ANALYSIS OF GENERAL AVIATION FIXED-WING AIRCRAFT ACCIDENTS INVOLVING INFLIGHT LOSS OF CONTROL USING A STATE-BASED APPROACH

Inflight loss of control (LOC-I) is a significant cause of General Aviation (GA) fixed-wing aircraft accidents. The United States National Transportation Safety Board’s database provides a rich source of accident data, but conventional analyses of the database yield limited insights to LOC-I. We investigate the causes of 5,726 LOC-I fixed‑wing GA aircraft accidents in the United States in 1999–2008 and 2009–2017 using a state-based modeling approach. The multi-year analysis helps discern changes in causation trends over the last two decades. Our analysis highlights LOC-I causes such as pilot actions and mechanical issues that were not discernible in previous research efforts. The logic rules in the state-based approach help infer missing information from the National Transportation Safety Board (NTSB) accident reports. We inferred that 4.84% (1999–2008) and 7.46% (2009–2017) of LOC-I accidents involved a preflight hazardous aircraft condition. We also inferred that 20.11% (1999–2008) and 19.59% (2009–2017) of LOC-I accidents happened because the aircraft hit an object or terrain. By removing redundant coding and identifying when codes are missing, the state-based approach potentially provides a more consistent way of coding accidents compared to the current coding system.

Now you see it, now you don’t: dynamism amplifies the typicality effect

Some safety events do not stabilise in a coherent state, presenting with transient or intermittent features. Such dynamism may pose problems for human performance, especially if combined with non-typical stimuli that are rarely encountered in everyday work. This may explain undesirable pilot behaviour and could be an important cognitive factor in recent aircraft accidents. Sixty-five airline pilots tested a real-world typicality gradient, composed of two cockpit events, a typical event, and a non-typical event, across two different forms of dynamism, a stable, single system transition, and an unstable, intermittent system transition. We found that non-typical event stimuli elicited a greater number of response errors and incurred an increased response latency when compared to typical event stimuli, replicating the typicality effect. These performance deteriorations were amplified when a form of unstable system dynamism was introduced. Typical stimuli were unaffected by dynamism. This indicates that dynamic, non-typical events are problematic for pilots and may lead to poor event recognition and response. Typical is advantageous, even if dynamic. Manufacturers and airlines should evolve pilot training and crew procedures to take account of variety in event dynamics.

Aviation Safety in South Sudan

Africa contributes only 3.9% in air traffic, but records 19% of aviation accidents, in terms of fatalities. High accident rates are attributed to poor compliance with International Civil Aviation Organization (ICAO) Standards and Recommended Practices (SARPs). This study analyzed the prevalence of aircraft accidents in the youngest African country, South Sudan, which obtained independence in July 9, 2011. The quantitative study examined aviation accident databases to determine the number of aircraft accidents in South Sudan, the aircraft manufacturers and aircraft models, number of fatalities, and causes of accidents, categorized as pilot error, technical failure, air traffic control, or weather-related events. The accidents were collected from the Aviation Safety Network (ASN) database, which is maintained by the Flight Safety Foundation. A total of 83 accident cases were examined, with 32 satisfying the criteria of accidents covering the July 2011 to May 2021 period. The findings show that Antonov aircrafts account for a majority of the accidents (31.25%), followed by Cessna (21.88%) and LET (15.63%). The 32 aircrafts involved in the accidents were carrying 378 occupants, 72 occupants died, representing a fatality rate of 19.5%. Antonov (66.67%) and LET (27.7%) contributed the greatest fatalities. In terms of accident causes, technical failures (46.9%) and pilot errors (43.8%) were the most dominant causes. Weather-related conditions only contributed to 9.4% of all the cases investigated. These results show that South Sudan continues to suffer from poor aviation infrastructure, poor compliance to internationally recognized SARPs.

Reporting and Investigation of Unmanned Aircraft Systems (UAS) Accidents and Serious Incidents. Regulatory Perspective

Naturally, the ever-growing number of drone operations conducted worldwide carries with it an increase in the number of safety-related incidents and occurrences. The reporting and subsequent investigation of unmanned aircraft system (UAS) accidents and serious incidents seems like a proven solution towards improving operational safety. Such procedures also stem from the fact that UAS are of recognized as aircraft – and aircraft accidents and serious incidents are subject to obligatory investigation. From a technical perspective, a key issue concerns discrepancies in the investigation process as there are significant differences between manned and unmanned aviation operations. From a regulatory perspective, one key question is to what extent should it be obligatory to conduct independent technical investigation of occurrences involving UAS? Such occurrences are not only accidents and serious incidents that involve both UAS and manned aircraft, where “traditional” rules of conducting a full and independent technical investigation apply – the majority occurrences involve only UAS that were either destroyed, damaged or acted as a hazard to third parties. The method of study comprised of content analysis of existing legislation. Current doctrines were confronted with existing regulations, documents, materials, safety reports and statistics. Results of the study shows that the extension of regulations created for manned aviation accident reporting and investigation may not be enough, and certain improvements are necessary, e.g. to standardize the reporting of occurrences and the criteria to conduct a formal accidents and serious incidents investigation. It is also reasonable to take actions aimed at raising awareness among UAS users of the need to report accidents and serious incidents, as well as engage them in the investigative process. The lack of standardization in this field has resulted in the lack of data that is “good enough” to indicate the main causes and factors that contribute to UAS accidents.

