The hazard associated with the inability to separate aircraft that are below the appropriate lowest safe altitude at night was identified but not adequately mitigated. This resulted in a situation where, in the event of a simultaneous go-around at night during land and hold short operations at Melbourne Airport, there was no safe option available to air traffic controllers to establish a separation standard when aircraft were below minimum vector altitude.
The current legislation does not require commercial operators of aircraft not greater than 5,700 kg maximum take-off weight to provide instructions and procedures for crosschecking the quantity of fuel on board before and/or during flight. This increases the risk that operators in this category will not implement effective fuel policies and training to prevent fuel exhaustion events.
The Australian Transport Safety Bureau advises helicopter operators involved in overwater operations of the importance of undertaking regular HUET (helicopter underwater escape training) for all crew and regular passengers to increase their survivability in the event of an in-water accident or ditching.
Safety Advisory Notice for all helicopter operators engaged in overwater operations
The lack of manufacturer written advice, limitations, cautions, or warnings (written or aural) about autopilot response to manual pilot control inputs meant that pilots may be unaware that their actions can lead to significant out of trim situations, and associated aircraft control issues.
The lack of manufacturer written advice, limitations, cautions, or warnings (written or aural) about autopilot response to manual pilot control inputs meant that pilots may be unaware that their actions can lead to significant out of trim situations, and associated aircraft control issues.
The operator commenced regular public transport operations into Kosrae with the only instrument approach available for use being an offset procedure based on a non-precision navigation aid. The risk associated with this type of approach was amplified due to the need to use a 'dive and drive' style technique instead of a stable approach path, and that it required low level circling manoeuvring from the instrument approach to align the aircraft with the runway.
The operator's documented procedure for company personnel to report accidents and incidents was in itself not sufficient to ensure that occurrences that had affected, or had the potential to affect safety, were reported to management. This decreased the opportunity for the operator to identify potential operational risks and take appropriate action to minimise them.
Guidance material associated with the FAID bio-mathematical model of fatigue did not provide information about the limitations of the model when applied to roster patterns involving minimal duty time or work in the previous 7 days.
Consistent with widely-agreed safety science principles, the Civil Aviation Safety Authority’s approach to surveillance of larger charter operators had placed significant emphasis on systems-based audits. However, its implementation of this approach resulted in minimal emphasis on evaluating the actual conduct of line operations (or ‘process in practice’).
The Civil Aviation Safety Authority’s procedures and guidance for scoping an audit included several important aspects, but it did not formally include the nature of the operator’s activities, the inherent threats or hazards associated with those activities, and the risk controls that were important for managing those threats or hazards.
Although the Civil Aviation Safety Authority (CASA) collected or had access to many types of information about a charter and/or aerial work operator, the information was not integrated to form a useful operations or safety profile of the operator. In addition, CASA’s processes for obtaining information on the nature and extent of an operator’s operations were limited and informal. These limitations reduced its ability to effectively prioritise surveillance activities.
Although air ambulance flights involved transporting passengers, in Australia they were classified as ‘aerial work’ rather than ‘charter’. Consequently, they were subject to a lower level of regulatory requirements than other passenger-transport operations (including requirements for fuel planning flights to remote islands).
The available regulatory guidance on in-flight fuel management and on seeking and applying en route weather updates was too general and increased the risk of inconsistent in-flight fuel management and decisions to divert.
Although passenger-carrying charter flights to Australian remote islands were required to carry alternate fuel, there were no explicit fuel planning requirements for other types of other passenger-carrying flights to remote islands. There were also no explicit Australian regulatory requirements for fuel planning of flights to isolated aerodromes. In addition, Australia generally had less conservative requirements than other countries regarding when a flight could be conducted without an alternate aerodrome.
The operator had not formally defined the roles and responsibilities of key positions involved in monitoring and managing flight operations, such as the standards manager for each fleet and the General Manager Flying Operations (Medivac and Charter).
Although the operator’s safety management processes were improving, its processes for identifying hazards extensively relied on hazard and incident reporting, and it did not have adequate proactive and predictive processes in place. In addition, although the operator commenced air ambulance operations in 2002, and the extent of these operations had significantly increased since 2007, the operator had not conducted a formal or structured review of its risk controls for these operations.
Although the operator installed an enhanced ground proximity warning system (EGPWS) and traffic alert and collision avoidance system (TCAS) on VH-NGA in August 2009, it did not provide relevant flight crew with formal training on using these systems, or incorporate relevant changes into the aircraft’s emergency procedures checklists.
The operator’s application of its fatigue risk management system overemphasised the importance of scores obtained from a bio-mathematical model of fatigue (BMMF), and it did not have the appropriate expertise to understand the limitations and assumptions associated with the model. Overall, the operator did not have sufficient risk controls in addition to the BMMF to manage the duration and timing of duty, rest and standby periods.
Although the operator provided its flight crew with basic awareness training in crew resource management (CRM), it was limited in nature and did not ensure flight crew were provided with sufficient case studies and practical experience in applying relevant CRM techniques.
The operator’s risk controls did not provide assurance that the occupants on an air ambulance aircraft would be able to effectively respond in the event of a ditching or similar emergency. Specific examples included:
