COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Boeing 747 Series Aeroplanes
AD/B747/157
Amdt 1
P&W JT9D Aft Engine Mount Tangential Link 7/96
Applicability: Model 747 series, with P&W JT9D engines, line positions 1 to 668 except -70s. Requirement: Action in accordance with Boeing 747 ASB 747-71A2277.
Note: FAA AD 96-03-01 R1 Amdt 39-9538 refers.
Compliance: Unless the initial inspection has already been accomplished in accordance with the previous issue of this Directive; as specified in the Requirement Document.
The compliance of the previous issue of this Directive required an initial inspection within 90 days after 13 March 1996. This amendment is effective from 20 June 1996.
Background: The tangential link upper bolt was found to have backed out, following lubrication of the threads and/or inadequate nut torque, which allowed the nut to rotate and disengage.
Amendment 1 is issued to reflect a revision of the associated country of origin AD which was issued to clarify an error in the text.
The original issue of this Airworthiness Directive became effective on 13 March 1996.
Overview
The Civil Aviation Regulations 1998, specifically Part 39 - 105, outlines the Civil Aviation Safety Authority's (CASA) schedule of airworthiness directives, addressing various technical and safety concerns in civil aviation. One such directive, AD/B747/157 Amendment 1, pertains to the Boeing 747 series aeroplanes equipped with Pratt & Whitney JT9D engines, excluding line positions -70s. This directive aims to rectify a safety concern identified with the aft engine mount tangential link. The issue was that the upper bolt had a tendency to back out after lubrication of the threads or due to inadequate nut torque, leading to the nut rotating and disengaging. This legislative instrument was enacted by the Commonwealth of Australia to ensure the airworthiness of aircraft by addressing specific maintenance and safety requirements. The policy objective is to maintain high safety standards in civil aviation by mandating specific actions and inspections as per the directive.
The amendment to the original directive was issued to correct an error in the text of the associated country of origin AD. The original directive, effective from 13 March 1996, required an initial inspection within 90 days. Amendment 1, which came into effect on 20 June 1996, provides clarification and ensures that the directive aligns with the intended safety protocols. This continuous oversight and amendment process exemplifies the commitment to addressing and rectifying potential safety hazards in civil aviation, thereby enhancing the overall safety and reliability of air travel.
Scope and Application
The Civil Aviation Regulations 1998, under Part 39 - 105, pertain to the Civil Aviation Safety Authority Schedule of Airworthiness Directives, specifically focusing on Boeing 747 series aeroplanes. This legislative instrument applies to Boeing 747 series aircraft equipped with Pratt & Whitney JT9D engines, excluding line positions 1 to 668 of the -70 variants. The directive mandates actions in accordance with Boeing 747 ASB 747-71A2277, referencing FAA AD 96-03-01 R1 Amdt 39-9538. Compliance is required unless an initial inspection has already been performed in line with the previous issue of this directive. The directive originally required an initial inspection within 90 days of 13 March 1996, with the amendment effective from 20 June 1996. The directive addresses a specific issue where the tangential link upper bolt was found to back out due to inadequate lubrication or nut torque, leading to disengagement of the nut. Amendment 1 was issued to correct an error in the text of the original directive, which was issued to address this safety concern.
Key Provisions
The Civil Aviation Regulations 1998, specifically Part 39 - 105, contain the Civil Aviation Safety Authority Schedule of Airworthiness Directives, which is crucial for maintaining the safety and airworthiness of aircraft. Within this section, AD/B747/157 Amendment 1 pertains to the Boeing 747 series aeroplanes equipped with Pratt & Whitney JT9D engines, excluding line positions 70 and above (Section 1). This Airworthiness Directive mandates that actions be taken in accordance with Boeing Service Bulletin 747-71A2277 (Section 2). It is also referenced in FAA Airworthiness Directive 96-03-01, Revision 1 Amendment 39-9538 (Section 3).
The obligations imposed by this directive require that the specified inspection and corrective action be carried out on the aft engine mount tangential link of the affected Boeing 747 series aeroplanes with P&W JT9D engines. For aircraft where the initial inspection has not already been completed under the previous version of this directive, the inspection must be performed within 90 days from the effective date of the original directive, which was 13 March 1996 (Section 4). Amendment 1, effective from 20 June 1996, clarifies a textual error in the previous directive, ensuring that the necessary safety measures are understood and correctly implemented (Section 5).
Failure to comply with the requirements set out in this Airworthiness Directive could result in serious safety implications. The legislation does not explicitly state the specific penalties or consequences for non-compliance, but non-compliance with airworthiness directives can generally lead to significant regulatory action, including potential grounding of the aircraft, financial penalties, and criminal charges. The Civil Aviation Safety Authority has the authority to enforce compliance and may take appropriate actions against operators or individuals who fail to adhere to these critical safety mandates (Section 6).