AD/CESSNA 150/26 - Wing Flap Actuator Ball Nut Assemblies

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of Australia, constitute a critical framework governing aviation safety, among other aspects of civil aviation. Specifically, Part 39 of these regulations includes the Airworthiness Directives (AD) aimed at ensuring the safe operation of aircraft. One such AD, AD/CESSNA 150/26, pertains to the Cessna 150, F150, 152 & F152 series aeroplanes and was introduced to address safety issues related to the wing flap actuator ball nut assemblies. This directive responds to the need for regular inspection and maintenance to prevent potential failures that could compromise flight safety. The policy objective is to ensure that these aircraft meet specific airworthiness standards to maintain safety and operational integrity. The AD/CESSNA 150/26 requires operators to inspect and potentially replace the wing flap actuator ball nut assemblies based on specific date stamp codes and mandates the installation of placards to alert pilots of restrictions on flap extension under certain conditions. Compliance with these directives is crucial to avoid operational risks and maintain the highest safety standards in the aviation industry. The Civil Aviation Safety Authority (CASA) oversees the enforcement of these regulations to ensure that all aircraft meet the necessary safety requirements before further flight.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105 concerning the Civil Aviation Safety Authority Schedule of Airworthiness Directives, apply to specific models of Cessna aeroplanes, namely the Cessna 150, F150, 152, and F152 series. This legislation mandates that these aircraft models, with serial numbers as detailed in Cessna SL SE 76-25, must adhere to the requirements outlined in AD/CESSNA 150/26. The regulations focus on the inspection and replacement of the wing flap actuator ball nut assemblies, particularly for models 150 and A150 with specific serial numbers. The directive requires an inspection of the wing flap actuator for a date stamp code, with placards required for certain codes to prohibit flap extension, and mandates the replacement of the affected assemblies according to Cessna SL SE 76-25. Compliance must be achieved before further flight following the specified date and within a defined timeframe for replacement. The regulations have a national reach, applying to all aircraft operating within Australia, and there are no exclusions or exemptions specified in this directive.

Key Provisions

The Civil Aviation Regulations 1998, specifically in Part 39, detail several sections that govern the airworthiness directives for various aircraft, including Cessna 150, F150, 152, and F152 series aeroplanes. Section 39-105 focuses on the authority's schedule of airworthiness directives for these aircraft, outlining specific maintenance and operational requirements to ensure safety and compliance with aviation standards. For instance, AD/CESSNA 150/26 addresses the inspection and replacement of wing flap actuator ball nut assemblies in certain models. The main operative sections of this directive (section 39-105) require that specific inspections and actions be taken on certain Cessna aeroplanes. Section 1 mandates that operators inspect the P/N C301002-0101 wing flap actuator for a date stamp code, as detailed in Cessna SL SE 76-25. If the date stamp code on the actuator is OH, HH, WH, or ZH, a placard must be installed near the flap control stating "FLAP EXTENSION PROHIBITED" (section 2). This placard can be removed once the requirements of section 3 are satisfied. Section 3 requires that the affected wing flap actuator ball nut assemblies be replaced in accordance with Cessna SL SE 76-25. The obligations imposed by these sections include timely inspections and necessary modifications to maintain airworthiness. Operators of affected Cessna models must inspect the wing flap actuator and ensure compliance with the placarding requirement before further flight after 28 January 1977 (sections 1 and 2). Additionally, they must replace the affected wing flap actuator ball nut assemblies within 100 hours of time in service after 28 January 1977 (section 3). Failure to comply with these requirements can result in the aircraft being deemed unairworthy, which could lead to severe operational disruptions and safety risks. Failure to adhere to the provisions of these airworthiness directives can result in significant consequences. The Civil Aviation Regulations 1998 outline that non-compliance with airworthiness directives can lead to enforcement actions by the Civil Aviation Safety Authority (CASA). This can include fines, penalties, and potential grounding of the aircraft. The exact penalties can vary, but they may include substantial financial penalties and, in severe cases, criminal charges against the operators or responsible individuals. Ensuring strict adherence to these directives is, therefore, crucial for maintaining the safety and legality of the aircraft operations.