AD/MSR/25 - Carburettor Heat Valve - Modification

Overview

The Civil Aviation Regulations 1998, enacted by the Commonwealth of Australia, serve to ensure the safety and efficiency of civil aviation operations. Part 39 - 105 of the Civil Aviation Regulations 1998 introduces the Civil Aviation Safety Authority Schedule of Airworthiness Directives, which aims to address specific issues that may affect the airworthiness of certain aircraft. One such directive, AD/MSR/25, pertains to Aerospatiale Rallye Series Aeroplanes, specifically targeting the modification of the carburettor heat valve. This directive applies to various models of the Rallye Series with specified serial numbers, ensuring that these aircraft meet the required safety standards. The policy objective is to mandate compliance within a defined period, in this case, within 100 hours of time in service after 31 October 1978, to prevent potential safety hazards associated with the carburettor heat valve. The Australian Government, through the Civil Aviation Safety Authority, enforces these regulations to uphold the highest safety standards in civil aviation. By issuing specific airworthiness directives, the authority ensures that aircraft maintain their airworthiness and operate safely, thereby protecting the public and maintaining the integrity of the aviation industry. The legislative framework aims to mitigate risks and maintain operational safety, ensuring that aircraft meet the necessary criteria set forth by the Civil Aviation Regulations 1998.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, applies to the Aerospatiale Rallye series aeroplanes with serial numbers falling within the specified ranges, including models MS883, MS886, MS887, Rallye 150T, 150TD, 150ST, 150ST-D, 180T and 180TD with serial numbers from 1 to 3072, as well as models MS892A, 150, MS892E, 150, MS892E, 150D, MS893A, MS893E, MS893ED, MS894A, MS894C, MS894E, Rallye 235E, and 235ED with serial numbers from 1 to 13072. The regulation mandates compliance with Airworthiness Directives (AD) concerning modifications to the carburettor heat valve, as outlined in Rallye Service Bulletin No. 137 or Bureau Veritas AD 78-147(A). Compliance must be achieved within 100 hours of time in service following 31 October 1978, and adherence to AD/MSR/14 prior to this date satisfies the requirement under this directive. This regulation operates under the Commonwealth of Australia, thereby encompassing all relevant entities and individuals within its jurisdiction.

Key Provisions

The Civil Aviation Regulations 1998, specifically in Part 39 - 105, includes the Civil Aviation Safety Authority's Schedule of Airworthiness Directives which governs the maintenance and operational safety of certain aircraft. Section AD/MSR/25 pertains to the modification of the carburettor heat valve for Aerospatiale Rallye Series aeroplanes. This section applies to models MS883, MS886, MS887, Rallye 150T, 150TD, 150ST, 150ST-D, 180T and 180TD with serial numbers 1 to 3072, and models MS892A, 150, MS892E, 150, MS892E, 150D, MS893A, MS893E, MS893ED, MS894A, MS894C, MS894E, Rallye 235E, and 235ED with serial numbers 1 to 13072 (Section 9/78). The directive requires compliance to be demonstrated through either Rallye Service Bulletin No. 137 or Bureau Veritas AD 78-147(A). Importantly, the compliance must be achieved within 100 hours of time in service after 31 October 1978. It is also noted that compliance with AD/MSR/14 prior to this directive is considered sufficient for the purposes of AD/MSR/25 (Section 9/78). Operators of the affected aircraft models must ensure that the carburettor heat valve is modified as per the specified documents, which includes performing the necessary modifications or replacements to the valve system. This requirement ensures that the aircraft maintains its airworthiness and safety standards as dictated by the Civil Aviation Safety Authority. Failure to comply with the Airworthiness Directives can lead to serious consequences. The regulations mandate that non-compliance could result in the aircraft being grounded, preventing it from being operated until the required modifications are completed. Additionally, operators found in breach of these directives may face enforcement actions, which could include fines or other penalties as stipulated by the Civil Aviation Safety Authority. The seriousness of these consequences underscores the importance of adhering to the specified maintenance and modification requirements.