AD/HS 125/137 - Oxygen System Inspection

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 105, outlines the Airworthiness Directives issued by the Civil Aviation Safety Authority. One such directive, AD/HS 125/137, pertains to the inspection of the oxygen system in British Aerospace BAe 125 Series 1000 aeroplanes. This legislation was enacted to address the safety concern of potential chafing between the nose wheel steering control chain and the oxygen pipe assembly 25-9SF61-125A, which could lead to damage to the oxygen system. This safety issue was identified following reports of such chafing, and the directive mandates action in accordance with the Accomplishment Instructions outlined in Corporate Jets Limited Service Bulletin S.B. 35-36 dated 7 January 1993. The policy objective is to ensure the integrity and safety of the oxygen system on BAe 125 Series 1000 aircraft, thereby mitigating the risk of in-flight emergencies due to compromised oxygen supply. This legislative instrument was created by the Civil Aviation Safety Authority under the authority of the Civil Aviation Act 1988. The directive requires compliance prior to 5 March 1993, as the issue was classified as mandatory by the UK Civil Aviation Authority, with reference to AD 022-01-93 dated 25 January 1993. The overarching goal of this directive is to enhance the safety of air travel by addressing specific mechanical vulnerabilities that could compromise the aircraft’s oxygen system.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, pertains to the Civil Aviation Safety Authority's (CASA) Schedule of Airworthiness Directives, which includes AD/HS 125/137 concerning the inspection of the oxygen system for British Aerospace BAe 125 Series Aeroplanes. This directive applies to all BAe 125 Series 1000 aircraft that are identified in the Corporate Jets Limited Service Bulletin S.B. 35-36 dated 7 January 1993. The requirement outlined in the directive is that action must be taken in accordance with the Accomplishment Instructions of Corporate Jets Limited Service Bulletin S.B. 35-36. This Service Bulletin has been classified as Mandatory by the Civil Aviation Authority in the United Kingdom, with reference to AD 022-01-93 dated 25 January 1993. Compliance with this directive must be achieved prior to 5 March 1993 to prevent damage to the oxygen pipe caused by chafing from the nose wheel steering control chain. This regulation operates within the Commonwealth of Australia, under the jurisdiction of CASA, and affects aircraft operators who own and maintain BAe 125 Series 1000 aeroplanes.

Key Provisions

The main sections of the Civil Aviation Regulations 1998, specifically Part 39 - 105, outline the requirements for the airworthiness directives concerning British Aerospace BAe 125 Series Aeroplanes, particularly the oxygen system inspection directive AD/HS 125/137 (4/93DM). This directive applies to all BAe 125 Series 1000 aircraft as identified in the Corporate Jets Limited Service Bulletin S.B. 35-36 dated 7 January 1993. The directive mandates that the actions specified in the Accomplishment Instructions of the aforementioned service bulletin be taken to ensure compliance. This directive was issued in response to reports of chafing between the nose wheel steering control chain and the oxygen pipe assembly 25-9SF61-125A, which could potentially cause damage to the oxygen system. Adhering to this directive helps prevent such damage and maintains the safety of the aircraft. The obligations imposed by the Civil Aviation Regulations on the parties involved, particularly the aircraft operators, are quite specific. Operators of BAe 125 Series 1000 aircraft must ensure that the oxygen system inspection, as outlined in Corporate Jets Limited Service Bulletin S.B. 35-36, is performed before the compliance date of 5 March 1993. This involves following the Accomplishment Instructions detailed in the service bulletin, which likely include tasks such as inspecting, repairing, or replacing the oxygen pipe assembly to prevent any chafing or damage caused by the nose wheel steering control chain. Operators must document all actions taken to demonstrate compliance with the directive. Breaching the requirements set forth in the Civil Aviation Regulations can result in significant consequences. Failure to comply with airworthiness directives such as AD/HS 125/137 may lead to penalties under the Civil Aviation Act 1988. While the specific penalties for non-compliance with airworthiness directives are not detailed in the text provided, such breaches can generally result in substantial fines, enforcement actions, and potential grounding of the aircraft. In severe cases, there may also be criminal charges and imprisonment for individuals responsible for ensuring compliance. These consequences underscore the importance of adhering to the directives to maintain the safety and airworthiness of the aircraft.