COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Enstrom F-28 Series Helicopters
AD/ENST 28/31 Main Rotor Transmission Clutch Assembly 5/89
DM
Applicability: All model F28 series helicopters equipped with P/N 28- 13401-1, Formsprag CL 40526-1 through -7 main rotor transmission clutch assembly.
Requirement: Action in accordance with Enstrom Service Directive Bulletin No 0068. Additionally, for F-28F, F280F and 280FX helicopters inspect clutch assembly for part number. If clutch P/N 28- 13401-1 fitted, replace with clutch P/N 28-13401-2 before further flight.
Note: FAA AD 89-04-09 refers.
Compliance: At next inspection for issue of a Maintenance Release or by 31 March 1989 whichever occurs first.
Background: Failure of the 28-13401-1 clutch has resulted in severe damage to helicopters.
Overview
The Civil Aviation Regulations 1998, enacted by the Australian Government, establish comprehensive regulations for civil aviation safety within Australia. Part 39 of these regulations specifically addresses airworthiness directives to ensure the safe operation of aircraft. One such directive, AD/ENST 28/31, was introduced to address the identified problem of clutch failures in Enstrom F-28 Series Helicopters. This directive was necessitated by incidents where the failure of the main rotor transmission clutch assembly, part number 28-13401-1, resulted in significant damage to the helicopters. The policy objective is to enhance the safety of helicopter operations by mandating the replacement of the specified clutch assembly in certain Enstrom F-28 series models to prevent further failures and potential accidents. Compliance with this directive is required by the next inspection for a Maintenance Release or by a specified deadline of 31 March 1989, ensuring timely and effective implementation of the safety measures.
Scope and Application
The Civil Aviation Regulations 1998, specifically Part 39 - 105, mandates airworthiness directives that apply to all model F28 series helicopters equipped with specific parts of the main rotor transmission clutch assembly. This legislation applies to a narrow scope of aircraft, namely those with P/N 28-13401-1, Formsprag CL 40526-1 through -7 main rotor transmission clutch assemblies. The primary requirement under this directive is that operators must comply with Enstrom Service Directive Bulletin No 0068, which entails replacing the specified clutch part number 28-13401-1 with 28-13401-2 for F-28F, F280F, and 280FX helicopters. This action must be completed either at the next inspection for the issuance of a maintenance release or by 31 March 1989, whichever comes first. The directive extends across the Commonwealth of Australia, administered by the Civil Aviation Safety Authority, ensuring uniformity in airworthiness standards across all states and territories. The regulation does not specify any exclusions or exemptions, leaving no room for selective application based on operational or geographic factors.
Key Provisions
The Civil Aviation Regulations 1998, specifically under PART 39 - 105, mandate certain safety directives for aircraft, including the Enstrom F-28 Series Helicopters, through the Civil Aviation Safety Authority Schedule of Airworthiness Directives. Section AD/ENST 28/31 focuses on the Main Rotor Transmission Clutch Assembly. This directive applies to all model F28 series helicopters equipped with the specific Formsprag CL 40526-1 through -7 main rotor transmission clutch assembly, identified by the part number 28-13401-1 (Section 5/89). The directive requires operators to follow the action stipulated in Enstrom Service Directive Bulletin No 0068. For F-28F, F280F, and 280FX helicopters, operators must inspect the clutch assembly to determine if the clutch part number 28-13401-1 is fitted. If it is, it must be replaced with clutch part number 28-13401-2 before any further flight. The directive references FAA AD 89-04-09 for additional context (Section 5/89).
Compliance with these directives is mandatory. Operators must adhere to the compliance schedule, which requires the necessary actions to be completed at the next inspection before issuing a Maintenance Release, or by 31 March 1989, whichever comes first (Section 5/89). This ensures that any identified issues with the clutch assembly are rectified in a timely manner to prevent potential safety hazards. Failure to comply with these requirements can result in significant risks, including severe damage to the helicopters, as highlighted in the background information.
The regulations impose specific obligations on the operators and maintenance personnel of the Enstrom F-28 Series Helicopters. These obligations include conducting thorough inspections of the clutch assembly as directed, identifying any parts that need replacement, and ensuring that the replacement parts are correctly fitted before further operation of the aircraft. This is to mitigate the risk of failure that has been previously observed with the 28-13401-1 clutch (Section 5/89). Additionally, operators must keep accurate records of all inspections and maintenance actions performed, ensuring traceability and accountability for compliance with the airworthiness directive.
Failure to comply with the requirements set out in the Civil Aviation Regulations 1998 can lead to significant consequences. The Civil Aviation Safety Authority can impose penalties on operators and maintenance personnel who do not adhere to the airworthiness directives. These penalties may include fines, suspension or revocation of airworthiness certificates, or other administrative actions as deemed necessary by the regulatory authority. In severe cases, non-compliance could also result in criminal charges, leading to substantial fines or imprisonment, depending on the severity of the breach and its impact on aviation safety. The specific penalties are outlined in the Civil Aviation Regulations 1998, but the potential consequences underscore the importance of strict adherence to these safety directives.