Hiller UH12L4 N3748Z

Summary

On 12 August 1982 at about 19:40 local time, a Hiller UH12L4 registered N3748Z, operated by Nelsonind, Inc., was involved in an accident near Wisconsin Dells, Wisconsin, United States. 3 people were on board and one was seriously injured, one had minor injuries. The aircraft was substantially damaged. No probable cause statement is available for this record.

Date

12 August 1982 at 19:40

Classification

Accident

Location

Wisconsin Dells, Wisconsin, United States

Coordinates

Not recorded

Aircraft

Hiller UH12L4

Registration

N3748Z

Category

Helicopter

Engines

1

Operator

Nelsonind, Inc.

Operating rule

Part 91: General Aviation

Purpose of flight

Unknown

Phase of flight

Not recorded

Route

Wisconsin Dells → Wisconsin Dells

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

CHI82FA304

1 person was seriously injured.

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

DURING CLIMB, AT ABOUT 200 FT AGL, THE M/R LOST RPM. DURING AUTOROTATION THE ENG RPM INCREASED BEYOND THE RED LINE WHEN THE PLT ADDED POWER. THE HELICOPTER MADE A HARD LANDING IN A RESIDENTIAL AREA. INSPECTION OF THE MERCURY CLUTCH REVEALED THAT THE EXTERIOR SURFACE OF THE CLUTCH DRUM EXHIBITED EVIDENCE OF EXCESSIVE OVERHEATING. THE INSIDE SURFACE OF THE DRUM SHOWED SEVERE GLAZING & DISCOLORATION IN THE CLUTCH SHOE WEAR AREA. THERE WERE ALSO SEVERAL CRACKS IN THE CLUTCH DRUM. THE HOUSING BEARING JOURNAL HAD EXPERIENCED SEVERE PITTING. THERE WAS ALSO SEVERE WEAR IN THE BEARING JOURNAL AREA. THE CLUTCH SHOES SHOWED SIGNIFICANT GLAZING & SURFACE CRACKING, & WERE SEVERELY WORN.

Quoted verbatim from the NTSB record.