ASN Wikibase Occurrence # 356510
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| Date: | Monday 4 November 1996 |
| Time: | 09:23 LT |
| Type: |  Hughes 369F |
| Owner/operator: | McDonnell Douglas |
| Registration: | N630N |
| MSN: | 0004F |
| Year of manufacture: | 1984 |
| Total airframe hrs: | 1961 hours |
| Engine model: | Allison 250-C47M |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Flagstaff, AZ -
 United States of America
|
| Phase: | Landing |
| Nature: | Unknown |
| Departure airport: | (KFLG) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The test pilot made a successful preplanned autorotation to a runway in the test helicopter for certification purposes. The aircraft was operated at a designed maximum gross weight to establish a height velocity curve for future operations in high density altitudes. During the ground slide, the main rotor blades contacted and severed the tail boom. Various combinations of engineering design and the 'blowback' phenomena allowed the retreating main rotor blades to tilt downward and contact the tail boom.
Probable Cause: An uncommanded main rotor blade to tail boom contact due to a 'blowback' phenomena after a successful preplanned autorotation by the pilot to a high density altitude airport with a test aircraft designed at a maximum gross weight.
Accident investigation:
 |
|
Sources:
NTSB LAX97LA034
History of this aircraft
Other occurrences involving this aircraft
| 21 November 1996 | N630N | McDonnell Douglas | 0 | Flagstaff, AZ | |
sub |
| 12 February 2004 | N630N | MD Helicopters, Inc. | 0 | Mesa, AZ | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Mar-2024 08:00 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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