ASN Wikibase Occurrence # 226471
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| Date: | 04-JUN-2019 |
| Time: | 07:19 LT |
| Type: | Boeing/Aurora Flight Sciences Pegasus |
| Owner/operator: | Aurora Flight Sciences |
| Registration: | N83AU |
| MSN: | AU-083 |
| Fatalities: | Fatalities: 0 / Occupants: 0 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Manassas Airport (KHEF) -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Test |
| Departure airport: | Manassas Regional-Harry P. Davis Field, VA (MNZ/KHEF) |
| Manassas Regional-Harry P. Davis Field, VA (MNZ/KHEF) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The aircraft experienced a vibrational excitation environment which exceeded the previously measured accelerations used to establish an autopilot ground-sensing threshold. The excessive oscillations activated the ground-sensing system, which transitioned the autopilot from Autoland into "ground" mode and commanded a reduction in rotor speed.
Probable Cause: a loss of hover lift thrust provided by the eight lift motors due to a false on-ground rotor speed reduction command, resulting from excessive vibration.
Sources:
FAA register: https://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=83AU
NTSB DCA19LA154
Accident investigation:
 |
|
Location
Media:
#NTSB: Aurora Pegasus Passenger Air Vehicle (PAV) N83AU #UAM #eVTOL: "...excessive oscillations activated the ground-sensing system, which transitioned the AP from Autoland to "ground" mode and commanded a reduction in rotor speed.
— Aerossurance (@Aerossurance) March 17, 2020
"https://t.co/qTIB4aFkdx#flightsafety pic.twitter.com/dWjK2jPBye
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 23-Jun-2019 14:11 | harro | Added |
| 17-Mar-2020 19:14 | Aerossurance | Updated [Time, Total occupants, Phase, Departure airport, Destination airport, Source, Embed code, Damage, Narrative] |
| 27-Mar-2021 20:30 | ASN Update Bot | Updated [Other fatalities, Source, Damage, Narrative, Plane category, Category, Accident report] |
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