ASN Wikibase Occurrence # 366297
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| Date: | Saturday 25 August 1990 |
| Time: | 19:40 LT |
| Type: |  Bell 47G-2 |
| Owner/operator: | Northland Helicopters, Inc. |
| Registration: | N90529 |
| MSN: | NT1958-1 |
| Year of manufacture: | 1974 |
| Total airframe hrs: | 1061 hours |
| Engine model: | LYCOMING VO-435-A1F |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Wall Lake, IA -
 United States of America
|
| Phase: | Take off |
| Nature: | Agricultural |
| Departure airport: | (NONE) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
AFTER REFUELING & RELOADING THE HELICOPTER WITH A SPRAY SOLUTION AT A FIELD SITE, A TAKEOFF WAS INITIATED IN CALM WIND CONDITIONS. THE PLT RPRTD THAT THE LOCATION REQUIRED HIM TO TAKE OFF UPSLOPE. HE STATED THAT THE RPM DROPPED SLIGHTLY, BUT REMAINED IN THE GREEN ARC DURING THE UPSLOPE PORTION OF THE TAKEOFF. AS THE HELICOPTER CROSSED A FENCE & THE TERRAIN STARTED SLOPING DOWNHILL, THE HELICOPTER FLEW OUT OF GROUND EFFECT. THE PLT RPRTD HE LEVELED THE HELICOPTER, THEN BEGAN A SLIGHT DSCNT TO INCREASE RPM & AIRSPEED. HOWEVER, THE ROTOR RPM DECAYED & JUST BEFORE TOUCHDOWN, THE HELICOPTER YAWED 90 DEG TO THE RIGHT. AFTER TOUCHDOWN, THE HELICOPTER ROLLED OVER. DENSITY ALT WAS ESTD TO BE 3216 FT.
Probable Cause: THE FAILURE OF THE PILOT TO MAINTAIN ROTOR RPM DURING TAKEOFF. THE HIGH DENSITY ALTITUDE AND UPHILL TERRAIN WERE FACTORS.
Accident investigation:
 |
|
Sources:
NTSB CHI90DCD02
History of this aircraft
Other occurrences involving this aircraft
| 17 March 1976 | N90529 | Private | 0 | Dows, Ia | |
w/o |
| 30 July 1998 | N90529 | Northland Helicopters, Inc. | 0 | Plainview, MN | |
sub |
| 15 June 2017 | N90529 | Scotts Helicopter Service Inc. | 0 | Marshan Township, near Hastings, Dakota County, MN | |
sub |
| Loss of control | ||||||
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 20-Mar-2024 19:32 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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