AD/B747/16 Amdt 3 - Nacelle Strut Midspar Fuse Pins

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of Australia, form a comprehensive legal framework governing civil aviation safety, with Part 39 detailing specific regulations concerning airworthiness. One such regulation, AD/B747/16 Amendment 3, pertains to Boeing 747 series aeroplanes and was introduced to address the recurring problem of fatigue failures in nacelle strut midspar fuse pins, as reported by the manufacturer. The policy objective behind this amendment is to ensure the ongoing safety and airworthiness of Australian-registered Boeing 747 aircraft by implementing updated inspection and maintenance procedures as mandated by the Federal Aviation Administration (FAA). This legislative instrument mandates adherence to the technical requirements specified in Telex FAA AD T92-24-51, reflecting the need to mitigate the risks associated with corrosion and fatigue cracking in the fuse pins, thereby enhancing overall aviation safety.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105 under the Civil Aviation Safety Authority Schedule of Airworthiness Directives, applies to all model 747 series aircraft. This legislation mandates adherence to technical requirements outlined in Telex FAA AD T92-24-51, referencing Boeing Service Bulletins 747-54-2063 and 747-54A2150. It addresses the critical issue of fatigue failures in the nacelle strut midspar fuse pins, necessitating specific actions to ensure airworthiness. Compliance with these directives must be met as per the requirement document, with an effective date of 18 November 1992 for aircraft registered in Australia. The directive includes amendments to previous versions, reflecting ongoing reports of corrosion and fatigue cracks in the fuse pins, particularly on aircraft equipped with Pratt and Whitney or Rolls Royce engines. This continuous update process ensures that safety measures evolve in response to emerging issues, maintaining the highest safety standards for commercial aviation operations within Australia.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39, Section 105, mandates compliance with Airworthiness Directives (AD) for the Boeing 747 series aeroplanes. The directive in question, AD/B747/16 Amendment 3, pertains to the nacelle strut midspar fuse pins. This directive applies to all Model 747 series aircraft (Section 1) and requires compliance with the technical requirements outlined in Telex FAA AD T92-24-51. Boeing Service Bulletins 747-54-2063 and 747-54A2150 also reference this directive. The compliance date for Australian registered aircraft was revised to 18 November 1992, superseding the previous compliance date of 14 October 1992 (Section 3). This amendment is effective from 18 November 1992. Operators of Boeing 747 series aircraft are required to adhere to the technical specifications outlined in the directive. This includes the removal of all old-style fuse pins and the implementation of revised inspection procedures for the new-style fuse pins. The directive mandates that these actions be taken to address reports of fatigue failures and corrosion issues, which have been identified as potential safety hazards. The directives and service bulletins provide detailed instructions on how to perform the necessary inspections and modifications. Failure to comply with these requirements could result in the aircraft being deemed unairworthy, thereby prohibiting its operation until the necessary actions have been taken. The AD/B747/16 Amendment 3 imposes several obligations on the operators of Boeing 747 series aircraft. Firstly, operators must ensure that all old-style fuse pins are removed from service. This involves a thorough inspection of the nacelle strut midspar area to identify and extract any old-style fuse pins. Secondly, operators must implement the revised inspection procedures for the new-style fuse pins, as detailed in the relevant service bulletins and FAA directives. These inspections are critical to detecting any signs of corrosion or fatigue cracking that could compromise the structural integrity of the aircraft. The operator must maintain detailed records of all inspections and modifications performed, as these records may be required for regulatory audits and compliance verification. Failure to comply with the provisions of AD/B747/16 Amendment 3 could result in significant legal and operational consequences. The Civil Aviation Safety Authority (CASA) has the authority to take enforcement action against operators who do not adhere to the mandated safety directives. Such actions may include fines, suspension of the aircraft's airworthiness certificate, and potential criminal charges if the non-compliance is deemed to have caused or contributed to an aviation incident. The maximum penalties for non-compliance with Civil Aviation Regulations can include substantial fines and imprisonment for individuals found guilty of violating these regulations. Operators are, therefore, strongly advised to ensure strict adherence to the directive to avoid these serious repercussions.