ASN Wikibase Occurrence # 248715
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| Date: | Friday 29 November 2019 |
| Time: | 10:22 UTC |
| Type: | DJI Matrice 200 |
| Owner/operator: | Private |
| Registration: | Unregistered |
| MSN: | 0FZDF7U0P30222 |
| Fatalities: | Fatalities: 0 / Occupants: 0 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Montrose, Angus, Scotland -
 United Kingdom
|
| Phase: | En route |
| Nature: | Survey |
| Departure airport: | Montrose, Angus, Scotland |
| Montrose, Angus, Scotland | |
| Investigating agency: | AAIB |
| Confidence Rating: |  Accident investigation report completed and information captured |
AAIB investigation to DJI Matrice 200 V1, (UAS, registration n/a): Two occurrences of in-flight deployment of recovery parachute, near Raigmore Hospital, Inverness, 21 September 2019 and Montrose, Angus, 29 November 2019. The AAIB final reprot into the two incidents was punlished on 11 March 2021, and the following is the summary from it:
"The DJI Matrice 200 Unmanned Aircraft System (UAS) was being operated on an automated flight plan to conduct an aerial survey" [near Raigmore Hospital, Inverness, 21 September 2019]. "On the fifth flight of the day, while the aircraft was at a height of 100 m, the ballistic parachute recovery system fitted to the aircraft activated. The aircraft descended under the parachute and was subsequently found on the roof of a nearby house.
Two months later, after having been repaired and fitted with a new parachute system, the aircraft experienced a second parachute deployment. On that occasion the aircraft was being manually flown in GPS mode at a height of 92 m over an area of open ground" [at Montrose, Angus, 29 November 2019).
The first accident most likely occurred due to excessive vibration as a result of the parachute system not being securely attached to the airframe.
The investigation was unable to establish the cause of the second accident. There were several warnings in the recorded aircraft’s flight log, but analysis of this data did not provide any insight into why the flight was abruptly terminated. However, the parachute manufacturer considered that the second event involved a valid activation of the parachute system in response to a total aircraft power failure.
The investigation was limited by the availability of recorded flight data for the first accident and a lack of information from the UAS manufacturer. It was therefore unable to establish if there were any common factors between the two accidents, which involved the same aircraft but different parachute units. One Safety Recommendation is made regarding technical support to accident investigations by the UAS manufacturer.
In response to the first accident, the parachute manufacturer and the operator amended their respective procedures for securely attaching the parachute system to the aircraft.
The operator also identified that further emphasis on wind speed and direction was required prior to launch, to provide greater understanding of the drift potential in the case of a parachute deployment".
What is unusual about this report is that it covers two separate accidents at separate locations on separate dates to the same UAV. The UAV first crashed near Raigmore Hospital, Inverness, 21 September 2019, was repaired and crashed again at Montrose, Angus, 29 November 2019.
Accident investigation:
 |
|
Sources:
1. AAIB Final Report: https://assets.publishing.service.gov.uk/media/602be85ad3bf7f0316f8eff8/DJI_Matrice_200_V1_UAS_reg_na_03-21.pdf
2. https://www.strathspey-herald.co.uk/news/six-kilo-drone-fell-from-sky-near-raigmore-hospital-228935/
3. https://www.pressandjournal.co.uk/fp/news/inverness/2915854/investigation-concludes-after-drone-falls-from-330ft-over-highland-hospital/
4. https://www.inverness-courier.co.uk/news/six-kilo-drone-fell-from-sky-near-raigmore-hospital-228915/
5. https://en.wikipedia.org/wiki/Raigmore_Hospital
History of this aircraft
Other occurrences involving this aircraft
| 21 September 2019 | unreg. | Private | 0 | Raigmore Hospital, Old Perth Road, Inverness | |
sub |
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Mar-2021 19:08 | Dr. John Smith | Added |
| 11-Mar-2021 19:10 | Dr. John Smith | Updated [Narrative] |
| 12-Mar-2021 19:04 | harro | Updated [Accident report] |
| 01-Jul-2021 20:39 | Dr. John Smith | Updated [Source, Category] |
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