Factors Contributing to Accidents During Aerobatic Flight Operations

INTRODUCTION: Aerobatic flight operations involve a higher level of risk than standard flight operations. Aerobatics imposes considerable stresses on both the aircraft and the pilot. The purpose of this study was to analyze civilian aerobatic aircraft accidents in Australia, with particular emphasis on the underlying accident causes and survival outcomes.METHODS: The accident and incident database of the Australian Transport Safety Bureau was searched for all events involving aerobatic flight for the period 19802010.RESULTS: A total of 51 accidents involving aircraft undertaking aerobatic operations were identified, with 71 aircraft occupants. Of the accidents, 27 (52.9) were fatal, resulting in a total of 36 fatalities. There were 24 nonfatal accidents. In terms of injury outcomes, there were 4 serious and 9 minor injuries, and 22 accidents in which no injuries were recorded. Fatal accidents were mainly due to loss of control by the pilot (44.4), in-flight structural failure of the airframe (25.9), and terrain impact (25.9). G-LOC was considered a possible cause in 11.1 of fatal accidents. Nonfatal accidents were mainly due to powerplant failure (41.7) and noncatastrophic airframe damage (25). Accidents involving aerobatic maneuvering have a significantly increased risk of a fatal outcome (odds ratio 26).DISCUSSION: The results of this study highlight the risks involved in aerobatic flight. Exceeding the operational limits of the maneuver and the design limits of the aircraft are major factors contributing to a fatal aerobatic aircraft accident. Improved awareness of G physiology and better operational decision-making while undertaking aerobatic flight may help prevent further accidents.Newman DG. Factors contributing to accidents during aerobatic flight operations. Aerosp Med Hum Perform. 2021; 92(8):612618.

A MILESTONE TO ENHANCE RUNWAY SAFETY: THE NEW GLOBAL REPORTING FORMAT

Runway excursion continues to cause serious deaths and economic losses in aviation. 179 people died in the accidents occurring between 2010 and 2019. The direct cost of accidents in 2019 is estimated at over $4 billion. A new method known as Global Reporting Format (GRF) is introduced after studies carried out by the International Civil Aviation Organization (ICAO) to prevent aircraft accidents caused by runway excursion and to minimize risks associated with it. GRF is considered an important milestone to flight safety by ICAO. In this study, GRF is explained with all its components, and benefits and transition to the application process are discussed. As a result of the study, it is assessed that GRF is a positive contribution to flight safety in the process of take-off or landing by matching information about runway surface conditions obtained to the flight crews especially in adverse conditions.

Responsibility of Airlines Company to the Passenger After The Ratification of the Montreal Convention 1999 by Indonesia

Aviation is a strategic business owned by a country, whether managed by a state company or a private company. In Indonesia, airplanes are the most important transportation. It is said to be able to connect every city, province, and inter-island very quickly compared to land and sea transportation. The importance of air transportation must be accompanied by regulations that guarantee the safety and security of airlines and passengers who are users of air transportation services. The security and safety are regulated through national and international rules which must be followed by every airline and passenger for the creation of good aviation business. The main problem in the aviation business is aircraft accidents which result in aircraft destruction and death to all passengers and crew members. This cannot be avoided because the cause of the accident could be from aircraft engine damage, weather, or error from the pilot. This aircraft accident not only damage airlines that have planes worth billions of rupiah but can damage passengers and heirs. Due to the risks involved in the aviation business. Although it is said that air transportation is very safe because the technology used by aircraft is the latest, accidents can not be avoided if it occurs.

Need for Aerospace Structural Health Monitoring

Aircraft accidents involving catastrophic fatigue failure have the potential for significant loss of life. The aim of this research was to investigate trends in aircraft fatigue failure accidents to inform aerospace Structural Health Monitoring (SHM) system Research and Development (R&D). The research involved collecting 139 aircraft fatigue failure accident reports from the Aviation Safety Network database, which were coded using a directed content analysis. The trends and features of the categorical data were then explored using an ex-post facto study. The results showed that fatigue failure accidents have increased at a rate of (3.4 ± 0.6)×10-2 per year since the 1920’s. Over the period of the study there were 2098 fatalities in 57 fatal accidents, giving (15.1 ± 1.6) fatalities per accident and a fatal accident percentage of (45 ± 10)%. The data indicates that engine failures combined with smaller aircraft and operators should be the focus of SHM R&D. While there is a desire to further improve safety for large transport category aircraft, results indicate that smaller aircraft and operators have seen a relative increase in fatigue failure accidents, and hence are also in need of SHM systems. Engine and undercarriage systems have the greatest number of fatigue failure accidents associated with them, suggesting these should be the focus of SHM R&D.