AD/VAT/33 - Control Column Bearing Spigot Bolt - Inspection

Overview

The Civil Aviation Regulations 1998, enacted by the Australian Parliament, provide comprehensive guidelines and regulations to ensure the safety and efficiency of civil aviation within Australia. Specifically, Part 39 of these regulations addresses Airworthiness Directives, which are legally enforceable rules relating to design, construction, maintenance, and operation of aircraft to ensure their continued airworthiness. The Civil Aviation Regulations 1998 were introduced to fill the need for a cohesive and enforceable framework to govern the aviation industry, ensuring that all aircraft operations meet stringent safety standards. This legislation aims to protect the public and maintain high safety standards within Australia's civil aviation sector, reflecting the overarching policy objective of safeguarding lives and property in the aviation domain. One specific directive under these regulations is AD/VAT/33, which pertains to Victa and A.E.S.L. Airtourer Series Aeroplanes. This directive mandates the inspection of the control column torque tube near the bearing spigot bolt for Airtourer 100 and 115 models, ensuring that the components conform to specified threadform and dimensional standards. The directive is designed to maintain the structural integrity of the aircraft, preventing potential failure that could compromise flight safety. Compliance with this directive must be achieved within 100 hours of time in service after the directive's issuance date or before installation, whichever comes first, ensuring timely adherence to safety requirements.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, which includes Airworthiness Directives, applies to Victa and A.E.S.L. Airtourer Series aeroplanes, namely the Airtourer 100 and 115 models. This legislation mandates the inspection of the control column torque tube near the bearing spigot bolt, identified as P/N 31724/1, to ensure it conforms to the specified 6/15-24 WNF-2A threadform. The inspection requirement is critical as it ensures the outside diameter of the thread must be a minimum of 0.3042 inches and the root diameter a minimum of 0.2536 inches. Compliance with this directive is mandatory within 100 hours of time in service after the date of issue, 6 October 1968, or before installation if the aeroplane is brought into service after this date. This regulation operates under the purview of the Commonwealth of Australia and is enforced by the Civil Aviation Safety Authority. The application of this directive is specific to the mentioned aircraft models and does not extend to other aircraft types unless specified by additional directives or amendments.

Key Provisions

The Civil Aviation Regulations 1998, specifically in Part 39 - 105, detail provisions under the Civil Aviation Safety Authority (CASA) that govern the airworthiness directives for particular aircraft models, such as the Victa and A.E.S.L. Airtourer Series Aeroplanes. AD/VAT/33 is an airworthiness directive concerning the control column bearing spigot bolt of the Airtourer 100 and 115 models. According to section (10/68), the requirement is to inspect the control column torque tube near the bearing spigot bolt, identified by part number 31724/1, to ensure it conforms with the 6/15-24 WNF-2A threadform. The inspection must confirm that the outside diameter of this thread is a minimum of 0.3042 inches, and the root diameter is a minimum of 0.2536 inches. This inspection must occur within 100 hours of the aircraft's time in service after 6 October 1968 or before the aircraft is installed after this date, whichever comes first. Under this directive, the obligations imposed on the operators of Airtourer 100 and 115 aircraft are clear: they must ensure that the specified inspection is conducted within the stipulated timeframe. This requirement is intended to maintain the safety standards of the aircraft by verifying the structural integrity of the control column torque tube, which is critical for the aircraft's flight control system. The directive ensures that any deviations from the specified threadform could potentially compromise the safety of the aircraft, necessitating timely and accurate inspections. Failure to comply with the provisions outlined in AD/VAT/33 could have significant consequences. While the specific penalties are not detailed in the provided text, non-compliance with CASA directives generally can lead to enforcement actions. These may include fines, orders for corrective action, or even grounding of the aircraft until the required inspections and repairs are satisfactorily completed. Such stringent measures underscore the importance of adhering to the airworthiness directives to ensure the safety and reliability of civil aviation operations.