Serious incident to the Cabri G2 registered SP-NGU on 14/10/2020 at Deblin

Preliminary data based on the notification from the Polish authorities:

Prior to autorotation imitation the instructor opened the left door. During autorotation imitation the door was torn off from the helicopter. The helicopter landed on a grass airstrip without further irregularities.

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General information
Local date	14/10/2020
Responsible entity	Poland - AIB
State or area of occurrence	Poland
Location	AD Deblin (Poland)
Human consequences	None
Aircraft consequences	Minor
Occurrence class	Serious incident
File number	BEA2020-0465

Flight Information
Aircraft category	Helicopter - Small helicopter
Operator	Poland - Other (Akademickie Centrum Szkolenia Lotniczego)
Manufacturer / Model	GUIMBAL - CABRI
Aircraft Registration	SP-NGU
State of registry	Poland
Last departure point	Poland - EPDE : Deblin
Planned destination	Poland - EPDE : Deblin
Flight phase	Manoeuvring
Serial number	1055
Operator Type AG	Flying club/school
Operation Type	Non-Commercial Operations - Flight Training/Instructional - Dual

BEA is the French air safety investigation authority for civil aviation. The sole objective of the investigation is to improve air safety. It is intended neither to apportion blame nor to assess responsiblity.