Overview

The Civil Aviation Regulations 1998, specifically within PART 39 - 105, encompass a range of safety directives designed to maintain the airworthiness of various aircraft, including the British Aerospace BAe 3100 (Jetstream) series aeroplanes. One such directive, AD/JETSTREAM/26, was introduced to address issues related to the propeller governor's low-speed setting, which was found to be a factor in a prior accident. This legislative instrument was enacted to ensure the safety of aircraft operations by mandating precise settings for the propeller governor's low-speed stop, thereby preventing potential mechanical failures during critical phases of flight. The regulation applies to all Jetstream 3100 series aircraft and requires compliance with British Aerospace ASB No 76-A-JA 880442 Rev 1, with a reference to the FAA AD 88-13-02. The compliance requirement necessitates adherence to the directive within a specified timeframe unless the action has already been taken, highlighting the urgency and importance of these safety measures. The enactment of this directive by the Commonwealth of Australia through the Civil Aviation Safety Authority (CASA) aims to mitigate the risk of accidents associated with the improper setting of the propeller governor's low speed. The policy objective is to enhance the overall safety of civil aviation by ensuring that all relevant aircraft meet the specified technical standards, thereby reducing the likelihood of in-flight mechanical failures and associated hazards. This directive is a critical component of CASA's broader regulatory framework designed to maintain and improve the safety standards of aircraft operating within Australian airspace.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, pertains to the Civil Aviation Safety Authority's Schedule of Airworthiness Directives, which are binding requirements for ensuring the safe operation of aircraft within Australia. One such directive, AD/JETSTREAM/26, applies exclusively to all Jetstream 3100 series aeroplanes, mandating compliance with BAe ASB No 76-A-JA 880442 Rev 1 for the adjustment of the propeller governor low speed setting to a range between 94% and 96%. This directive is crucial to prevent dual torque oscillation, which could compromise take-off power and overall flight safety. Compliance with this directive is mandatory unless the action has already been accomplished within 50 hours of Total Incremental Service or by 22 August 1988, whichever comes first, and must also be carried out prior to the first flight after the installation of an engine or propeller governor. The directive references FAA AD 88-13-02 and was issued following an accident investigation that highlighted the importance of proper governor settings. The directive's geographic reach is national, applying uniformly across all Jetstream 3100 series aircraft operating within Australia, with no stated exclusions or exemptions.

Key Provisions

The Civil Aviation Regulations 1998, specifically in Part 39, section 105, includes a directive concerning the airworthiness of British Aerospace BAe 3100 (Jetstream) Series Aeroplanes, as detailed in AD/JETSTREAM/26. This directive pertains to the propeller governor low speed setting and requires operators to adjust the governor low speed stop to be correctly set between 95.5 and 96.0 percent. This adjustment is critical to ensure that take-off power is available, as identified during an accident investigation where dual torque oscillation was a noted factor prior to the incident. Operators must adhere to the action specified in BAe ASB No 76-A-JA 880442 Rev 1, and this directive also references FAA AD 88-13-02. Operators of Jetstream 3100 series aircraft are required to comply with the directive within 50 hours of Total In-Service time (TIS) or by 22 August 1988, whichever comes first. Additionally, the adjustment must be made prior to the first flight after the installation of an engine or propeller governor. The directive ensures that the specified low speed setting is adhered to, thereby maintaining the safety and airworthiness of the aircraft during critical phases of flight, particularly take-off. Under the Civil Aviation Regulations 1998, operators of the Jetstream 3100 series aircraft have clear obligations. They must ensure that the propeller governor low speed stop is set within the specified range of 95.5 to 96.0 percent. This adjustment must be completed within the stipulated timeframes, either within 50 hours TIS or by the specified date, and before the first flight post-installation of an engine or propeller governor. Non-compliance with these requirements could potentially compromise the airworthiness of the aircraft and therefore poses significant safety risks. Failure to comply with the requirements set out in AD/JETSTREAM/26 could result in serious consequences. Although the Civil Aviation Regulations 1998 do not specify penalties in this particular section, non-compliance generally could lead to enforcement actions by the Civil Aviation Safety Authority (CASA). Such actions may include fines, suspension or revocation of airworthiness certificates, or other regulatory sanctions. The overarching goal is to ensure that all Jetstream 3100 series aircraft maintain the necessary safety standards, thereby preventing accidents and ensuring the safety of passengers and crew.