Accident Robinson R44 Raven II OO-RFF, Sunday 29 December 2019
ASN logo
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information. If you feel this information is incomplete or incorrect, you can submit corrected information.

Date:Sunday 29 December 2019
Type:Silhouette image of generic R44 model; specific model in this crash may look slightly different    
Robinson R44 Raven II
Registration: OO-RFF
MSN: 10691
Year of manufacture:2005
Fatalities:Fatalities: 0 / Occupants: 4
Other fatalities:0
Aircraft damage: Destroyed
Location:Wijnendale, West Flanders -   Belgium
Phase: Approach
Departure airport:Grobbendonk
Destination airport:Torhout
Investigating agency: AAIU Belgium
Confidence Rating: Accident investigation report completed and information captured
The helicopter was approaching its final destination, a restaurant close to the castle of Wijnendale. Suddenly, the “low rotor RPM” horn activated and the pilot proceed to an emergency landing. Upon landing, the skids sunk in the ground and the helicopter tilted over its nose and crash landed on its right-hand side. The occupants climbed out, uninjured. The helicopter was destroyed.

Findings as to causes and contributing factors
• The helicopter showed no technical anomaly and was working properly shortly before the accident.
• The pilot did not recognize and respond adequately to the low rotor RPM condition.
• The pilot was conditioned to land in autorotation when in doubt about the emergency.
• The helicopter did not regain rotor RPM during the descent.
• Shortly before landing, there was not enough energy in the rotor to cushion the landing.
• Upon landing, the helicopter’s skids sank into the mud and prevented the helicopter from sliding further causing the helicopter to stop abruptly and tilt forward until the main rotor hit the ground.
• The impact of the helicopter damaged the V-belt drive system
• The pilot was not properly trained in the recognition and recovery from a low rotor RPM condition.
• The pilot was not tested on his ability to recognize and recover from a low rotor RPM during his PPL skill test.
• The mandatory training elements as defined in the Operational Suitability Data (OSD) for R44 helicopters (RTR465) were not properly implemented

Accident investigation:
Investigating agency: AAIU Belgium
Report number: 
Status: Investigation completed
Download report: Final report



OO-RFF at Hoevenen (EBHN), August 2015. Photo (c): H.Ranter

Revision history:

30-Dec-2019 07:03 gerard57 Added
30-Dec-2019 07:34 RobertMB Updated [Aircraft type, Registration, Cn, Source]
30-Dec-2019 17:30 Anon. Updated [Departure airport]
03-Jun-2022 08:04 harro Updated [Location, Phase, Departure airport, Narrative, Accident report]
03-Jun-2022 08:07 harro Updated [Photo]
03-Jun-2022 08:14 harro Updated [Source, Damage]
09-Nov-2022 08:20 Ron Averes Updated [Location]
07-Nov-2023 13:10 Anon. Updated

Corrections or additions? ... Edit this accident description

The Aviation Safety Network is an exclusive service provided by:
Quick Links:

CONNECT WITH US: FSF on social media FSF Facebook FSF Twitter FSF Youtube FSF LinkedIn FSF Instagram

©2024 Flight Safety Foundation

1920 Ballenger Av, 4th Fl.
Alexandria, Virginia 22314