AD/BEECH 400/7 - Wheel Speed Transducer Drive Clip

Overview

The Civil Aviation Regulations 1998 were enacted to provide a comprehensive framework for civil aviation safety in Australia, ensuring the safe and efficient operation of aircraft. Part 39 of these regulations includes Airworthiness Directives, which are legally enforceable rules issued by the Civil Aviation Safety Authority (CASA) to address specific safety issues. The directive AD/BEECH 400/7, issued on 6 September 1994, is aimed at addressing a critical safety concern identified with certain Beechcraft 400 Series aeroplanes. Specifically, it addresses the potential for the anti-skid braking system to disengage during landing, which was reported to have occurred due to an issue with the main wheel hubcap drive clip and the anti-skid wheel speed transducer. The directive mandates modifications to the hubcaps and requires the inclusion of specific inspection procedures to prevent this issue from recurring, ensuring the continued airworthiness and safety of the affected aircraft. The policy objective of AD/BEECH 400/7 is to mitigate the risk of anti-skid system disengagement by enforcing precise modifications and inspections on the specified models of Beechcraft 400 Series aeroplanes. This directive was issued to prevent potential safety incidents and to ensure compliance with safety standards set by CASA. The directive requires compliance within a specified timeframe, underscoring the urgency and importance of the safety measures it mandates.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, pertains to the Civil Aviation Safety Authority's (CASA) schedule of airworthiness directives for Beechcraft 400 Series aeroplanes. This regulation applies to Model 400A aircraft with serial numbers RK-1 through RK-23 that have undergone the Beechcraft Kit No. 128-8001-1S increased landing weight modification, as well as those with serial numbers RK-24 through RK-76. The directive mandates the replacement or rework of the left and right hand hubcaps on the main landing gear and the incorporation of a specific inspection procedure to ensure the transducer drive clip gap does not exceed 0.20 inch (5 mm), as detailed in Beechcraft Service Bulletin 2549. Compliance with these directives is required within 25 hours’ time in service after 27 April 1994, or prior to 27 May 1994, whichever occurs first. This regulation underscores the importance of maintaining the airworthiness of affected aircraft and ensuring the safety of aviation operations within Australia.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39, Section 105, mandates the compliance of Airworthiness Directives (AD) for Beechcraft 400 Series aeroplanes. This section, referenced as AD/BEECH 400/7, addresses the critical issue of the wheel speed transducer drive clip in certain Beechcraft 400A aircraft models. The directive applies to aircraft with serial numbers RK-1 through RK-23 that have undergone the Beechcraft Kit No. 128-8001-1S (increased landing weight modification) and aircraft with serial numbers RK-24 through RK-76. The main requirements outlined in the directive are to either replace the existing hubcaps on the main landing gear with new ones or rework the existing hubcaps by adding a spacer and reidentifying them as per Beechcraft Service Bulletin 2549. Additionally, the maintenance system for the aircraft must incorporate the inspection procedure detailed in the same service bulletin to ensure the gap in the drive clip does not exceed 0.20 inches (5 mm), which must be performed each time a hubcap is removed. Operators of the affected aircraft must adhere to the compliance timeline stipulated in the directive, which requires compliance within 25 hours’ time in service after 27 April 1994, or before 27 May 1994, whichever comes first. It is also noted that requirement 2 of this directive will necessitate approval in accordance with Civil Aviation Regulations (CAR) 42M. This approval process ensures that the modifications and inspections align with the regulatory standards and safety requirements set forth by the Civil Aviation Safety Authority (CASA). Failure to comply with the provisions outlined in AD/BEECH 400/7 can result in significant legal and safety consequences. The Civil Aviation Regulations 1998 impose strict obligations on aircraft operators to ensure that the mandated changes and inspections are carried out within the specified timeframe. Non-compliance could lead to enforcement actions, including penalties. Although the specific penalties are not detailed within the directive, violations of civil aviation regulations generally can result in fines and other enforcement measures by CASA. In severe cases, failure to adhere to these directives may also impact the airworthiness certification of the aircraft, potentially leading to grounding until compliance is achieved.