Continental Copters MK6B N9080T

Summary

On 1 June 1988 at about 23:00 local time, a Continental Copters MK6B registered N9080T was involved in an accident near Callahan, Florida, United States. One person was on board and nobody was injured. The aircraft was substantially damaged. No probable cause statement is available for this record.

Date

1 June 1988 at 23:00

Classification

Accident

Location

Callahan, Florida, United States

Coordinates

30.5602, -81.8309

Aircraft

Continental Copters MK6B

Registration

N9080T

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

MIA88LA186

Nobody was 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

WHILE MANEUVERING THE HELICOPTER DURING AN AERIAL APPLICATION FLT THE ENG QUIT. DURING THE AUTOROTATIVE LANDING THE HELICOPTER LANDED HARD. EXAMINATION OF THE ENG REVEALED THE ACCESSORY DRIVE GEAR, WHICH IS ATTACHED TO THE CRANKSHAFT BY 6 AN-4A BOLTS WITH THE TORQUE TRANSMITTED TO THE GEAR THROUGH 3 PRESS-FIT DOWEL PINS, SEPARATED WHEN THE BOLTS FAILED DUE TO FATIGUE, RESULTING IN THE TOTAL LOSS OF ENG POWER. THERE WAS NO EVIDENCE THAT THE DOWEL PINS WERE INSTALLED. ACCORDING TO THE ENG MANUFACTURER, THE DOWEL PINS ARE THE PRINCIPAL TORQUE CARRYING MECHANISM OF THE ACCESSORY DRIVE GEAR.

Quoted verbatim from the NTSB record.