AD/CON/73 - Unapproved Camshaft Repairs

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 106, which governs the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, was enacted to ensure the safety of air operations within Australia. This legislation is instrumental in maintaining the airworthiness of aircraft by issuing directives that address identified safety issues. One such directive, AD/CON/73, pertains to Teledyne Continental Motors piston engines, particularly those with camshafts repaired by Wades Camshafts Pty Ltd prior to 31 October 1994. The directive was introduced to address concerns about the repair procedures of these camshafts, which had been found to be contrary to the requirements set forth in CAO 106, AD/ENG/4 Amdt. 3, Paragraph 2.4. The policy objective here is to ensure that any repairs do not compromise the structural integrity or operational safety of the engines, thereby maintaining the overall airworthiness of affected aircraft. This directive was issued by the Civil Aviation Safety Authority following evaluations at their Materials Evaluation Facility in Canberra, which confirmed that the Wades Camshafts repair procedure does not adversely affect the airworthiness of the camshafts in question.

Scope and Application

The Civil Aviation Regulations 1998, as amended, specifically under PART 39 - 106 Civil Aviation Safety Authority Schedule of Airworthiness Directives, mandates the inspection of Teledyne Continental Motors piston engine camshafts that were repaired by Wades Camshafts Pty Ltd, North Melbourne, Victoria, prior to 31 October 1994. This directive, identified as AD/CON/73 Unapproved Camshaft Repairs, applies to all such camshafts and requires that they be inspected for lobe profile, lobe dimensions, and grinding stress induced thermal cracks in accordance with an approved procedure as outlined in CAR 35. The requirement aims to ensure the airworthiness of these camshafts, which may remain in service until they are next accessed for an engine overhaul or bulk strip. The directive came into effect on 2 March 1995, underscoring the need for timely compliance by the relevant parties to maintain safety standards within the aviation industry. The directive is an example of the Civil Aviation Safety Authority's commitment to addressing non-compliant repairs and ensuring that all components meet the necessary safety standards.

Key Provisions

The Civil Aviation Regulations 1998, specifically PART 39 - 106, addresses the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, with AD/CON/73 concerning Teledyne Continental Motors Piston Engines. This directive is focused on unapproved camshaft repairs performed by Wades Camshafts Pty Ltd in North Melbourne, Victoria, before 31 October 1994. According to section (3/95) of this directive, the requirement is to inspect the applicable camshafts for lobe profile, lobe dimensions, and stress-induced thermal cracks. These inspections must be carried out in accordance with an approved CAR 35 camshaft repair procedure. The directive became effective on 2 March 1995, and it mandates that installed camshafts be inspected at the next engine overhaul or bulk strip, whichever comes first. For spare camshafts, the inspection must occur before they are installed in an engine. In terms of obligations, entities governed by this directive are required to ensure that camshafts repaired by Wades Camshafts Pty Ltd before the specified date are inspected in line with the outlined requirements. This involves using a CAR 35 approved procedure to examine the camshafts for the aforementioned issues. The inspection must be thorough and follow the stipulated guidelines to maintain airworthiness. Failure to comply with these inspection requirements could result in non-compliance with civil aviation regulations, potentially leading to operational restrictions or grounding of the affected aircraft until the required inspections are performed. There are no explicit offences or penalties outlined in the directive itself; however, non-compliance with CASA directives can have serious ramifications under the broader Civil Aviation Act 1988 and the Civil Aviation Regulations 1998. These can include significant fines and potential legal action against the non-compliant entity. Additionally, operational safety risks are heightened if the specified inspections are not conducted, which could result in accidents or other safety incidents. The consequences for failing to adhere to these directives can therefore be severe, both in terms of regulatory penalties and the potential impact on aviation safety.