AD/G1159/29 - Flight Manual - Change to Metric Units

Overview

The Civil Aviation Regulations 1998, as amended by Legislative Instrument F2006B10031, were enacted to address the need for uniformity in airworthiness documentation across Australia, specifically focusing on the use of metric units in aircraft flight manuals. This regulation was introduced by the Australian Commonwealth Government to ensure consistency and safety standards in the aviation industry. The policy objective is to align Australian aviation practices with international standards, thereby facilitating a safer and more efficient airspace. The requirement applies to all Grumman G1159 Series Aeroplanes, mandating the adoption of metric units in various flight manual specifications such as weight, distance, centre of gravity limits, fuel and oil quantities, and pressures. Compliance with these directives was mandated by 1 January 1984 to ensure that all aircraft operations in Australia adhere to the same metric standards.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, issued by the Civil Aviation Safety Authority, mandates the conversion of flight manual units to metric for Grumman G1159 and G-IV series aeroplanes, under Airworthiness Directive AD/G1159/29. This directive applies to all G1159 series aeroplanes registered in Australia, necessitating compliance with the specified metric units for various parameters such as weight, distances, centre of gravity limits, fuel and oil quantities, and pressures. The requirement necessitates that the Department of Transport-approved flight manual must reflect these changes, with dual units specified where aircraft instrumentation is not already calibrated in metric. Compliance with these amendments is mandatory by 1 January 1984, aligning with the broader regulatory framework in Australia that standardises aviation documentation to metric units to ensure uniformity and safety across the industry. This legislative instrument does not explicitly outline exclusions, exemptions, or thresholds but adheres to the overarching framework of the Civil Aviation Regulations 1998. The applicability extends to all G1159 series aeroplanes operating within Australia, and its enforcement is a federal responsibility under the Commonwealth. The Act's requirements may be further detailed or extended through subordinate instruments, ensuring that all necessary specifications and procedures are thoroughly communicated and implemented within the aviation sector.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, mandate that the flight manual for Gulfstream (Grumman) G1159 and G-IV Series aeroplanes must be updated to reflect metric units. This is detailed in AD/G1159/29 (Section 1). The requirement is for the Department of Transport-approved flight manual to use kilograms for weight (Section 1(a)), metres for distances (Section 1(b)), millimetres for centre of gravity limits and moment arms (Section 1(c)), litres for fuel and oil quantities (Section 1(d)), and kilopascals for pressures (Section 1(e)). If the aircraft's installed instrumentation is calibrated in units other than those specified, the flight manual must provide details for both systems of measurement (Section 1). The compliance deadline for these changes is set for 1 January 1984 (Section 1). The Act imposes clear obligations on the operators and manufacturers of the Grumman G1159 Series Aeroplanes. Operators must ensure that the flight manual is amended in accordance with the requirements outlined in Section 1 of AD/G1159/29. This includes providing detailed instructions in metric units for weight, distances, centre of gravity, fuel and oil quantities, and pressures. If the aircraft's installed instruments are not already calibrated in metric units, the manual must include conversions or details for both metric and non-metric systems. The manufacturer, in this case, is responsible for making the necessary amendments to the flight manual to ensure it meets the regulatory requirements. Failure to comply with the provisions of AD/G1159/29 may result in significant consequences. While the Civil Aviation Regulations 1998 do not specify the exact penalties or consequences for non-compliance in this particular directive, generally, non-compliance with airworthiness directives can lead to enforcement actions by the Civil Aviation Safety Authority (CASA). These actions may include fines, suspension or revocation of airworthiness certificates, and potential criminal charges if the non-compliance leads to safety issues. The exact penalties would depend on the severity and impact of the non-compliance, but they can be substantial given the importance of accurate operational data for flight safety.