ASN Wikibase Occurrence # 226471
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Date: | Tuesday 4 June 2019 |
Time: | 07:19 LT |
Type: | Boeing/Aurora Flight Sciences Pegasus |
Owner/operator: | Aurora Flight Sciences |
Registration: | N83AU |
MSN: | AU-083 |
Engine model: | Magicall |
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) |
Destination airport: | Manassas Regional-Harry P. Davis Field, VA (MNZ/KHEF) |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative: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.
Accident investigation:
|
| |
Investigating agency: | NTSB |
Report number: | DCA19LA154 |
Status: | Investigation completed |
Duration: | |
Download report: | Final report |
|
Sources:
FAA register:
https://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=83AU NTSB DCA19LA154
Location
Media:
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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