ASN Wikibase Occurrence # 72164
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Date: | Saturday 29 February 1992 |
Time: | 12:22 LT |
Type: | Enstrom TH-28 (480) |
Owner/operator: | Enstrom Helicopter Corporation |
Registration: | N8631E |
MSN: | 3003 |
Total airframe hrs: | 575 hours |
Engine model: | ALLISON 250-C20W |
Fatalities: | Fatalities: 0 / Occupants: 1 |
Aircraft damage: | Substantial |
Category: | Accident |
Location: | Leadville, CO -
United States of America
|
Phase: | Unknown |
Nature: | Unknown |
Departure airport: | |
Destination airport: | |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:THIS WAS ONE OF A SERIES OF EXPERIMENTAL TEST FLIGHTS LEADING TOWARDS FAA CERTIFICATION OF THE MODIFIED HELICOPTER. DATA POINTS FOR THE HEIGHT VELOCITY CURVE HAD BEEN COLLECTED AND THE PILOT WAS ATTEMPTING TO CONFIRM THEIR ACCURACY. AT 46 KNOTS AND 400 FEET AGL, THE PILOT MADE AN INTENTIONAL AUTOROTATION. HE SAID THE SINK RATE WAS HIGHER THAN PREVIOUSLY NOTED, AND HEAVY ROTOR BLADE STALL MADE THE FLARE INEFFECTIVE. THE PILOT SAID A DOWNDRAFT MAY HAVE PRECIPITATED THE ACCIDENT.
Probable Cause: THE PILOT MISJUDGING THE DESCENT RATE AND CONSEQUENTLY DELAYING THE FLARE. A FACTOR WAS: DOWNDRAFT.
Accident investigation:
|
| |
Investigating agency: | NTSB |
Report number: | DEN92LA036 |
Status: | Investigation completed |
Duration: | 1 year and 4 months |
Download report: | Final report |
|
Sources:
NTSB DEN92LA036
Location
Revision history:
Date/time | Contributor | Updates |
01-Feb-2010 10:21 |
Alpine Flight |
Added |
27-Apr-2013 18:49 |
TB |
Updated [Date, Time, Aircraft type, Registration, Cn, Operator, Total occupants, Location, Nature, Source, Damage, Narrative] |
21-Dec-2016 19:25 |
ASN Update Bot |
Updated [Time, Damage, Category, Investigating agency] |
11-Apr-2024 08:43 |
ASN Update Bot |
Updated [Time, Operator, Other fatalities, Nature, Source, Narrative, Category, Accident report] |
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