Hiller UH-12E N3829

Summary

On 22 May 1989 at about 14:00 local time, a Hiller UH-12E registered N3829, operated by A.i.r. Helicopter Service, Inc, was involved in an accident near Waterford, Wisconsin, United States. One person was on board and nobody was injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

22 May 1989 at 14:00

Classification

Accident

Location

Waterford, Wisconsin, United States

Coordinates

42.7599, -88.2094

Aircraft

Hiller UH-12E

Registration

N3829

Category

Helicopter

Engines

1

Operator

A.i.r. Helicopter Service, Inc

Operating rule

Part 91: General Aviation

Purpose of flight

Positioning

Phase of flight

Not recorded

Route

Waterford → Unknown

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

CHI89DEP04

Nobody was injured.

THE PILOT'S INABILITY TO MAINTAIN CONTROL DURING AN AUTOROTATIONAL LANDING ATTEMPT FOLLOWING THE FAILURE OF THE MAIN ROTOR DRIVE TRAIN TORSIONAL COUPLING.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

WHILE IN NORMAL CRUISE FLIGHT THE HELICOPTER EXPERIENCED A VIBRATION. THE PILOT ELECTED TO MAKE A PRECAUTIONARY LANDING AND DURING ATTEMPTED AUTOROTATION CONTROL WAS LOST. THE INVESTIGATION REVEALED THE MAIN ROTOR DRIVE TRAIN TORSIONAL COUPLING HAD FAILED.

Quoted verbatim from the NTSB record.