Collision of Two Yak 52 Aircraft at Virginia Aerodrome (ZU-CWL and ZU-WAN)

Incident Overview and Location On 22 April 2007, at 1227Z, a collision occurred between two Yak 52 aircraft at Virginia Aerodrome (FAVG). The accident site was located at the holding point of Runway 23. The incident involved aircraft registered as ZU-WAN and ZU-CWL, both of which were privately operated and first registered in South Africa in 2003. The pilot of ZU-WAN was the owner of the aircraft, while ZU-CWL was owned by Delport JH. Both aircraft were South African registered and were involved in aerobatic training activities at the time of the incident. The weather conditions at the time were reported as wind from 210° at 8 knots, a temperature of 25°C, and visibility of CAVOK (Ceiling And Visibility OK). No cloud cover was present, and the dew point was unknown. The aerodrome is located at coordinates S29° 46’15.0 E031° 03’37.0, with an elevation of 20 feet. The runway used was 23, which is asphalt-surfaced and measures 930 x 34 metres. No approach facilities were available at the aerodrome. Both aircraft were in radio contact with Virginia Tower on VHF frequency 120.6 MHz during the incident. Neither aircraft was fitted with a flight data recorder (FDR) or a cockpit voice recorder (CVR), as these were not required under the Civil Aviation Regulations 1997. The investigation was conducted in accordance with Regulation 12.03.1 of the Civil Aviation Regulations (1997), with the purpose of promoting aviation safety and reducing the risk of accidents or incidents, rather than establishing legal liability. The report was released on 23 February 2006, although the accident occurred on 22 April 2007, which may indicate a typographical error in the source document. The IARC date was 23 October 2007. The investigation was conducted by the Civil Aviation Authority (CAA) of South Africa, and the report is designated as CA 12-12a. The CAA conducted an audit on the Aircraft Maintenance Organisation (AMO) that certified the last annual inspection on both aircraft prior to the accident on 26 May 2006, and no major findings were raised. The AMO held a valid approval No. 932 with an expiry date of 8 June 2007. The investigation focused on the circumstances leading to the collision, the condition of the aircraft, and the actions of the pilots involved. The report includes detailed information on the history of flight, injuries to persons, damage to aircraft, personnel information, aircraft information, meteorological information, aids to navigation, communications, aerodrome information, flight recorders, wreckage and impact information, medical and pathological information, fire, survival aspects, tests and research, organisational and management information, and additional information. The analysis section of the report examines the brake system of the Yak 52 aircraft, the possible reasons for the loss of braking, and the experience of the pilot of ZU-WAN. The conclusion section summarizes the findings of the investigation, including the validity of the pilots' licences and ratings, the condition of the aircraft, and the probable cause of the accident. The report also includes a disclaimer stating that it is given without prejudice to the rights of the CAA, which are reserved. The investigation was conducted in the interest of promoting aviation safety and reducing the risk of aviation accidents or incidents, and not to establish legal liability. The report is intended to provide a factual account of the accident and to identify any safety issues that may have contributed to the incident. The findings of the investigation may be used to inform future safety measures and to improve the overall safety of aviation operations. The report is a valuable resource for aviation professionals, safety regulators, and researchers interested in understanding the causes and consequences of aviation accidents. The detailed information provided in the report can help to identify areas for improvement in aircraft design, maintenance, pilot training, and operational procedures. The report also highlights the importance of proper maintenance and inspection of aircraft systems, as well as the need for pilots to be familiar with the specific characteristics and limitations of the aircraft they are operating. The investigation of this accident may contribute to the development of new safety standards and regulations, and to the improvement of existing ones. The report is a testament to the commitment of the CAA to ensuring the safety of aviation operations in South Africa, and to the importance of learning from past accidents to prevent future ones. The detailed analysis of the brake system and the possible reasons for the loss of braking provides valuable insights into the design and operation of pneumatic brake systems in aircraft. The report also highlights the importance of proper pilot training and experience, as well as the need for pilots to be familiar with the specific procedures and limitations of the aircraft they are operating. The findings of the investigation may be used to inform future safety measures and to improve the overall safety of aviation operations. The report is a valuable resource for aviation professionals, safety regulators, and researchers interested in understanding the causes and consequences of aviation accidents. The detailed information provided in the report can help to identify areas for improvement in aircraft design, maintenance, pilot training, and operational procedures. The report also highlights the importance of proper maintenance and inspection of aircraft systems, as well as the need for pilots to be familiar with the specific characteristics and limitations of the aircraft they are operating. The investigation of this accident may contribute to the development of new safety standards and regulations, and to the improvement of existing ones. The report is a testament to the commitment of the CAA to ensuring the safety of aviation operations in South Africa, and to the importance of learning from past accidents to prevent future ones.