Accident Heli-Sport CH-77 Ranabot OK-WHA-84,
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ASN Wikibase Occurrence # 249242
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Date:Tuesday 30 March 2021
Type:Silhouette image of generic CH7 model; specific model in this crash may look slightly different    
Heli-Sport CH-77 Ranabot
Registration: OK-WHA-84
MSN: 055
Fatalities:Fatalities: 2 / Occupants: 2
Aircraft damage: Destroyed
Location:field near Dobřichovice, Prague-West region -   Czech Republic
Phase: Take off
Departure airport:Dobříchovice
Destination airport:
Investigating agency: UZPLN
Confidence Rating: Accident investigation report completed and information captured
Heli-Sport CH-77 Ranabot, registration OK-WHA-84, impacted field near Dobřichovice village. Two occupants were fatally injured.
The event took place on the afternoon of March 30 in the field near Dobřichovice. After a stopover and re-takeoff, the passenger's door remained ill-closed on the left side, which opened slightly during the flight. The critical situation occurred about 50 seconds after takeoff at an altitude of about 100 meters.
The pilot tried to close the door. He released the steering lever and leaned over the passenger to reach the doorknob. However, the lever moved spontaneously, but perhaps also under the pressure of the passenger's foot, to a lower position, which significantly reduced engine power and the helicopter went from ascent to descent.
The forward movement of the pilot's body affected the position of the center of gravity, at the same time, according to the report, the cyclic control lever was inadvertently pushed forward. These facts negatively affected the operation of the main rotor, which lost traction.
The helicopter tilted its bow to the ground and, on a steep descent, turned to the right about the longitudinal axis several times. The pilot apparently tried to select a steep descent, but could no longer prevent a crash.

Accident investigation:
Investigating agency: UZPLN
Report number: 
Status: Investigation completed
Duration: 1 year 1 month
Download report: Final report


Revision history:

30-Mar-2021 14:35 Ambi Added
30-Mar-2021 16:17 RobertMB Updated [Operator, Other fatalities, Plane category]
31-Mar-2021 09:38 DaShadow Updated [Source]
31-Mar-2021 09:39 harro Updated [Nature, Source]
31-Mar-2021 09:39 harro Updated [Plane category]
20-Apr-2022 10:39 Nepa Updated [Location, Phase, Nature, Departure airport, Source, Narrative, Operator]
02-May-2022 17:41 harro Updated [Cn, Accident report]

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