Overview

The Civil Aviation Regulations 1998, enacted by the Australian Parliament, aim to ensure the safety and efficiency of civil aviation. A particular component of this legislative framework is the Schedule of Airworthiness Directives, which mandates specific safety measures for various aircraft models. One such directive, AD/CESSNA 400/77, pertains to the Cessna 400 Series Aeroplanes, specifically models 421C with serial numbers ranging from 421C0801 to 421C0886. This directive addresses a safety issue concerning the fasteners used in the attachment of the Aft Auxiliary Wing Spar Caps to the stub wing, requiring their replacement with NAS517-3-5 Screws and HL70-6 Hylok collars to ensure compliance before the issuance of an Australian Certificate of Airworthiness. The policy objective behind such directives is to maintain high safety standards within the Australian aviation industry, thereby protecting public safety and ensuring operational reliability. The Australian Civil Aviation Safety Authority (CASA) issues these Airworthiness Directives to enforce specific modifications and safety checks on aircraft, ensuring they meet necessary safety standards. The directive for the Cessna 400 Series Aeroplanes is a direct response to a safety concern identified by the manufacturer, which necessitates immediate action to prevent potential hazards. By mandating these modifications before the issuance of an Australian Certificate of Airworthiness, CASA aims to uphold stringent safety protocols and mitigate any risks associated with the identified issue, thereby safeguarding both the aircraft and those operating it.

Scope and Application

The Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998, specifically within Part 39 - 105, mandates compliance with airworthiness directives for the Cessna 400 Series aeroplanes. This particular directive, AD/CESSNA 400/77, applies to all model 421C Cessna aeroplanes with serial numbers ranging from 421C0801 to 421C0886. The directive stipulates that the fasteners used in the attachment of the Aft Auxiliary Wing Spar Caps to the stub wing must be replaced with NAS517-3-5 Screws and HL70-6 Hylok collars before an Australian Certificate of Airworthiness can be issued, as per the manufacturer’s advisory outlined in the Cessna Multi-Engine Customer Care SIL ME80-38 document. This directive ensures that the specified modifications are implemented to maintain the structural integrity and safety of the aircraft, thereby adhering to national aviation safety standards.

Key Provisions

The primary operative sections of the Civil Aviation Regulations 1998, Part 39 - 105, specifically AD/CESSNA 400/77, pertain to the modification of the aft auxiliary wing spar attachment for Cessna 400 series aeroplanes. These sections require that all model 421C aeroplanes with serial numbers (S/Nos.) ranging from 421C0801 to 421C0886 must undergo a specific modification before an Australian Certificate of Airworthiness is issued (s. 39 - 105). The modification involves replacing the fasteners used in the attachment of the aft auxiliary wing spar caps to the stub wing with NAS517-3-5 screws and HL70-6 Hylok collars. Compliance with this directive must be evidenced by the Cessna Multi-Engine Customer Care SIL ME80-38 document. The obligations and requirements imposed by this legislation on the parties or entities it governs are stringent. Owners and operators of the specified Cessna 400 series aeroplanes must ensure that the required modifications are carried out before any Australian Certificate of Airworthiness is issued. This includes the necessity for the replacement of existing fasteners with NAS517-3-5 screws and HL70-6 Hylok collars, as detailed in the manufacturer's advisory and documented in the SIL ME80-38. This requirement is non-negotiable and must be strictly adhered to in order to comply with the Civil Aviation Regulations. Failure to comply with the provisions set forth in these sections could result in severe consequences. The Civil Aviation Regulations 1998 outline that non-compliance with airworthiness directives can lead to both civil and criminal penalties. For civil penalties, the maximum fines can be substantial, potentially reaching tens of thousands of dollars, depending on the severity and frequency of the breach. Additionally, criminal penalties may apply, including imprisonment, if the breach is deemed to have caused significant harm or risk to aviation safety. These stringent measures are in place to ensure that all parties maintain the highest standards of aircraft safety and operational compliance.