AD/HU 269/85 Amdt 2 - Tail Rotor Blade Abrasion Strip

Overview

The Civil Aviation Regulations 1998, as amended, include the PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITYSCHEDULE OF AIRWORTHINESS DIRECTIVES, which was enacted to address safety issues in civil aviation, specifically for Schweizer (Hughes) 269 Series Helicopters. The legislation was enacted by the Commonwealth of Australia and is overseen by the Civil Aviation Safety Authority (CASA). The primary policy objective of this legislation is to ensure the airworthiness of aircraft by mandating specific safety directives, including modifications and inspections of certain components to prevent accidents and ensure the safety of all persons on board. The regulations aim to mitigate risks associated with identified safety issues, such as the separation of abrasion strips from tail rotor blade skins, which could potentially lead to loss of control of the aircraft.

Scope and Application

The Civil Aviation Regulations 1998, as amended, apply to all Schweizer (Hughes) 269 series helicopters certified in any category and equipped with 269A6035 series tail rotor blades manufactured before 15 September 1989. This regulation is enforced by the Civil Aviation Safety Authority (CASA) and pertains to modifications and inspections of the tail rotor blades to prevent potential safety hazards. The requirements include modifying specific tail rotor blades with certain serial numbers, modifying all tail rotor blades except those already modified according to certain procedures, and conducting visual inspections for any evidence of cracking or chipping in the abrasion strip. Blades manufactured by Schweizer with a bond date on or after 15 September 1989 are exempt from these requirements. Compliance must be ensured prior to further flight after 10 April 1991, within 100 hours of time in service, and at each daily inspection. This directive is critical to maintaining airworthiness and must be documented on the Maintenance Release.

Key Provisions

The Civil Aviation Regulations 1998, particularly PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES, section Schweizer (Hughes) 269 Series Helicopters AD/HU 269/85 Amdt 2, addresses the modification of tail rotor blades for certain Schweizer (Hughes) 269 series helicopters. Specifically, section 1 identifies the applicability of this directive to all models of 269 series helicopters, certified in any category, equipped with 269A6035 series tail rotor blades manufactured before 15 September 1989. The directive mandates actions in accordance with FAA AD 89-20-03 R1, which includes modifying the affected tail rotor blades with specific serial numbers in accordance with the procedures detailed in Schweizer SIN N-183.3 Part III. Furthermore, section 2 requires the modification of all other tail rotor blades, whether manufactured by Schweizer or Hughes, except those specified in Requirement 1, also in accordance with the procedures in Schweizer SIN N-183.3 Part III. Section 3 necessitates a visual inspection of the abrasion strip of these blades for any evidence of cracking or chipping along the entire abrasion strip/airfoil bond line and the blade tip. The obligations imposed by the Civil Aviation Regulations 1998 on the parties governed by this directive include ensuring that the modifications and inspections are carried out as specified. Operators of affected helicopters must adhere to the procedural requirements outlined in Schweizer SIN N-183.3 Part III for modifying the specified tail rotor blades. Additionally, they must visually inspect all tail rotor blades for any signs of cracking or chipping and, if detected, conduct a more thorough inspection using a magnifying glass, dye penetrant, or equivalent inspection methods to check for bond separation. If bond separation is found, the rotor blade must be removed from service prior to further flight. The directive also mandates that compliance with these requirements must be documented on the Maintenance Release as maintenance required. Failure to comply with the provisions of the Civil Aviation Regulations 1998, specifically the requirements of this Airworthiness Directive, can lead to serious consequences. Although the specific penalties for non-compliance are not detailed in the text, it is likely that violations could result in fines, legal action, or other regulatory penalties. Additionally, operating a helicopter that does not comply with these airworthiness directives could result in the aircraft being grounded, potentially leading to significant operational disruptions and safety risks. The potential civil and criminal consequences of non-compliance underscore the importance of adhering to the specified requirements to maintain the airworthiness and safety of the aircraft.