AD/B727/108 - Aileron Power Control Unit

Overview

The Civil Aviation Regulations 1998 (Cth) were enacted to ensure the safety and regulation of civil aviation within Australia, addressing gaps in airworthiness and operational standards. Specifically, Part 39 - 105 of these regulations includes the Civil Aviation Safety Authority Schedule of Airworthiness Directives, which are designed to mandate regular inspections and maintenance actions to prevent aviation accidents and incidents. This particular legislation, AD/B727/108, targets Boeing 727 series aeroplanes by requiring the replacement or inspection of aileron power control units (PCUs) to prevent aileron control wheel binding, which has been linked to seal deterioration after a significant number of flight hours. The objective of this directive is to ensure the continued airworthiness of the aircraft by addressing potential failures in the aileron PCUs through regular maintenance actions.

Scope and Application

The Civil Aviation Regulations 1998, specifically PART 39 - 105, applies to all Boeing 727 series aeroplanes, focusing on the airworthiness directives (AD) for the aileron power control units (PCU). These directives mandate that any aileron PCU which has accumulated 18,000 or more hours since new or since the piston seal replacement must be replaced or tested for internal leakage according to Boeing Alert SB 727-27A0220. Compliance with the National Water Lift Service Bulletins 27-21-1/200 or 27-10-1/200 Revision 1 is considered terminating action for these ADs, meaning that if these service bulletins have been followed, the AD requirements are deemed to be satisfied. Compliance with these regulations is required within 3,000 hours time in service on the PCU after 15 June 1989, and subsequently at intervals not exceeding 18,000 hours or 2,500 flight cycles. The legislation extends its reach across the Commonwealth of Australia, ensuring the safety of aviation operations by addressing known issues with the aileron PCU.

Key Provisions

The Civil Aviation Regulations 1998, specifically in Part 39 - 105, address the airworthiness of Boeing 727 Series aeroplanes through the Airworthiness Directive AD/B727/108 concerning the aileron power control unit (PCU). This directive is focused on ensuring the safety of aircraft by addressing issues related to the aileron PCU, which has been linked to incidents of control wheel binding due to internal damage and seal deterioration. The directive requires that aileron PCUs which have accumulated 18,000 or more hours since new or since the last piston seal replacement be either removed and replaced (Section 1) or removed and subjected to a hydraulic bench internal leakage check, with replacement of any unit that fails the internal leakage test (Section 2). Compliance with this directive is mandatory for all model 727 series aeroplanes, and it supersedes previous directives such as National Water Lift SB 27-21-1/200 or NWL SB 27-10-1/200 Revision 1. Under this Act, the obligations placed on the operators and owners of Boeing 727 Series aeroplanes are stringent. They must ensure that aileron PCUs are inspected, tested, and either replaced or repaired according to the specified intervals. Compliance must be achieved within 3,000 hours of time in service on the PCU following 15 June 1989, and thereafter at intervals not exceeding 18,000 hours for replacement or 2,500 flight cycles for the internal leakage test. Failure to comply with these obligations could lead to serious safety implications and potential legal ramifications. In terms of the consequences for non-compliance, the legislation does not explicitly outline specific offences or penalties within the directive itself. However, non-compliance with airworthiness directives under the Civil Aviation Regulations 1998 can lead to enforcement actions by the Civil Aviation Safety Authority (CASA). Such actions may include the issuance of directives to rectify the non-compliance, grounding of the aircraft until compliance is achieved, and potential fines or other penalties as stipulated in the broader regulatory framework. The severity of these penalties can vary, but they are designed to ensure that all operators adhere to the safety standards set forth to protect the public and maintain the integrity of the aviation system.