COMMONWEALTH OF AUSTRALIA (Civil Aviation Safety Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.
Learjet 45 Series Aeroplanes
AD/LJ45/6 Horizontal Stabiliser Actuator Assembly 10/2003
TX
Applicability: All Learjet Model 45 series aeroplanes fitted with Horizontal Stabilizer Actuator Assembly (HSAA) Part Number (P/N) 6627401000-005.
Requirement: 1. Remove from service HSAA P/N 6627401000-005.
2. Do not install HSAA P/N 6627401000-005 on any aeroplane as a replacement part.
Note 1: FAA AD 2003-16-19 Amdt 39-13272 refers.
Note 2: At the time of this Directive there are no replacement HSAA’s approved for fitment to the aeroplane.
Note 3: AD/LJ45/5 required fitment of HSAA P/N 6627401000-005 as a replacement part for P/N 6627401000-001 or 2A9200F HSAA’s. This Directive augments those requirements.
Compliance: For Requirement 1: Before further flight as of the effective date of this Directive.
For Requirement 2: As of the effective date of this Directive.
This Airworthiness Directive becomes effective on 15 August 2003.
Background: The HSAA P/N 6627401000-005 was not manufactured to the type design data. A brittle fracture could occur on the acme screw and nut within the assembly that could result in a loss of control of the aeroplane.
Jim Coyne
Delegate of the Civil Aviation Safety Authority 14 August 2003
The above AD is notified in the Commonwealth of Australia Gazette on 15 August 2003.
Overview
The Civil Aviation Safety Regulations 1998, administered by the Civil Aviation Safety Authority (CASA), include a provision for issuing Airworthiness Directives (AD) to address identified safety concerns with aircraft. In response to a critical safety issue with the horizontal stabiliser actuator assembly in Learjet 45 series aeroplanes, CASA issued AD/LJ45/6 on 14 August 2003. This directive mandates the removal of the Horizontal Stabiliser Actuator Assembly (HSAA) part number 6627401000-005 and prohibits its installation as a replacement part due to a risk of brittle fracture, which could lead to loss of control. The directive was enacted to mitigate this specific safety risk and was effective as of 15 August 2003.
Scope and Application
The Civil Aviation Safety Regulations 1998, under the legislative instrument F2006B11167, establish stringent safety standards for the operation of aircraft within Australia. Specifically, Part 39 - 105 of these regulations includes Airworthiness Directives (ADs) that mandate corrective actions to address unsafe conditions identified in particular aircraft or aeronautical products. The scope of this particular AD applies to all Learjet Model 45 series aeroplanes equipped with a Horizontal Stabilizer Actuator Assembly (HSAA) of Part Number (P/N) 6627401000-005. The directive necessitates the removal of this HSAA from service and prohibits its installation on any aeroplane as a replacement part due to manufacturing deviations that could lead to a brittle fracture, potentially causing a loss of control. This AD is issued by a delegate of the Civil Aviation Safety Authority (CASA) and becomes effective from 15 August 2003, with compliance required before further flights are undertaken. Notably, there are no approved replacement HSAAs available at the time of this directive. The AD extends to the Commonwealth of Australia, ensuring consistent enforcement and compliance across the nation's airspace.
Key Provisions
The Civil Aviation Safety Regulations 1998, Part 39 - 105, under the Civil Aviation Safety Authority Schedule of Airworthiness Directives, mandates specific actions to address safety concerns for certain aircraft. This particular Airworthiness Directive (AD) applies to all Learjet Model 45 series aeroplanes equipped with a Horizontal Stabilizer Actuator Assembly (HSAA) bearing Part Number (P/N) 6627401000-005. The directive, issued under subregulation 39.1 (1) of CASR 1998, demands that these aircraft must be removed from service and the specified HSAA must not be reinstalled as a replacement part. The directive also references FAA AD 2003-16-19 Amdt 39-13272 and notes that at the time of issuance, there are no approved replacement HSAAs for the Learjet 45 series.
The obligations imposed by this AD require aircraft operators to comply with the directive's stipulations without delay. Specifically, operators must remove the HSAA P/N 6627401000-005 from service before any further flight, as of the directive's effective date, 15 August 2003. Additionally, operators are prohibited from installing this specific HSAA as a replacement part in any Learjet 45 series aeroplane, effective immediately upon the directive's issuance. This ensures that the identified safety hazard is addressed promptly and effectively.
Failure to comply with the AD can result in severe consequences. Although the specific penalties are not detailed in the text provided, breaches of airworthiness directives under CASR 1998 can lead to civil and criminal penalties, including fines and imprisonment. The severity of these penalties underscores the importance of adhering to the AD to ensure the safety of aviation operations. The directive's strict compliance requirements reflect the regulatory body's commitment to maintaining high safety standards within the aviation industry.