AD/HS 125/102 Amdt 1 - Warming Ovens

Overview

The Civil Aviation Regulations 1998 (Cth), administered by the Civil Aviation Safety Authority, were enacted to ensure the safety and efficiency of civil aviation in Australia. Part 39, specifically Schedule of Airworthiness Directives, includes AD/HS 125/102 Amendment 1, addressing the issue of thermal runaway in the warming ovens of British Aerospace BAe 125 Series Aeroplanes. This legislation was enacted to mitigate the risk of thermal runaway by requiring the replacement of specific warming ovens with upgraded versions. The policy objective behind this directive is to enhance aviation safety by preventing potential overheating and associated risks in aircraft equipment. This legislative instrument was issued under the authority of the Civil Aviation Act 1988, reflecting the Commonwealth of Australia’s commitment to maintaining stringent safety standards in civil aviation. The requirement to replace certain warming ovens with improved models aims to address identified safety deficiencies and ensure continued compliance with international safety standards set by the UK Civil Aviation Authority. The compliance date for these changes was set to ensure that all affected aircraft would be updated in a timely manner, minimising potential safety risks.

Scope and Application

The Civil Aviation Regulations 1998, as part of the Australian Commonwealth's legislative framework, apply to all BAe 125 series aircraft that are fitted with specific warming ovens, namely part numbers 255B-LH-28/115, 255B-RH-28/115, and 255-362. This legislation mandates the replacement of these warming ovens with newer models, specifically part numbers 255D-LH-28/115, 255D-RH-28/115, or 255-362A, to address instances of thermal runaway that have occurred in the older models. The applicability of these regulations extends to all aircraft that meet the specified criteria, regardless of the location of operation within Australia. The legislation is in line with a directive issued by the UK Civil Aviation Authority and is classified as mandatory. Compliance with these safety directives is essential, with the requirement becoming effective from 5 September 1991.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, includes detailed provisions related to airworthiness directives that must be followed for certain types of aircraft. This particular section, AD/HS 125/102 Amendment 1, applies to all British Aerospace (BAe) 125 series aeroplanes that are equipped with warming ovens bearing the part numbers 255B-LH-28/115, 255B-RH-28/115, and/or 255-362 (section 1). The primary requirement of this directive is the replacement of these existing warming ovens with newer models that have part numbers 255D-LH-28/115, 255D-RH-28/115, or 255-362A, respectively, in order to mitigate the risk of thermal runaway, a dangerous malfunction that has previously occurred (section 2). Operators and owners of BAe 125 series aircraft that meet the criteria outlined in the directive must ensure that the specified warming ovens are replaced as mandated. This involves a thorough inspection of the aircraft to identify the relevant warming ovens and arranging for their replacement with the designated new parts (section 3). This requirement is deemed mandatory by the UK Civil Aviation Authority and must be adhered to by all parties subject to the directive to maintain the airworthiness of the aircraft (section 4). Failure to comply with the airworthiness directive may lead to severe consequences. The Civil Aviation Safety Authority (CASA) may take enforcement actions against non-compliance, which can include fines or other penalties as stipulated under the Civil Aviation Act 1988. The exact nature and severity of the penalties depend on the specific circumstances of the non-compliance, but they can include substantial financial penalties, suspension or revocation of air operator certificates, or other regulatory sanctions (section 5). The compliance date for this directive revision is set as 5 September 1991, and it is crucial for operators to ensure that all necessary changes are made by this date to avoid any legal repercussions (section 6).