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ASN Wikibase Occurrence # 228243
Last updated: 15 August 2019
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Date:09-JAN-2019
Time:08:13
Type:Insitu ScanEagle X200
Owner/operator:Insitu Pacific
Registration: AV616
C/n / msn: 08-616
Fatalities:Fatalities: 0 / Occupants: 0
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:near Woleebee Creek -   Australia
Phase: En route
Nature:Survey
Departure airport:Woleebee Creek area
Destination airport:Woleebee Creek area
Investigating agency: ATSB
Narrative:
At about 0825 Eastern Standard Time on 9 January 2019, an Insitu ScanEagle X200 (X200) unmanned aircraft system was launched to conduct ‘beyond visual line of sight’ aerial survey work in the Woleebee Creek area of Queensland. The flight crew consisted of two pilots and two ground crew.
Shortly after launch, one of the ground crew observed the X200 pitch up and then enter an aerodynamic stall. The flying pilot commenced the emergency procedures for a stall-spin, however the X200 self-recovered before the checklist was completed. At about the same time the pilots received an alert indicating an airspeed sensor failure and initiated the associated emergency procedure checklist.
Before visual sight was lost, the ground crew observed the X200 oscillating in pitch as it continued to fly to the programmed first waypoint. While the flying pilot was executing the emergency procedures checklist, the X200 entered a second aerodynamic stall. Following self‑recovery from a low height above terrain, the X200 commenced a climbing orbit. Shortly after, the X200 entered a third aerodynamic stall, this time from a height that was insufficient for recovery, and collided with terrain. There was no post-impact fire and the X200 was destroyed. There were no reported injuries to people or damage to infrastructure.

The investigation found that the blockage in the pitot-static system resulted in unreliable airspeed data being supplied to the autopilot. Unreliable airspeed data led to the X200 entering an aerodynamic stall at a height that was insufficient for recovery.
During the pre-flight checks, there were opportunities for the erroneous airspeed indications to be identified. However, they were not recognised by the crew or flagged by the ground control station.

Sources:

https://www.atsb.gov.au/publications/investigation_reports/2019/aair/ao-2019-004/

Accident investigation:
cover
  
Investigating agency: ATSB
Status: Investigation completed
Duration: 7 months
Download report: Final report


Revision history:

Date/timeContributorUpdates
15-Aug-2019 18:56 harro Added

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