COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
De Havilland DHC-1 (Chipmunk) Series Aeroplanes
AD/DHC-1/11 Elevator Trim Tab Cable - Inspection 12/57
Applicability: All models.
Requirement: Inspect the elevator trim tab cable, P/N C1/CF351A, for fraying, corrosion or excessive wear as follows:
(a) Cables which have been in operation less than 300 hours flying time:
Remove the rear seat and visually inspect that length of cable which passes around the trim tab drum during the full range of tab operation.
(b) Cables which have been in operation for 300 hours or more flying time: Unwrap the cable from the drum and inspect, by flexing, for broken wires and other defects. Pay particular attention to the section of cable which passes over the drum and the area adjacent to the locating peg. or
ANO 105.1.14.15.6.5.
Compliance: At intervals not exceeding 100 hours time in service.
Overview
The Civil Aviation Regulations 1998 (CAR 1998) were enacted to ensure the safety of civil aviation in Australia, addressing the need for stringent regulations to govern the airworthiness and operation of aircraft. Part 39, in particular, focuses on the authority and responsibilities of the Civil Aviation Safety Authority (CASA) in issuing directives to maintain aircraft safety standards. The 1998 Regulations were introduced by the Australian Parliament to consolidate and modernise civil aviation laws, providing a comprehensive framework for the safety oversight of the aviation industry. The policy objective behind these regulations is to ensure that all aircraft operating in Australia meet high safety standards, thereby protecting the public and maintaining the integrity of the national airspace.
One specific directive under these regulations is AD/DHC-1/11, which pertains to the inspection of elevator trim tab cables for De Havilland DHC-1 (Chipmunk) series aeroplanes. This directive mandates that cables be inspected for fraying, corrosion, or excessive wear at regular intervals, depending on the flying time of the aircraft. The directive aims to prevent potential failures of the elevator trim tab cables, which could compromise the aircraft's control and safety. By enforcing these inspection requirements, CASA seeks to mitigate risks associated with cable degradation, ensuring that the aircraft remain airworthy throughout their operational life.
Scope and Application
The Civil Aviation Regulations 1998, specifically under Part 39 - 105, applies to all models of De Havilland DHC-1 (Chipmunk) Series aeroplanes within the Commonwealth of Australia. This legislation mandates the inspection of the elevator trim tab cable, P/N C1/CF351A, to ensure its airworthiness. The requirement stipulates that for cables which have been in operation for less than 300 hours, a visual inspection should be conducted by removing the rear seat and observing the cable as it passes around the trim tab drum during full operation. For cables that have been in operation for 300 hours or more, the cable should be unwrapped from the drum and physically flexed to check for broken wires and other defects, with a particular focus on the section of cable passing over the drum and the area adjacent to the locating peg. Compliance with these directives must occur at intervals not exceeding 100 hours of time in service. The scope of this regulation is strictly limited to the specified models and the outlined inspection procedures, with no exclusions or exemptions mentioned in the provided text.
Key Provisions
The Civil Aviation Regulations 1998, under Part 39 - 105, include specific provisions for the airworthiness of the De Havilland DHC-1 (Chipmunk) Series Aeroplanes, particularly focusing on the inspection of the elevator trim tab cable. Section AD/DHC-1/11 outlines the mandatory inspection requirements for this cable (section 12/57). These requirements are applicable to all models of the Chipmunk aircraft. The primary task involves inspecting the elevator trim tab cable, identified by part number C1/CF351A, for signs of fraying, corrosion, or excessive wear.
The inspection procedures vary depending on the flying time of the cables. For cables that have been in operation for less than 300 hours, the rear seat must be removed to visually inspect the cable as it passes around the trim tab drum during full range of tab operation. Conversely, for cables that have accumulated 300 hours or more of flying time, the cable must be unwrapped from the drum and inspected by flexing it. This process necessitates paying close attention to the section of the cable passing over the drum and the area near the locating peg.
Compliance with these inspection requirements is critical and must be adhered to at intervals not exceeding 100 hours of time in service. Failure to comply with these stipulations could potentially compromise the safety and airworthiness of the aircraft, leading to serious operational risks.
Breaches of these regulations can lead to various consequences, including enforcement actions by the Civil Aviation Safety Authority (CASA). The penalties for non-compliance may vary, but they can include fines and other legal repercussions. The exact penalties are determined by the nature and severity of the breach, but they can be substantial, reflecting the importance of maintaining airworthiness standards to ensure public safety.
In summary, the Civil Aviation Regulations 1998 mandate rigorous inspection protocols for the elevator trim tab cables of De Havilland DHC-1 (Chipmunk) Series Aeroplanes to ensure ongoing airworthiness. Compliance with these regulations is mandatory and must be strictly observed to prevent safety risks. Non-compliance can result in significant penalties, underscoring the importance of adhering to these safety directives.