COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
British Aerospace BAe 125 Series Aeroplanes
AD/HS 125/142 Flightdeck Six Volt Lighting Electrical Power 5/94
Applicability: All series 600A, 600B, 700A and 700B aircraft, without Modification 253544A&B incorporated.
Requirement: Incorporate Modification No 253544A&B in accordance with Hawker Raytheon Corporate Jets Service Bulletin (Modification) SB.24-310-3544A&B dated
14 February 1994.
Note: This Service Bulletin has been classified as Mandatory by the CAA(UK).
Compliance: Prior to 31 January 1995.
Background: Hawker Raytheon Corporate Jets have advised of an incident, where a wire from the 6V output of the flightdeck lighting transformer on electrical panel `RY’, short circuited to ground causing a small amount of smoke on the flightdeck. Investigation revealed that the 6V output from the transformer was inadequately protected. This directive requires the installation of two circuit breakers to protect the 6V lighting circuits.
Overview
The Civil Aviation Regulations 1998, under Part 39 - 105, includes an Airworthiness Directive (AD) aimed at addressing safety concerns related to the British Aerospace BAe 125 Series Aeroplanes. Specifically, AD/HS 125/142 targets the flightdeck six-volt lighting electrical power system in certain models of the BAe 125 Series. This directive was introduced to mitigate risks associated with electrical faults that could lead to safety hazards, such as the incident where a short circuit caused smoke in the flightdeck due to inadequate protection of the 6V output from the lighting transformer. The policy objective is to enhance the safety of the aircraft by ensuring that the specified modifications are implemented to safeguard against electrical failures. The directive applies to all series 600A, 600B, 700A, and 700B aircraft that have not yet incorporated Modification 253544A&B. Compliance with this directive is mandatory, with a specified deadline of 31 January 1995, as outlined by the Civil Aviation Safety Authority.
Scope and Application
The Civil Aviation Regulations 1998, specifically Part 39 - 105, pertains to the airworthiness directives issued by the Civil Aviation Safety Authority (CASA) and applies to all aircraft owners and operators of British Aerospace BAe 125 Series Aeroplanes, including series 600A, 600B, 700A, and 700B, unless they have already incorporated Modification 253544A&B. The directive mandates the incorporation of Modification No 253544A&B to address an electrical safety issue where a short circuit in the flightdeck's six volt lighting system could potentially lead to smoke on the flightdeck. This requirement stems from a classified mandatory service bulletin issued by the UK Civil Aviation Authority (CAA), reflecting the importance of the modification. Compliance with this directive is imperative, with the installation of the necessary circuit breakers mandated prior to 31 January 1995 to ensure the safety of all relevant aircraft within the Australian jurisdiction.
Key Provisions
The Civil Aviation Regulations 1998, specifically in Part 39-105, mandates Airworthiness Directives (AD) for certain aircraft to ensure safety. One such AD, AD/HS 125/142, pertains to the British Aerospace BAe 125 Series aeroplanes, focusing on the flightdeck six volt lighting electrical power system (Section 5/94). This AD applies to all series 600A, 600B, 700A, and 700B aircraft that have not yet incorporated Modification 253544A&B. The primary requirement of this AD is the incorporation of Modification No 253544A&B as per the Hawker Raytheon Corporate Jets Service Bulletin (Modification) SB.24-310-3544A&B dated 14 February 1994. This modification is classified as mandatory by the UK Civil Aviation Authority (CAA).
This legislative provision imposes several obligations on the aircraft operators and maintenance entities. They must ensure that the specified aircraft models comply with the AD by installing the required modifications. The modification involves installing two circuit breakers to protect the 6V lighting circuits, a measure necessitated by an incident where a wire short-circuited, leading to smoke in the flightdeck. Compliance with this directive is mandatory and must be achieved before 31 January 1995. Failure to comply with this AD can have significant safety implications, as the 6V lighting system is a critical component in the flightdeck environment.
The Civil Aviation Regulations 1998 outline severe consequences for non-compliance with ADs. The enforcement of these regulations is overseen by the Civil Aviation Safety Authority (CASA), which can impose penalties and sanctions for breaches. While the specific penalties for non-compliance with AD/HS 125/142 are not detailed in the provided text, general penalties for violations of the Civil Aviation Regulations can include fines and potential grounding of non-compliant aircraft. In severe cases, non-compliance could lead to criminal charges, particularly if it results in safety incidents or endangers flight operations. Thus, adherence to the AD is not only a regulatory requirement but also a critical safety measure to protect aircrew and passengers.