Accident Robinson R22 Beta II HB-ZOF,
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ASN Wikibase Occurrence # 301160
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Date:Saturday 12 November 2022
Type:Silhouette image of generic R22 model; specific model in this crash may look slightly different    
Robinson R22 Beta II
Owner/operator:Valair AG
Registration: HB-ZOF
MSN: 4154
Year of manufacture:2007
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Location:Maienfeld, GR -   Switzerland
Phase: Landing
Departure airport:Balzers/Fl Heliport (LSXB)
Destination airport:Maienfeld
Investigating agency: STSB
Confidence Rating: Accident investigation report completed and information captured
The student pilot was trying to take off and land in mountainous areas near Maienfeld, Graubünden, at an elevation of 1880 m. The first two manoeuvres went well, but in the third, the student noticed a problem with the helicopter and passed the controls to the instructor.

However, the latter was unable to regain control of the aircraft, which fell back by rolling over to the ground before coming to rest.
Both were not injured.

The accident, in which a helicopter suffered a rotor speed drop during takeoff from an elevated landing site and subsequently collided with terrain, was due to the helicopter's power limits being exceeded, probably accentuated by a partially pulled carburetor preheating.
The following factors contributed to the accident:
- A failure to consistently check power reserves during hover;
- a questionable training facility;
- insufficient safety margins given the instructor's still limited experience in mountain flight training.

Accident investigation:
Investigating agency: STSB
Report number: 
Status: Investigation completed
Duration: 8 months
Download report: Final report


Revision history:

13-Nov-2022 20:34 Dupont Dédé Added
13-Nov-2022 20:35 harro Updated [Time, Aircraft type, Registration, Cn, Operator, Location, Departure airport, Narrative]
13-Nov-2022 21:26 RobertMB Updated [Aircraft type, Registration, Cn, Operator, Location, Departure airport, Source, Narrative]
13-Nov-2022 22:35 RobertMB Updated [Registration, Departure airport, Source, Damage, Narrative]
14-Nov-2022 12:54 Iceman 29 Updated [Embed code]
14-Nov-2022 14:05 RobertMB Updated [Source, Embed code]
20-Jul-2023 07:42 harro Updated [[Source, Embed code]]

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