COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
SAAB SF340 Series Aeroplanes
AD/SF340/12 Air Conditioning System Couplings 1/89
Applicability: Model SF 340A with serial numbers -003 through -138.
Requirement: 1. Action in accordance with SAAB Service Bulletin No SF 340-21-022, Accomplishment Instruction (C) (1), (2), and (3).
2. Action in accordance with SAAB SB No SF 340-21-022, Accomplishment Instruction No C (4).
Note: Swedish AD No 1-029 refers.
Compliance: 1. At the next B - check after 26 January 1989.
2. (a) At the next B - check after 26 January 1989; and
(b) any time a Gamah coupling is subsequently removed and installed.
Background: Bleed air leakage in the ACM compartment caused by “Gamah” type coupling separation has resulted in structural damage due to overheated panels with resultant bonding separation between stringers and skin panel.
Overview
The Civil Aviation Regulations 1998, enacted by the Commonwealth of Australia, represent a comprehensive set of rules governing civil aviation safety. Part 39, specifically AD/SF340/12, targets the airworthiness directives for the SAAB SF340 series aeroplanes, addressing issues related to the air conditioning system couplings. This legislation was introduced to rectify the problem of bleed air leakage in the Aircraft Conditioning Module (ACM) compartment, caused by the separation of "Gamah" type couplings, which has led to structural damage due to overheating and bonding separation between stringers and skin panels. The directive is mandated by the Civil Aviation Safety Authority and requires compliance with SAAB Service Bulletin No SF 340-21-022, ensuring the implementation of specific accomplishment instructions to mitigate the identified risks.
The policy objective behind AD/SF340/12 is to enhance the safety and reliability of SAAB SF340 series aeroplanes by enforcing stringent maintenance and inspection protocols. This includes performing necessary actions at scheduled B-checks and any time a Gamah coupling is removed and reinstalled, thereby preventing potential structural failures and ensuring continued airworthiness. Compliance with these directives is essential to safeguard the structural integrity of the aircraft and protect the safety of passengers and crew.
Scope and Application
The Civil Aviation Regulations 1998, specifically PART 39 - 105, mandates airworthiness directives for ensuring the safety and reliability of aircraft within the Commonwealth of Australia. This legislation applies to Saab SF340 Series aeroplanes, specifically model SF 340A with serial numbers ranging from -003 to -138. The directive is concerned with the air conditioning system couplings and requires compliance with SAAB Service Bulletin No SF 340-21-022, detailing specific accomplishment instructions to address known issues with “Gamah” type couplings. The primary concern addressed by this regulation is the risk of bleed air leakage in the Air Conditioning System (ACS) compartment, which has previously led to structural damage due to overheating and resultant bonding separation between stringers and skin panels. Compliance with this directive is mandatory and must be completed at the next B-check following 26 January 1989 and any subsequent time a Gamah coupling is removed and reinstalled. This regulation does not explicitly exclude any entities or extend its application beyond the specified model and serial numbers of the Saab SF340A aeroplanes.
Key Provisions
The Civil Aviation Regulations 1998, specifically Part 39 - 105, establish the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, which includes AD/SF340/12 concerning the air conditioning system couplings of the SAAB SF340 Series aeroplanes. This directive applies to the model SF 340A with serial numbers ranging from -003 through -138 (Section 1). The main requirements outlined in this directive mandate actions in accordance with SAAB Service Bulletin No SF 340-21-022, focusing on Accomplishment Instructions (C) (1), (2), and (3) and Accomplishment Instruction No C (4) (Section 1). These actions are intended to address issues such as bleed air leakage in the ACM compartment, which has been caused by the separation of "Gamah" type couplings. Such separations have resulted in structural damage due to overheated panels and bonding separation between stringers and skin panels (Section 1).
The obligations imposed by the AD/SF340/12 directive require compliance at specific intervals. Firstly, compliance must be achieved at the next B-check following 26 January 1989. Secondly, if a Gamah coupling is removed and reinstalled at any time, compliance must be re-established (Section 2). This ensures that any replacement or servicing of the couplings adheres to the safety guidelines set out in the directive. Swedish AD No 1-029 is referenced as an additional source of guidance for compliance (Section 2).
Failure to comply with the AD/SF340/12 directive can lead to significant consequences. The primary concern is the potential for structural damage to the aeroplane, which could compromise flight safety. While the specific legal penalties are not detailed in the provided text, non-compliance with CASA directives typically results in enforcement actions, which can include fines, suspension of airworthiness certificates, or other regulatory sanctions. The severity of the consequences depends on the nature and extent of the non-compliance, as well as any resultant safety risks (Section 3).
In summary, the AD/SF340/12 directive mandates specific actions to address the issue of air conditioning system couplings in SAAB SF340 Series aeroplanes. Compliance is required at the next B-check after 26 January 1989 and any subsequent time a Gamah coupling is removed and reinstalled. Non-compliance may lead to severe safety risks and regulatory penalties. Operators and maintenance personnel must ensure adherence to these requirements to maintain the airworthiness and safety of the affected aircraft.