COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
British Aerospace BAe 146 Series Aeroplanes
AD/BAe 146/64 Pitot-Static System - True Airspeed Computer No.2
10/96
Applicability: This Directive is applicable to BAe 146 Series 100, 100A, 200, 200A, 300 and 300A aeroplanes equipped with a True Airspeed (TAS) Computer No 2 installed in accordance with BAe Avro modification HCM40160C (SB.34-52-40160C) or HCM40298G and where a Dual Mode `S' Transponder has been installed in accordance with BAe Avro modification HCM30118B (SB.34-90-30118B) or HCM40277A (SB.34-91-40277A).
Note: The requirements of this Directive were incorporated prior to delivery on constructors number E3198 and subsequent aeroplanes, if the modifications referenced above were also incorporated.
Requirement: Install new pitot and static lines between the TAS 2 unit and the drain valve in accordance with either British Aerospace (Commercial Aircraft) Limited, Modification Service Bulletin SB.34-132-46042A dated 24 June 1991 or British Aerospace, Regional Aircraft Limited, Avro International Division, Modification Service Bulletin SB.34-132-46042A Revision 2 dated 1 July 1996.
Note: Both Service Bulletins have been classified as mandatory by the CAA(UK).
Compliance: Unless previously accomplished, then prior to 31 December 1996.
This directive becomes effective on 12 September 1996.
Background: The introduction of the Mode `S' transponder resulted in the TAS 2 unit being moved from its position on the avionics rack. This resulted in the pitot and static flexible hoses between the TAS 2 unit and the drain valve forming an unacceptable water trap. This Directive introduces new shorter flexible hoses designed to minimise the likelihood of water being trapped.
Overview
The Civil Aviation Regulations 1998, enacted by the Commonwealth of Australia, are a comprehensive set of rules governing the operation and maintenance of civil aircraft within Australia. Specifically, Part 39 - 105 of these regulations includes the Civil Aviation Safety Authority's schedule of airworthiness directives, which address specific safety concerns and required actions for various aircraft types. One such directive, AD/BAe 146/64, pertains to the British Aerospace BAe 146 Series aeroplanes. This directive was introduced to address an issue where the installation of a Mode 'S' transponder caused the True Airspeed (TAS) computer to be moved, leading to a configuration that trapped water in the pitot and static lines. This could potentially affect the accuracy of airspeed readings, thereby compromising flight safety. The directive mandates the installation of new, shorter pitot and static lines to mitigate this risk and was designed to ensure compliance by 31 December 1996.
Scope and Application
The Civil Aviation Regulations 1998, specifically Part 39 - 105, pertains to the Civil Aviation Safety Authority's (CASA) schedule of airworthiness directives, addressing safety measures for specific aircraft models. In this instance, the regulations apply to British Aerospace (BAe) 146 Series aeroplanes, namely the Series 100, 100A, 200, 200A, 300, and 300A models. The directive is particularly concerned with aeroplanes that have a True Airspeed (TAS) Computer No 2 installed under specific modifications and where a Dual Mode 'S' Transponder has been installed. This directive ensures compliance with safety standards by mandating the installation of new pitot and static lines between the TAS 2 unit and the drain valve. The directive became effective on 12 September 1996, and compliance is required unless the specified modifications were already implemented prior to this date. The directive is applicable within the Commonwealth of Australia, overseen by CASA, and extends to any aeroplanes manufactured or modified under the referenced conditions.
Key Provisions
The Civil Aviation Regulations 1998, specifically Part 39 - 105, address airworthiness directives for various aircraft, including the British Aerospace BAe 146 Series Aeroplanes. Section AD/BAe 146/64 pertains to the pitot-static system and the True Airspeed (TAS) Computer No 2. This directive applies to BAe 146 Series 100, 100A, 200, 200A, 300, and 300A aeroplanes equipped with specific modifications to the TAS system and a Dual Mode 'S' Transponder. The directive mandates that new pitot and static lines be installed between the TAS 2 unit and the drain valve, in accordance with British Aerospace Modification Service Bulletins SB.34-132-46042A dated 24 June 1991 or its revised version dated 1 July 1996. This requirement ensures that the new flexible hoses are designed to minimise water trapping, which was an issue with the older configurations.
Operators and owners of BAe 146 aeroplanes covered by this directive must ensure that the specified modifications are carried out before 31 December 1996. The directive becomes effective on 12 September 1996, and compliance is mandatory. These obligations include obtaining the correct parts and ensuring that the modifications are carried out by appropriately qualified personnel. The directive also states that aeroplanes constructed after a certain point, identified by constructor number E3198, should already incorporate these requirements if the relevant modifications were installed.
Failure to comply with this airworthiness directive can lead to serious safety issues, potentially rendering the aircraft non-airworthy. The regulations do not specify particular penalties for non-compliance in this directive, but non-compliance with airworthiness directives generally can lead to enforcement actions by the Civil Aviation Safety Authority (CASA). These actions can include grounding the aircraft, fines, and potentially criminal charges for operators who deliberately or negligently fail to comply with the regulations. The severity of the consequences depends on the nature and extent of the non-compliance and the impact on flight safety.