 June 1984 at 18:36

Classification

Accident

Location

Merrimac, Wisconsin, United States

Coordinates

43.3703, -89.6193

Aircraft

Hiller UH-12E

Registration

N93431

Category

Helicopter

Engines

1

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Public Use

Phase of flight

Not recorded

Route

Baraboo → Unknown

Aircraft damage

Destroyed

Weather

VMC

Light

Day

NTSB number

CHI84FA226

1 person died.

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

THE ACFT CRASHED AND BURNED AFTER AN IN-FLT EXPLOSION AT ABOUT 75 FT AGL AS THE ACFT APPROACHED TO LAND. THE ACFT HAD EXPERIENCED ELECTRICAL PROBLEMS OF OVERHEATING GENERATORS AND IRREGULAR VOLTAGE OUTPUTS ON 2 PREVIOUS OCCASIONS. THE PLTWAS TOLD AFTER SOME REPAIRS THAT IF HE SMELLED ANYTHING HOT TO PULL THE GENERATOR CIRCUIT BREAKER. POST-ACCIDENT ACFT EXAMINATION SHOWED A CONDITION OF THE VOLTAGE REGULATOR WHICH WOULD HAVE CAUSED CONTINUOUS CHARGING OF THE BATTERY. THE GENERATOR SHOWED SIGNS OF OVERHEATING AND THE BATTERY HAD EXPLODED AWAY FROM THE WRECKAGE WITH THE TERMINAL POLES MELTEDOFF.

Quoted verbatim from the NTSB record.