COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Pratt and Whitney Turbine Engines - JT9D Series
AD/JT9D/25 Fan Blade Inspection/Revised Shroud Angle 8/94
Applicability: All JT9D-7R4 Series engines.
Requirement: 1. Inspect fan blade leading edges in accordance with Pratt and Whitney Service Bulletin 72-255 Revision 5.
2. Incorporate fan blades featuring a revised shroud angle in accordance with Pratt and Whitney Service Bulletin 72-309 Revision 10.
Incorporation of Pratt and Whitney Service Bulletin 72-309 Rev 10 constitutes terminating action for the repetitive inspection per Requirement 1.
Note: FAA AD 94-08-06 also refers.
Compliance: 1. Initially within 200 cycles in service from 21 July 1994, and thereafter, at intervals not to exceed 200 cycles.
2. No later than 21 July 1996.
Background: This Directive is issued to prevent fan blade failures that have been attributed to a combination of high vibratory stresses and foreign object damage.
Overview
The Civil Aviation Regulations 1998, specifically under PART 39 - 106, includes the Civil Aviation Safety Authority Schedule of Airworthiness Directives which governs the maintenance and safety standards of aircraft engines, including those by Pratt and Whitney. This legislative instrument, AD/JT9D/25, was introduced to address issues related to fan blade failures in JT9D-7R4 Series engines, which were linked to high vibratory stresses and foreign object damage. The objective is to ensure that these engines meet safety standards to prevent such failures. The enacting body is the Civil Aviation Safety Authority, which operates under the Australian Government to regulate and ensure the safety of civil aviation.
Compliance with this directive is mandatory, requiring inspections of fan blade leading edges and the incorporation of fan blades with a revised shroud angle, as outlined in Pratt and Whitney's service bulletins. The initial compliance period started within 200 cycles in service from 21 July 1994, with subsequent inspections to be carried out at intervals not exceeding 200 cycles. The directive mandates that all compliance must be completed by 21 July 1996, ensuring that the engines are maintained to the highest safety standards.
Scope and Application
The Civil Aviation Regulations 1998, specifically Part 39 - 106, applies to all JT9D-7R4 Series engines used in civil aviation within Australia. The legislation mandates a series of specific requirements for the inspection and modification of Pratt and Whitney turbine engines of the JT9D series to mitigate risks associated with fan blade failures. This involves inspecting the fan blade leading edges in line with Pratt and Whitney Service Bulletin 72-255 Revision 5 and incorporating fan blades with a revised shroud angle as per Pratt and Whitney Service Bulletin 72-309 Revision 10. The incorporation of these modifications constitutes the terminating action for the repetitive inspection requirement. Compliance with these directives must be achieved within 200 cycles in service from 21 July 1994 and thereafter at intervals not exceeding 200 cycles, with a final compliance deadline of 21 July 1996. This regulation ensures that the safety and reliability of aircraft engines are maintained, thereby protecting both the operators and passengers within the Commonwealth of Australia.
Key Provisions
The Civil Aviation Regulations 1998, Part 39, Section 106, as amended, specifies the Pratt and Whitney Turbine Engines - JT9D Series Airworthiness Directive AD/JT9D/25, which concerns fan blade inspection and the revised shroud angle (Section 1). This directive applies to all JT9D-7R4 Series engines (Section 2). The primary requirements of this directive are to inspect the fan blade leading edges in accordance with Pratt and Whitney Service Bulletin 72-255 Revision 5 and to incorporate fan blades featuring a revised shroud angle as outlined in Pratt and Whitney Service Bulletin 72-309 Revision 10 (Section 3). The incorporation of these revised fan blades serves as the terminating action for the repetitive inspections stipulated in Requirement 1 (Section 4).
Entities governed by this Act must ensure compliance with the specified inspection and incorporation requirements. Initially, the inspections must be conducted within 200 cycles in service from 21 July 1994, and subsequently, the inspections must not exceed intervals of 200 cycles (Section 5). Additionally, the incorporation of the revised fan blades must be completed no later than 21 July 1996 (Section 6). These obligations are designed to mitigate the risks associated with fan blade failures due to high vibratory stresses and foreign object damage (Section 7).
Failure to comply with the Civil Aviation Regulations 1998, as outlined in this Airworthiness Directive, can result in severe consequences. The legislation does not explicitly detail the offences, penalties, or specific consequences for breach; however, non-compliance with civil aviation regulations typically results in enforcement actions by the Civil Aviation Safety Authority (CASA). These actions can include fines, operational restrictions, or other regulatory measures to ensure compliance with safety standards. The maximum penalties can vary, but they are generally substantial enough to enforce adherence to safety directives.