ASN Wikibase Occurrence # 354018
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| Date: | Friday 31 July 1998 |
| Time: | 19:30 LT |
| Type: | Bell M74L |
| Owner/operator: | Northland Helicopters, Inc. |
| Registration: | N1001N |
| MSN: | 81-037 |
| Total airframe hrs: | 3766 hours |
| Engine model: | Lycoming VO-435 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Grand Forks, ND -
 United States of America
|
| Phase: | Approach |
| Nature: | Agricultural |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot refilled the hopper and was in the middle of a swath run when the engine rpm increased and the main rotor rpm decreased. The helicopter impacted the terrain during the forced landing and rolled over. A teardown of the transmission was performed. The inspection revealed that the clutch shoes were worn to the point that there was metal to metal contacted between the clutch shoe and the drum.
Probable Cause: The worn rotor clutch shoes, and subsequent loss of main rotor rpm.
Accident investigation:
 |
|
Sources:
NTSB CHI98LA292
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 10-Mar-2024 17:57 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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