AD/BEECH 1900/11 - Fuselage Canted Bulkhead

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 105, was enacted by the Parliament of the Commonwealth of Australia to ensure the safety and reliability of civil aviation operations within Australia. One of the critical aspects of this legislation is the issuance of Airworthiness Directives (ADs) that mandate the maintenance and inspection requirements for specific aircraft models to address identified safety issues. AD/BEECH 1900/11 pertains to the Beechcraft 1900 Series Aeroplanes, specifically targeting the fuselage canted bulkhead to prevent potential structural failures due to cracks. This directive was introduced to address the problem of reported cracks in the canted bulkhead of certain Beechcraft 1900 models, which could compromise the structural integrity and operational safety of the aircraft. The policy objective behind this legislation is to ensure that these aircraft meet the necessary safety standards by requiring regular inspections and, where necessary, the installation of specific kits to mitigate identified risks. The Civil Aviation Safety Authority, under the authority of the Civil Aviation Act 1988, issues these directives to enforce compliance with safety regulations. The directive mandates a visual inspection of the canted bulkhead at specified intervals to detect and address any cracks before they affect the aircraft's airworthiness. This proactive approach aims to prevent potential in-flight failures and enhance the overall safety of civil aviation operations within Australia.

Scope and Application

The Civil Aviation Regulations 1998, specifically under Part 39 - 105, govern the application of the Airworthiness Directives for certain aircraft models, with AD/BEECH 1900/11 addressing the Beechcraft 1900 Series Aeroplanes. This directive applies to Beech model 1900, serial numbers UA-1 to UA-3; 1900C, serial numbers UB-1 to UB-74 and UC-1 to UC-174; and 1900D, serial numbers UE-1 to UE-113. The regulation mandates a visual inspection of the fuselage canted bulkhead at fuselage station 588.10, focusing on the outer flange radius at stringer cut outs, lightening holes, and the rudder pulley bracket attach angles, following the guidelines in Beechcraft Service Bulletin 2564, Revision 1. Compliance requires an initial inspection before 5000 hours of time in service or before 200 hours of time in service after 25 May 1995, whichever is later, with subsequent inspections mandated at intervals not exceeding 600 hours of time in service. Installation of Kit 129-4005-1 S exempts the aircraft from the inspection requirements outlined in this directive. The directive is established to prevent potential structural weaknesses and operational issues arising from cracks in the canted bulkhead, which could compromise the aircraft's safety and performance.

Key Provisions

The key operative sections of this legislative instrument (Civil Aviation Regulations 1998, PART 39 - 105) pertain to the maintenance and inspection requirements for specific models of the Beechcraft 1900 series aeroplanes. Section 39.105 outlines the applicability of the Airworthiness Directive (AD/BEECH 1900/11) which mandates specific inspections for the fuselage canted bulkhead. This directive applies to Beech model 1900, serial numbers UA-1 to UA-3; 1900C, serial numbers UB-1 to UB-74 and UC-1 to UC-174; and 1900D, serial numbers UE-1 to UE-113 (section 39.105). The requirement is to visually inspect the entire surface of the canted bulkhead at fuselage station 588.10, with particular attention to the outer flange radius at stringer cut outs, lightening holes, and the rudder pulley bracket attach angles. This inspection must be conducted in accordance with Beechcraft Service Bulletin 2564, Revision 1 (section 39.105). The obligations imposed on the parties or entities governed by this Act include performing the initial inspection before 5000 hours of time in service or before 200 hours of time in service after 25 May 1995, whichever occurs later. Following the initial inspection, subsequent inspections must be conducted at intervals not to exceed 600 hours of time in service (section 39.105). If Kit 129-4005-1 S is installed, the inspection requirements of this directive are cancelled (section 39.105). These provisions are essential for maintaining the structural integrity and safety of the specified Beechcraft 1900 series aeroplanes. Failure to comply with the inspection requirements set out in this directive could result in serious safety issues. The background information provided indicates that the manufacturer has received reports of cracks in the canted bulkhead. If these cracks exceed allowable limits, the residual strength of the bulkhead may be reduced below the certification requirements, potentially leading to a reduction in rudder power. This could compromise the safety and airworthiness of the aircraft. The legislation does not specify particular offences, penalties, or civil/criminal consequences for breach, but non-compliance could result in severe safety risks, potentially leading to enforcement actions by the Civil Aviation Safety Authority. The potential ramifications of such breaches underscore the importance of strict adherence to the outlined inspection requirements.