ASN Wikibase Occurrence # 360601
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| Date: | Friday 15 April 1994 |
| Time: | 17:10 LT |
| Type: |  Bell 206L-3 |
| Owner/operator: | Mtn States Tele & Telegraph |
| Registration: | N937S |
| MSN: | 51258 |
| Year of manufacture: | 1988 |
| Total airframe hrs: | 2537 hours |
| Engine model: | Allison250-C30P |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Englewood, CO -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
WHILE CONDUCTING A TEST FLIGHT FOLLOWING INSTALLATION OF A FUEL CONTROL/GOVERNOR, THE ENGINE ACCELERATED TO MAXIMUM POWER AND COULD NOT BE CONTROLLED BY THE PILOT. THE PILOT SECURED THE ENGINE AND CONDUCTED AN AUTOROTATION. DURING TOUCHDOWN, THE MAIN ROTOR BLADES CONTACTED THE TAIL BOOM AND SEVERED THE TAIL ROTOR DRIVE SHAFT. EXAMINATION OF THE FUEL CONTROL/GOVERNOR REVEALED A PIECE OF ABRASIVE PAPER IN THE RESET SHAFT HOUSING. ACCORDING TO THE EXAMINATION REPORT, THIS WOULD CAUSE LOSS OF GOVERNOR CONTROL TO THE HIGH SIDE.
Probable Cause: THE PILOT'S FAILURE TO MAINTAIN ROTOR RPM, HIS DELAYED FLARE, AND IMPROPER TOUCHDOWN. A FACTOR WAS A FAILURE OF THE FUEL CONTROL/GOVERNOR TO THE HIGH SIDE WHICH REQUIRED THE PILOT TO PERFORM A FULL AUTOROTATION.
Accident investigation:
 |
|
Sources:
NTSB FTW94LA124
History of this aircraft
Other occurrences involving this aircraft
| 18 April 2000 | N937S | Mountain States Telephone | 0 | LAKEWOOD, Colorado | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 16-Mar-2024 09:06 | ASN Update Bot | Added |
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