Overview

The Civil Aviation Regulations 1998, specifically in Part 39, address the safety and airworthiness of aircraft through various directives. One such directive, AD/F50/1, applies to Fokker F50 (F27 Mk 50) series aeroplanes with particular serial numbers, aiming to rectify an identified safety issue with the central windshield post connection to the pressure bulkhead. This directive was introduced in response to fatigue failures observed in the central windshield post lug during manufacturer testing, which prompted the development of a modification to enhance the structural integrity of this joint. The policy objective is to ensure that the identified safety concerns are addressed to maintain the airworthiness of the affected aircraft, with compliance required before the aircraft exceed 10,000 flights. This legislative instrument was enacted by the Australian Government and is administered by the Civil Aviation Safety Authority (CASA) to enforce standards that safeguard the aviation industry. The regulation serves to mandate specific modifications to the Fokker F50 aircraft, ensuring that these aircraft meet the required safety standards and are maintained in a reliable airworthy condition. The directive references Fokker Service Bulletin F 50-53-001, providing a detailed method for implementing the necessary structural modifications, and notes the relevance of RLD BLA No 88-18.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105 under the Civil Aviation Safety Authority Schedule of Airworthiness Directives, mandates the modification of Fokker F50 (F27 Mk 50) series aeroplanes with serial numbers 20104 to 20107 inclusive. This directive applies directly to these particular aircraft, requiring them to undergo a modification in accordance with Fokker Service Bulletin F 50-53-001. The primary purpose of this modification is to enhance the fatigue resistance of the central windshield post connection to the pressure bulkhead, as the lug at the bottom of the central windshield post has been known to break during the manufacturer’s fatigue tests. The requirement to comply with this airworthiness directive must be met before the aircraft exceeds 10,000 flights, as indicated by the note referencing RLD BLA No 88-18. This regulation is strictly applicable to the specified models and serial numbers of the Fokker F50 series aeroplanes within the Commonwealth of Australia.

Key Provisions

The Civil Aviation Regulations 1998, Part 39 - 105, provides specific airworthiness directives that govern the maintenance and operation of certain aircraft. In this context, AD/F50/1 pertains to the Fokker F50 (F27 Mk 50) series aeroplanes, specifically those with serial numbers 20104 to 20107 (1). This directive requires that the central windshield post connection to the pressure bulkhead be modified in accordance with Fokker Service Bulletin F 50-53-001 (1). This modification is necessary to enhance the fatigue resistance of the critical structural joint, which was found to be inadequate based on the manufacturer's fatigue test results (1). The regulations impose a clear obligation on aircraft operators to ensure compliance with this airworthiness directive (1). Operators must carry out the specified modification before the aircraft exceeds 10,000 flights (1). This requirement is designed to maintain the structural integrity of the affected aircraft, thereby ensuring the safety of passengers and crew. Failure to comply with this directive could result in the aircraft being deemed unairworthy, potentially leading to operational restrictions or grounding. Breaching the requirements set forth in AD/F50/1 could lead to significant legal and operational consequences. Under the Civil Aviation Act 1988, non-compliance with airworthiness directives can result in enforcement actions, including fines and potential prosecution (2). The severity of the penalties depends on the nature and extent of the breach, with maximum penalties for serious violations potentially including substantial fines and imprisonment (2). Additionally, operators may face civil liability for any accidents or incidents resulting from non-compliance, further underscoring the importance of adhering to these regulatory requirements. In summary, AD/F50/1 mandates a specific modification to the central windshield post connection of Fokker F50 series aeroplanes to prevent structural failure due to fatigue (1). Operators must ensure that this modification is completed before the aircraft exceeds 10,000 flights (1). Non-compliance with this directive can result in severe penalties, including fines, prosecution, and potential civil liability for any resulting incidents (2). Therefore, it is crucial for operators to adhere strictly to the provisions of this airworthiness directive to maintain the safety and airworthiness of their aircraft.