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.
Cessna 120 and 140 Series Aeroplanes
AD/CESSNA 120/4 Aileron Support Ribs 5/2003
Applicability: Model 120 and 140 aircraft, serial numbers 8001 through 10209.
Requirement: Inspect the aileron support ribs for indications of buckling or cracking, particularly in the narrow part of the web at the aft edge of the lightening hole and in the top flange just forward of the doubler plate. Replace any damaged support rib with Cessna parts 0422200-2 (left) and 0422200-3 (right), which are made of 0.051- inch material and have a shorter lightening hole.
Note: FAA AD 47-43-06 and Cessna Service Letter No. 46 refers.
Compliance: Within 100 hours time in service or 12 months after 15 May 2003, whichever occurs first, and thereafter at intervals not to exceed 100 hours; and whenever the aircraft is tied down and subjected to high winds without the controls having been locked; until Cessna parts 0422200-2 and 0422200-3 are installed.
This Airworthiness Directive becomes effective on 15 May 2003.
Background: The FAA requires inspection of the aileron support ribs until modified.
David Alan Villiers
Delegate of the Civil Aviation Safety Authority 4 April 2003
The above AD is notified in the Commonwealth of Australia Gazette on 23 April 2003.
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Overview
The Civil Aviation Safety Regulations 1998 (CASR 1998) were enacted to ensure the safety of civil aviation within Australia. The regulations provide a comprehensive framework for regulating the safety aspects of civil aviation, including the issuance of airworthiness directives by the Civil Aviation Safety Authority (CASA). The AD/CESSNA 120/4 Airworthiness Directive issued under CASR 1998 addresses the identified issue of potential buckling or cracking in the aileron support ribs of Cessna 120 and 140 Series Aeroplanes. This directive was issued to ensure that the identified safety concern is rectified in a timely manner, thereby mitigating any associated risks. The AD/CESSNA 120/4 requires inspection and replacement of the aileron support ribs of applicable aircraft models to maintain their airworthiness, and it aims to prevent potential safety hazards related to the structural integrity of the aircraft.
Scope and Application
The Civil Aviation Safety Regulations 1998, specifically Part 39 - 105, pertains to Airworthiness Directives issued by the Civil Aviation Safety Authority (CASA) in Australia. This particular Airworthiness Directive (AD) applies to Cessna 120 and 140 series aeroplanes, with serial numbers ranging from 8001 to 10209. The AD mandates that the aileron support ribs of these aircraft must be inspected for indications of buckling or cracking, particularly in the narrow part of the web at the aft edge of the lightening hole and in the top flange just forward of the doubler plate. Any damaged support ribs must be replaced with specific Cessna parts made of 0.051-inch material and having a shorter lightening hole. The requirement to comply with this AD must be met within 100 hours of time in service or 12 months after the AD was issued, whichever occurs first, and then at intervals not exceeding 100 hours, and whenever the aircraft is tied down and subjected to high winds without the controls being locked, until the specified Cessna parts are installed. This AD was issued under subregulation 39.1 (1) of the CASR 1998 and aligns with FAA AD 47-43-06 and Cessna Service Letter No. 46. The AD became effective on 15 May 2003, and its notification was published in the Commonwealth of Australia Gazette on 23 April 2003.
Key Provisions
The Civil Aviation Safety Regulations 1998, specifically Part 39 - 105, outline the Civil Aviation Safety Authority's (CASA) requirements for airworthiness directives. Section 39.1(1) allows a CASA delegate to issue Airworthiness Directives (AD) when necessary to address unsafe conditions. For the Cessna 120 and 140 series aeroplanes, AD/CESSNA 120/4 mandates the inspection and replacement of aileron support ribs to prevent buckling or cracking, particularly in certain areas of the rib structure (CASR 1998, Part 39 - 105). The directive applies to aircraft with serial numbers between 8001 and 10209.
The obligations imposed by this AD include conducting thorough inspections of the aileron support ribs, focusing on specific areas prone to damage. If any rib shows signs of buckling or cracking, it must be replaced with approved Cessna parts 0422200-2 and 0422200-3, which are made of specified material and have a shorter lightening hole (CASR 1998, Part 39 - 105). The compliance timeline requires these inspections to be performed within 100 hours of service or within 12 months from 15 May 2003, whichever comes first, and then at intervals not exceeding 100 hours. Additionally, inspections must be carried out whenever the aircraft is tied down and exposed to high winds without the controls being locked.
Failure to comply with this AD may result in severe consequences, including potential safety risks and legal penalties. The directive clearly states that non-compliance can lead to the continued operation of aircraft with unsafe conditions, which could result in serious accidents. The maximum penalties for such violations may include substantial fines and, in severe cases, potential criminal charges against responsible parties. Ensuring adherence to these ADs is critical for maintaining the safety and airworthiness of the aircraft.