ASN Wikibase Occurrence # 368195
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| Date: | Monday 14 August 1989 |
| Time: | 19:07 LT |
| Type: |  Bell 47G-2A-1 |
| Owner/operator: | W.e. Mcdermott |
| Registration: | N49HB |
| MSN: | 3562 |
| Total airframe hrs: | 8463 hours |
| Engine model: | LYCOMING VO-435-A1F |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Wisconsin Dells, WI -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Unknown |
| Departure airport: | Wisconsin Dells, WI |
| (WS07) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE ACCIDENT HELICOPTER, OPERATING AS AN AERIAL SIGHT-SEEING CONCESSION, FAILED TO SUSTAIN FLIGHT AND LANDED HARD AFTER ATTEMPTING A DOWNWIND TAKEOFF FROM A RAISED HELIPAD (PINNACLE). THE INVESTIGATION SHOWED THAT THE HELICOPTER WAS TOO HEAVILY LOADED TO HOVER OUT OF GROUND EFFECT AT THE DENSITY ATTITUDE (2500 FEET) OF THE ACCIDENT SITE AND THE CENTER OF GRAVITY WAS OUTSIDE OF THE ALLOWABLE RANGE. THE PILOT STATED DURING AN INTERVIEW THAT HE PERCEIVED A POWER LOSS AFTER CLEARING THE PINNACLE AND WAS UNABLE TO MAINTAIN ROTOR RPM WITH THE THROTTLE FULL OPEN. POST ACCIDENT INSPECTION OF THE HELICOPTER SHOWED NO DEFECTS IN THE AIRFRAME OR POWERPLANT. ACCORDING TO WITNESSES AT THE SCENE THE ACCIDENT, THE HELICOPTER TOOK OFF FROM THE PINNACLE IN A GENERALLY EASTERLY DIRECTION. WHEN THE PILOT WAS ASKED ABOUT THE WINDS AT THE TIME OF THE TAKEOFF, HE DESCRIBED THEM AS WESTERLY AT APPROXIMATELY 6 TO 8 KNOTS.
Probable Cause: ATTEMPT BY THE PILOT TO EXCEED THE HOVER PERFORMANCE CAPABILITIES OF THE HELICOPTER, AND OPERATING OUTSIDE THE WEIGHT AND BALANCE LIMITATIONS. THE PILOT'S OVERCONFIDENCE IN THE HELICOPTER'S ABILITY AND HIS SUBSEQUENT FAILURE TO ADEQUATELY PREPARE AND PLAN PROPERLY FOR THE ACCIDENT FLIGHT ARE FACTORS.
Accident investigation:
 |
|
Sources:
NTSB CHI89FA165
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 23-Mar-2024 08:09 | ASN Update Bot | Added |
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