COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Fuel Supply and Metering Equipment
AD/FSM/30 Mixture Control Shaft Retention Screw 3/95
Applicability: Precision Airmotive Corporation Model HA-6 series carburettors as detailed in Precision Airmotive Corporation Mandatory Service Bulletin No. MSA-6.
Requirement: Install retainer clip P/N 55-A239 in accordance with Precision Airmotive Corporation Mandatory Service Bulletin No. MSA-6 or Marvel Schebler Service Bulletin No. A1- 78.
Note: FAA Airworthiness Directive 94-25-04 refers.
Compliance: Effective 2 March 1995: Unless previously accomplished; prior to 31 December 1995.
Background: This Directive has been issued to require the installation of a retainer clip to the mixture control assembly. The requirement follows advice that excessive wear on the mixture control shaft retention screw can result in the mixture shaft moving out of position and a resultant interruption to fuel flow.
Overview
The Civil Aviation Regulations 1998, specifically PART 39 - 107, includes Airworthiness Directives (AD) aimed at ensuring the safety and airworthiness of aircraft. Enacted by the Parliament of the Commonwealth of Australia, these regulations are critical in mitigating risks associated with civil aviation. AD/FSM/30, which pertains to the Mixture Control Shaft Retention Screw, was introduced to address the specific problem of excessive wear on the mixture control shaft retention screw, which could cause the mixture shaft to move out of position and disrupt fuel flow, leading to potential safety hazards. This directive was established to ensure compliance by requiring the installation of a retainer clip as specified in relevant service bulletins, with a policy objective to maintain the highest standards of aviation safety.
The Civil Aviation Safety Authority (CASA), under the authority of the Civil Aviation Act 1988, enforces these directives to uphold the integrity and safety of aviation operations. The AD/FSM/30 directive mandates the installation of a specific retainer clip to mitigate the identified risk, ensuring that any affected aircraft meet the necessary safety standards before specified deadlines. This legislative measure underscores the commitment to proactive safety management in civil aviation, aiming to prevent potential accidents and maintain operational safety.
Scope and Application
The Civil Aviation Regulations 1998, specifically Part 39 - 107, pertains to the Airworthiness Directives concerning the installation of a retainer clip in certain carburettors to ensure fuel supply and metering equipment remain effective and safe. The directive AD/FSM/30 mandates that Precision Airmotive Corporation Model HA-6 series carburettors must incorporate a retainer clip, P/N 55-A239, to address issues identified with the mixture control shaft retention screw. This directive applies to aircraft operators or owners who use the specified model of carburettors, ensuring they adhere to the installation guidelines provided in Precision Airmotive Corporation Mandatory Service Bulletin No. MSA-6 or Marvel Schebler Service Bulletin No. A1-78. The requirement must be fulfilled unless previously accomplished, with a compliance deadline set for 31 December 1995, following the directive's effective date of 2 March 1995. The geographic scope of this regulation is national, governing all civil aviation activities within Australia, and it extends to any entity or individual operating aircraft equipped with the specified carburettors. There are no stated exclusions or exemptions within the directive itself, although compliance with broader civil aviation regulations may apply. The application of this directive is extended through subordinate instruments as necessary to ensure adherence and safety in civil aviation practices.
Key Provisions
The Civil Aviation Regulations 1998, Part 39 - 107, specifically in the context of the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, addresses the maintenance and safety of fuel supply and metering equipment in aircraft. Section AD/FSM/30 focuses on the installation of a mixture control shaft retention screw for Precision Airmotive Corporation Model HA-6 series carburettors. This directive, issued on 3 March 1995, mandates that a retainer clip (P/N 55-A239) must be installed in accordance with the Precision Airmotive Corporation Mandatory Service Bulletin No. MSA-6 or Marvel Schebler Service Bulletin No. A1-78 (Sections 3/95 and Applicability). This directive references FAA Airworthiness Directive 94-25-04 and requires compliance by 2 March 1995 unless the installation has already been completed; it must be completed prior to 31 December 1995.
The obligations under this directive require aircraft owners and operators to ensure that the installation of the retainer clip is carried out as specified. This involves obtaining the appropriate retainer clip and following the instructions outlined in the referenced service bulletins. The directive ensures that any Precision Airmotive Corporation Model HA-6 series carburettors fitted to aircraft are maintained to a standard that prevents potential issues arising from excessive wear on the mixture control shaft retention screw, which could lead to an interruption in fuel flow.
Failure to comply with the requirements of this Airworthiness Directive can result in serious consequences. The regulations stipulate that non-compliance with airworthiness directives can lead to penalties and enforcement actions. While the specific penalties are not detailed in this excerpt, under the Civil Aviation Act 1988, non-compliance with CASA regulations can result in substantial fines and other regulatory actions. In severe cases, this can also lead to the grounding of aircraft until the required modifications are made, thereby impacting the operational readiness and safety of the aircraft.