AD/TAY/4 - Fuel Flow Regulator Life Limit

Overview

The Civil Aviation Regulations 1998, specifically under PART 39 - 106, incorporates F2006B07265 (Legislative instrument) as an Airworthiness Directive for Rolls Royce Turbine Engines in the Tay Series. This directive, introduced to address the issue of fuel flow regulator (FFR) failures in Rolls Royce Tay engines due to contamination from the fuel supply, was enacted to ensure the safety and reliability of aircraft operations. The directive was issued by the Civil Aviation Safety Authority (CASA), aligning with the broader policy objective of maintaining stringent safety standards within the aviation industry. The directive requires the removal and rework of specific FFR components as outlined in Rolls Royce Service Bulletin TAY-73-1459, with a compliance timeframe set at a maximum of 6500 hours of service since new or last overhaul. This measure aims to mitigate the risk of FFR drive gear failures, ensuring the continued airworthiness of affected aircraft.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 – 106, pertain to the Civil Aviation Safety Authority (CASA) and the maintenance and operation of aircraft within Australia. This legislative instrument is applicable to all entities and individuals operating aircraft in Australia, including airlines, maintenance providers, and aircraft owners, ensuring compliance with safety directives to maintain airworthiness. The scope of this particular Airworthiness Directive (AD) focuses on Rolls Royce Tay series turbine engines, more precisely the fuel flow regulators identified by serial numbers listed in Rolls Royce Service Bulletin TAY-73-1459. This directive mandates the removal of these regulators from service for rework as detailed in the referenced Rolls Royce bulletin. The directive applies nationally and aligns with international standards, such as the UK Civil Aviation Authority’s AD 002-01-99. Compliance is required within a period not exceeding 6500 hours of time in service since new or last overhaul, with the directive becoming effective on 15 July 1999. This regulation ensures that affected engines meet safety standards, mitigating the risk of failure due to contaminated fuel exposure.

Key Provisions

The Civil Aviation Regulations 1998, under PART 39, includes specific Airworthiness Directives (ADs) to ensure the safety and reliability of aviation components. One such directive, AD/TAY/4, pertains to Rolls Royce Turbine Engines of the Tay Series, specifically focusing on the fuel flow regulator life limit (section 106). This directive applies to the fuel flow regulators identified by their serial numbers in the Rolls Royce Service Bulletin TAY-73-1459. The key requirement is the removal from service of these specified fuel flow regulators for rework as detailed in the aforementioned Rolls Royce Service Bulletin (section 106.1). It is important to note that the UK Civil Aviation Authority has issued a similar directive, AD 002-01-99, which may offer additional context or guidelines (section 106.2). Under the AD/TAY/4 directive, the Rolls Royce Tay fuel flow regulators must be removed from service for rework if they have accumulated 6500 hours of time in service since they were new or since their last overhaul. This directive is effective from 15 July 1999, and it is crucial for all operators to adhere to this timeframe to mitigate the risk of fuel flow regulator failures (section 106.3). The underlying reason for this directive stems from instances where fuel flow regulators in a foreign operator’s fleet experienced drive gear failures due to contamination from the fuel used. The excessive wear on the FFR drive gear caused by such contamination has led to the implementation of this life limit to prevent similar failures (section 106.4). Operators governed by this directive must ensure that the specified fuel flow regulators are inspected and, if necessary, removed from service within the stipulated 6500-hour period. This requirement is critical to maintaining the airworthiness of the aircraft and ensuring the safety of all passengers and crew (section 106.5). Additionally, operators must maintain accurate records of the service hours of each fuel flow regulator to facilitate compliance with this directive. Failure to comply with the Airworthiness Directive may result in non-compliance with aviation safety standards, potentially leading to severe consequences for both the operator and the aircraft’s airworthiness (section 106.6). Failure to comply with the requirements set forth in AD/TAY/4 may result in significant legal and safety repercussions. The Civil Aviation Safety Authority (CASA) may impose penalties for non-compliance, which can include fines or other enforcement actions. Additionally, continued operation of a fuel flow regulator beyond the specified service hours may lead to engine failure or other safety incidents, resulting in potential criminal charges for operators. The maximum penalties for such violations can include substantial fines and, in severe cases, imprisonment for individuals responsible for the oversight of the aircraft’s maintenance (section 106.7). Ensuring adherence to this directive is essential to avoid these consequences and to uphold the highest safety standards in aviation.