AD/RAD/4 - Bendix D.F. Receiver Mechanical Filter Circuit - Modification

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of the Commonwealth of Australia, address the need for stringent safety standards within the aviation industry. These regulations form part of the broader framework that ensures the safe operation of civil aircraft, with particular attention to the maintenance and modifications of radio communication and navigation equipment. One such regulation, AD/RAD/4, pertains specifically to the modification of the mechanical filter circuit in Bendix D.F. Receivers Type DFA-70 fitted with 1500 cps Mech. Filter Type FLA-70A-3. This directive aims to rectify any potential safety issues associated with these components, ensuring that they meet the requisite safety standards before being installed in an aircraft. The overarching policy objective is to maintain the highest standards of aviation safety by providing clear, enforceable guidelines for the maintenance and modification of critical aircraft equipment.

Scope and Application

The Civil Aviation Safety Authority (CASA) has implemented a specific Airworthiness Directive (AD) under the Civil Aviation Regulations 1998, which targets the modification of the mechanical filter circuit in Bendix Automatic DF Receivers Type DFA-70 fitted with a 1500 cps Mechanical Filter Type FLA-70A-3. This directive applies to all such devices used within the aviation industry in Australia. The directive aims to ensure that the radio communication and navigation equipment meets required safety standards before being installed in an aircraft. This regulation is enforced across the entire Commonwealth of Australia, ensuring uniformity in safety standards across state and territory boundaries. Compliance with this directive is mandatory and must be achieved before the equipment is installed in any aircraft, as specified in the directive through referenced documents such as Bendix Radio Service Bulletin No. M-249 Issue 1, or Aeronautical Notice (ANO) 107.9.6.2.2. The directive does not specify any exclusions, exemptions, or thresholds, thus applying universally to the targeted equipment. Any further clarification or extension of the directive's application may be addressed through subordinate instruments issued by CASA.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 – 107 Civil Aviation Safety Authority Schedule of Airworthiness Directives (AD/RAD/4), mandates modifications to the Bendix Automatic Direction Finder (DF) Receivers Type DFA-70 fitted with the 1500 cps Mechanical Filter Type FLA-70A-3. These modifications are intended to ensure the equipment's continued safe operation (Section 39-107). The applicability of this directive is limited to the specified Bendix receivers, and compliance must be demonstrated before the equipment is installed in an aircraft. The compliance documents referenced are either the Bendix Radio Service Bulletin No. M-249 Issue 1 or the Aeronautical Notice (ANO) 107.9.6.2.2. Entities governed by this directive must ensure that any Bendix Automatic DF Receivers Type DFA-70 fitted with the 1500 cps Mechanical Filter Type FLA-70A-3 undergo the required modifications as outlined in either the Bendix Radio Service Bulletin No. M-249 Issue 1 or ANO 107.9.6.2.2. This includes verifying that the modifications are completed before the equipment is installed in an aircraft. The onus is on the aircraft operator or maintenance organisation to adhere to these specifications to maintain the airworthiness of the equipment and, by extension, the safety of the aircraft. Failure to comply with the provisions of AD/RAD/4 may result in serious safety implications. The Civil Aviation Safety Authority (CASA) may take enforcement action against entities that fail to adhere to the airworthiness directives. While the specific penalties or consequences for non-compliance are not detailed in the legislative instrument, it is understood that such breaches could lead to severe civil or criminal penalties, as per other sections of the Civil Aviation Regulations 1998. The seriousness of the potential repercussions underscores the importance of strict adherence to the requirements set forth in the directive.