ASN Wikibase Occurrence # 371003
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| Date: | Wednesday 1 June 1988 |
| Time: | 20:00 LT |
| Type: | Continental Copters El Tomcat Mk 6B |
| Owner/operator: | Private |
| Registration: | N9080T |
| MSN: | CCI-76-4 |
| Total airframe hrs: | 5500 hours |
| Engine model: | LYCOMING VO-435-B1A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Callahan, FL -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
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.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB MIA88LA186
History of this aircraft
Other occurrences involving this aircraft
| 15 October 1982 | N9080T | Walter M. Moore | 0 | Cope, SC | |
w/o |
| 9 July 2003 | N9080T | 0 | Fort Yates, ND | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 25-Mar-2024 17:02 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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