AD/TPE 331/4 - Propeller Pitch Control - Modification

Overview

The Civil Aviation Regulations 1998, administered by the Civil Aviation Safety Authority (CASA), were enacted to ensure the safety and efficiency of civil aviation in Australia. These regulations, particularly Part 39 - 106, focus on the issuance of airworthiness directives to maintain the highest safety standards in aircraft operations. One such directive, AD/TPE 331/4, pertains specifically to the modification of the propeller pitch control on AlliedSignal (Garrett/AiResearch) TPE 331 Series turbine engines. This directive was introduced to address the problem of ensuring that certain engines meet updated safety requirements by mandating specific modifications as outlined in AiResearch TPE-331 SB No. 7 or AD/AIR-T/1. Compliance with this directive is required forthwith, ensuring that the affected engines adhere to the necessary safety protocols to mitigate potential risks during operation.

Scope and Application

The Civil Aviation Safety Authority Schedule of Airworthiness Directives (AD), specifically AD/TPE 331/4 concerning the AlliedSignal (Garrett/AiResearch) Turbine Engines of the TPE 331 series, applies to engines with specific serial numbers within the defined range. This directive mandates compliance with AiResearch TPE-331 Service Bulletin No. 7 or AD/AIR-T/1, focusing on modifications to the propeller pitch control system to ensure airworthiness. The directive imposes an immediate requirement for compliance, targeting operators of the affected engines to undertake the specified modifications forthwith. The AD operates under the Civil Aviation Regulations 1998, which have a national reach across Australia, ensuring uniformity in aviation safety standards and compliance throughout the Commonwealth. The AD does not explicitly mention any exclusions, exemptions, or thresholds but implies that all affected engines must adhere to the outlined requirements without deviation. The application and enforcement of the AD may be extended or specified further through subordinate instruments issued by the Civil Aviation Safety Authority.

Key Provisions

The Civil Aviation Regulations 1998 (Cth), specifically Part 39, section 106, address the airworthiness directives related to the AlliedSignal (Garrett/AiResearch) Turbine Engines of the TPE 331 series. One notable directive, AD/TPE 331/4, concerns propeller pitch control modifications and applies to specific serial number ranges of these engines (subsection 3/86). The directive mandates the implementation of AiResearch TPE-331 Service Bulletin No. 7 or AD/AIR-T/1, which provides detailed instructions on how to modify the propeller pitch control system. Compliance with this directive must occur without delay. Entities and individuals governed by these regulations must ensure that the specified propeller pitch control modifications are carried out on the applicable turbine engines. This requirement is critical for maintaining the safety and airworthiness of the aircraft using these engines. The directives are designed to address specific safety concerns identified with the TPE 331 series engines, and adherence to these directives is mandatory to ensure continued safe operation of the aircraft. Failure to comply with the airworthiness directives outlined in the Civil Aviation Regulations can lead to significant consequences. In the event of non-compliance, the Civil Aviation Safety Authority (CASA) has the authority to take enforcement actions. These may include imposing fines, taking legal action, or grounding the aircraft until the required modifications are completed. The exact penalties and consequences for non-compliance can vary depending on the severity of the breach and the specific circumstances of each case, but the regulations are clear in their intent to enforce strict compliance to uphold the highest standards of aviation safety.