AAIB investigation to DJI Matrice 210, (UAS, registration n/a) 20 April 2019
Loss of control during hover checks, Dearne Old Moor, South Yorkshire, 20 April 2019.
Summary:
The DJI Matrice 210 small unmanned aircraft (SUA) was performing a daylight survey exercise in light winds. After the pre-flight checks were completed, the aircraft was ascended to a height of around 5 m (~15 ft) to perform further checks. The pilot commanded small control inputs after which the aircraft became unstable and one of the motor arms broke where it attached to the aircraft. The pilot lost control and the aircraft crashed into the ground. No person was injured.
Subsequent analysis of recorded data from the aircraft identified that the No 2 (front left) and No 3 (rear left) motors had stalled, leading to a loss of lift on the left side of the aircraft. It could not be established whether the motors stalled prior to or after the failure of the motor arm.
Refer to report on DJI Matrice 210 - EW/C2019/03/02 in this AAIB Bulletin 1/2020 for information on other accidents involving the DJI Matrice 210 and Safety Recommendations concerning the safe operation of a UAS near to people and congested areas.
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