ASN Wikibase Occurrence # 384940
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| Date: | Monday 1 March 1982 |
| Time: | 09:30 LT |
| Type: |  Bell 206B III |
| Owner/operator: | Public Service Co. Of Co. |
| Registration: | N580P |
| MSN: | 2694 |
| Year of manufacture: | 1979 |
| Total airframe hrs: | 1789 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Alma, CO -
 United States of America
|
| Phase: | En route |
| Nature: | Executive |
| Departure airport: | Denver, CO |
| Leadville, CO | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT REPORTED THAT BEFORE THE ACCIDENT, THE FLIGHT HAD BEEN UNEVENTFUL AND ALL INSTRUMENTS WERE READING NORMAL EXCEPT THE TOT GAUGE. REPORTEDLY, IT WAS INDICATING 750 DEGREES, WHICH WAS ABOUT 100 DEGREES HIGHER THAN NORMAL FOR HIS POWER SETTING OF 70% TORQUE. HE STATED HE WAS FLYING AT 70 KNOTS WHEN THE HELICOPTER STARTED LOOSING RPM. THE PASSENGER STATED THAT THEY WERE ABOUT 200 TO 300 FT ABOVE A RIDGE AS THEY WERE FLYING SOUTHWEST. THE PASSENGER REPORTED THAT AFTER THEY CROSSED THE RIDGE, THE HELICOPTER BEGAN LOSING ALTITUDE FAST. ACCORDING TO THE PILOT, THEY WERE COMING UP ON A RIDGE LINE, WHEN THE RPM BEGAN DROPPING; HOWEVER, HE WAS UNABLE TO DECELERATE ENOUGH TO LAND ON TOP OF THE RIDGE. THE HELICOPTER CAME IN CONTACT WITH THE GROUND ON THE SOUTH-SOUTHWEST SIDE OF THE RIDGE LINE AND CRASHED. EXAMINATION OF THE ENGINE REVEALED THE AIR BLEED VALVE WAS DIRTY AND HAD A HOLE IN THE DIAPHRAGM. IN THIS CONDITION, THE VALVE WOULD CLOSE LATE. THE ELEVATION WAS ABOUT 12,000 FT MSL, WIND GUSTING 30 KNOTS.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB DEN82DA037
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 03-Apr-2024 16:26 | ASN Update Bot | Added |
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