ASN Wikibase Occurrence # 133851
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| Date: | Tuesday 28 May 1996 |
| Time: | 07:11 LT |
| Type: |  McDonnell Douglas MD 600N |
| Owner/operator: | Mcdonnell Douglas Helicopter |
| Registration: | N600RN |
| MSN: | RN001 |
| Year of manufacture: | 1994 |
| Total airframe hrs: | 39 hours |
| Engine model: | Allison 250-C47 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Thermal, CA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | , CA (KTRM) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The flight was part of an engineering test flight series to complete the Part 27 certification for a new rotorcraft. The specific test point was part of a flight strain survey and involved cyclic control reversals. The pilot had set the parameters and executed the cyclic control inputs as planned. Almost simultaneous with the aft movement of the cyclic there was a loud noise and immediate vibrations in the aircraft and the controls. A pilot in the chase aircraft informed the pilot that a main rotor blade had struck and severed the tail boom. A power off autorotation was accomplished without the tail rotor system. The resultant hard landing was onto a pile of dry brush which was ignited by the hot engine exhaust. The brush fire destroyed the aircraft.
Probable Cause: inadequate design of the stress limits for cyclic control of the helicopter.
Accident investigation:
 |
|
Sources:
NTSB LAX96LA207
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Feb-2013 06:42 | TB | Updated [Aircraft type, Operator, Narrative] |
| 27-Feb-2013 07:59 | TB | Updated [Time, Aircraft type, Operator, Nature, Departure airport, Source] |
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 09-Apr-2024 06:45 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Nature, Departure airport, Source, Narrative, Category, Accident report] |
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