Overview

The Civil Aviation Safety Regulations 1998 (CASR) were enacted to ensure the safety of aircraft and aeronautical products in Australia. They were introduced by the Parliament of Australia to address the need for stringent safety standards in civil aviation. One of the ways the regulations implement this objective is through the issuance of Airworthiness Directives (AD) by the Civil Aviation Safety Authority (CASA). For instance, AD/DHC-8/94 was issued to address a safety issue identified in Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes, specifically regarding the pitot static system. This directive mandates that certain actions be taken to ensure the independence of the static pressure sources for the pilot's primary and standby instruments to prevent misleading altitude or airspeed information. This was in response to an incident investigated by Transport Canada that highlighted the risk of a leak in the static pressure system.

Scope and Application

The Civil Aviation Safety Authority (CASA) issues Airworthiness Directives (AD) under the Civil Aviation Safety Regulations 1998, which are applicable to specific types of aircraft and aeronautical products within the Commonwealth of Australia. This particular AD pertains to Bombardier (Boeing Canada/De Havilland) DHC-8 Series aeroplanes, specifically Models 102, 103, 106, 201, 202, 301, 311, 314, and 315, with serial numbers ranging from 003 through 598 inclusive. The directive requires the implementation of specific modifications to the pitot static system to correct an unsafe condition identified in an investigation by Transport Canada. The requirement stipulates that for aeroplanes with serial numbers 003 through 590, the modifications outlined in Bombardier Service Bulletin 8-34-221 must be carried out, while those with serial numbers 591 through 598 must have a different set of modifications. The AD mandates compliance within 24 months from its effective date of 25 December 2003, and it was gazetted on 3 December 2003. This AD does not explicitly mention any exclusions or exemptions and applies to all specified aircraft operating within Australia, reinforcing the importance of airworthiness and safety standards in civil aviation.

Key Provisions

The Airworthiness Directive (AD) issued under subregulation 39.1(1) of the Civil Aviation Safety Regulations 1998 (CASR 1998) pertains specifically to Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes, particularly Models 102, 103, 106, 201, 202, 301, 311, 314, and 315, with serial numbers ranging from 003 to 598. This AD, identified as AD/DHC-8/94, focuses on addressing the issue of erroneous readings of the pilot's flight instruments due to a potential leak in the static pressure system. The directive mandates specific actions to enhance the safety of these aircraft, as outlined in the requirement section of the AD. The requirement section of the AD specifies the actions that must be taken by operators of the affected aircraft. For aircraft with serial numbers 003 through 590, operators are required to incorporate modifications 8Q101238 and 8Q101340 to provide increased independence between the pilot's primary and standby instrument static pressure sources. This must be done in accordance with Part A and Part C of the Accomplishment Instructions in Bombardier Service Bulletin (SB) 8-34-221, dated 27 May 2003. For aircraft with serial numbers 591 through 598, the requirement is to correct the static system hose length by incorporating modification 8Q101340, following Part B and Part C of the Accomplishment Instructions in the same service bulletin. These modifications aim to prevent the loss of both the normal and alternate static systems, which could otherwise lead to misleading altitude or airspeed information being displayed to the flight crew. Operators of the affected DHC-8 series aeroplanes are obligated to comply with the AD within 24 months from the effective date of the directive, which is 25 December 2003. Failure to adhere to the requirements set out in the AD may result in the aircraft being deemed non-airworthy, potentially leading to operational restrictions or grounding. This underscores the importance of timely compliance to maintain the airworthiness of the aircraft and ensure the safety of all flights. Non-compliance with the AD could result in significant civil and criminal consequences. The Civil Aviation Safety Authority (CASA) has the authority to enforce penalties under the Civil Aviation Act 1988 and the Civil Aviation Regulations 1988. The maximum penalties for non-compliance with an AD can include substantial fines and, in severe cases, criminal charges against individuals responsible for the oversight of the aircraft. Additionally, the operator may face operational restrictions or be prohibited from flying the non-compliant aircraft until the required modifications are made and verified by CASA.