ASN Wikibase Occurrence # 359712
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| Date: | Monday 3 October 1994 |
| Time: | 16:20 LT |
| Type: |  Bell 47G2 |
| Owner/operator: | Fostaire Helicopters |
| Registration: | N5193B |
| MSN: | 2174 |
| Year of manufacture: | 1958 |
| Total airframe hrs: | 6413 hours |
| Engine model: | LYCOMING VO-435-A1F |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Decatur, IL -
 United States of America
|
| Phase: | En route |
| Nature: | Survey |
| Departure airport: | , IL (KDEC) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT STATED THAT AFTER COMPLETING A LINE PATROL, HE MADE A CLIMBING LEFT TURN TO RETURN TO THE AIRPORT. AT APPROXIMATELY 50 TO 75 FEET ABOVE THE GROUND, THE PILOT HEARD A STRANGE SOUND, THE ENGINE BEGAN TO OVERSPEED, AND THE HELICOPTER BEGAN TO DESCEND. HE LOWERED THE COLLECTIVE AND PLACED THE HELICOPTER INTO AN AUTOROTATION TO MAKE A FORCED LANDING ON A ROAD. THE HELICOPTER TOUCHED DOWN HARD AND WAS DAMAGED. A POSTACCIDENT INVESTIGATION REVEALED 13 OF 32 ROLLER SPRINGS INSIDE THE FREEWHEELING UNIT OF THE TRANSMISSION WERE BROKEN CAUSING THE UNIT TO BECOME DISENGAGED.
Probable Cause: the failure of the roller springs in the freewheeling unit of the transmission which caused the unit to disengage.
Accident investigation:
 |
|
Sources:
NTSB CHI95LA003
History of this aircraft
Other occurrences involving this aircraft
| 4 September 1968 | N5193B | Van Nuys Helicopter | 2 | Hollywood, CA | |
w/o |
| 8 June 1970 | N5193B | Danbury Copter | 0 | Danbury, CT | |
sub |
| 25 September 2002 | N5193B | Ag Copters Inc. | 1 | Edmondson, AR | |
w/o |
| Collision with pole or wires | ||||||
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Mar-2024 13:49 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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