AD/JETSTREAM/49 - Engine Control - Engine Stop Circuitry

Overview

The Civil Aviation Regulations 1998, as amended, incorporate the Airworthiness Directives (AD) issued by the Civil Aviation Safety Authority (CASA) to address specific safety concerns in civil aviation. One such AD is AD/JETSTREAM/49, which pertains to the British Aerospace BAe 3100 (Jetstream) Series Aeroplanes and was introduced to mitigate the risk of uncommanded engine shutdowns caused by a diode failure in the central annunciator panel test button circuit. This directive was enacted to ensure the continued airworthiness of Jetstream 3100 aircraft and certain Jetstream 3200 aircraft by mandating specific maintenance actions. The AD was developed in response to identified safety issues and was intended to enhance operational safety by requiring post-flight testing and modifications to the engine stop circuitry. The policy objective of AD/JETSTREAM/49 is to ensure that the identified safety issues are addressed promptly and effectively, thereby reducing the risk of uncommanded engine shutdowns and maintaining the highest standards of airworthiness. This directive was issued by CASA under the authority granted by the Civil Aviation Act 1988 and is enforced to protect the safety of the aircraft, its occupants, and the general public. Compliance with this AD is mandatory for the specified aircraft, with clear timelines provided for the required maintenance actions.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, applies to all Jetstream 3100 aircraft and to Jetstream 3200 aircraft with constructors numbers in the specified range, mandating compliance with the Airworthiness Directive (AD) concerning the engine control - engine stop circuitry. This regulation is applicable to the operators and owners of these aircraft, ensuring that specific maintenance and operational requirements are met to maintain airworthiness standards. The requirements outlined in the AD involve conducting a post-flight test of the central annunciator panel and the removal of diodes from the engine stop circuitry to prevent potential uncommanded engine shutdowns. The directive mandates that these actions be completed within specific timelines, reinforcing the importance of timely compliance to ensure safety. The geographic and jurisdictional reach of these regulations is national, applying across all states and territories within Australia. The regulations do not specify any exclusions, exemptions, or thresholds, indicating that all relevant aircraft must adhere to the outlined requirements without exception. Any further specifications or clarifications may be provided through subordinate instruments issued by the Civil Aviation Safety Authority.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, includes a schedule of airworthiness directives that apply to various aircraft models, including the British Aerospace BAe 3100 (Jetstream) Series Aeroplanes. In this context, AD/JETSTREAM/49 pertains to the engine control and specifically the engine stop circuitry. This directive mandates certain actions to be undertaken by operators of affected aircraft to ensure continued safe operation. Section 1 of the directive (Applicability) clarifies that it applies to all Jetstream 3100 aircraft and Jetstream 3200 aircraft with constructors numbers ranging from 790 to 946 inclusive. Section 2 (Requirement) outlines two key actions: first, operators must conduct a post-flight test of the central annunciator panel in accordance with Part 1 of Jetstream SB 80-A-JA 911045; and second, operators must remove diodes from the engine stop circuitry as specified in Part 2 of the same service bulletin. These requirements must be carried out within specific timeframes, with the first needing completion at the end of the last flight of the day before engine shutdown, starting from 1 November 1991, and the second requiring action within 100 hours time in service after 31 October 1991, or before 10 November 1991, whichever is sooner. The directive imposes several obligations on the operators of affected aircraft. Firstly, they must ensure that the post-flight test of the central annunciator panel is performed meticulously as outlined in the referenced service bulletin. This involves specific procedural steps that need to be followed to verify the panel's functionality. Secondly, operators must remove the specified diodes from the engine stop circuitry within the prescribed timeframe, which is either 100 hours of operation after 31 October 1991 or before 10 November 1991. Failure to adhere to these obligations can compromise the safety of the aircraft, leading to potential risks such as uncommanded engine shutdown. Non-compliance with the requirements set out in this directive can result in serious consequences. Although the specific penalties are not detailed in the extract, under the Civil Aviation Regulations, non-compliance with airworthiness directives can lead to civil penalties, including fines, and potentially criminal charges if the non-compliance results in an accident or endangers safety. The exact penalties may vary depending on the severity of the breach and the circumstances surrounding it. The directive underscores the importance of adhering to these safety measures to prevent potential hazards and ensure the continued airworthiness of the affected aircraft.