COMMONWEALTH OF AUSTRALIA (Civil Aviation Safety Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
AIRWORTHINESS DIRECTIVE
On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/BAe 146/111 and issues the following AD under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.
British Aerospace BAe 146 Series Aeroplanes
AD/BAe 146/111
Amdt 1
APU - Insulation Blankets & Exhaust Drain Blank
13/2004
Applicability: BAe 146 Series and AVRO 146-RJ Series aeroplanes with Sundstrand APU installed (Modification HCM30373A) or Sundstrand APU installed with optional duct (Modification HCM30373A and HCM36166C).
Requirement: Install modification HCM36244A in accordance with BAe Systems (Operations) Ltd Service Bulletin 49-072-36244A dated 11 October 2004.
Note: UK CAA AD G-2004-0007 (EASA Ref No. 2004-2324) refers.
Compliance: No later than 8 July 2005.
This Amendment becomes effective on 23 December 2004.
Background: APU exhaust duct skin temperatures within the ECS bay have been found to be higher than the certificated maximum. The ECS bay is not a designated fire zone hence there is no fire detection or suppression system and ventilation airflow around the APU exhaust is low. As fuel and hydraulic pipe work pass through the ECS bay a risk of flammable fluid ignition exists if leaking fluid contacts the APU exhaust duct skin.
This Directive originally required the embodiment of Mod HCM36240A insulation blankets. That modification has been found to be ineffective. This amendment requires the removal of that modification if fitted and the embodiment of Mod HCM36244A.
The original issue of this Directive became effective on 8 July 2004.
James Coyne
Delegate of the Civil Aviation Safety Authority 8 November 2004
The above AD is notified in the Commonwealth of Australia Gazette on 1 December 2004.
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Overview
The Civil Aviation Safety Regulations 1998, administered by the Civil Aviation Safety Authority (CASA), were enacted to ensure the safety of civil aviation in Australia. This legislative instrument aims to address the problem of unsafe conditions in aircraft operations by issuing airworthiness directives. The specific amendment, F2006B03464, addresses an issue identified with British Aerospace BAe 146 Series aeroplanes, specifically those equipped with a Sundstrand Auxiliary Power Unit (APU). The problem identified was that the exhaust duct skin temperatures within the Environmental Control System (ECS) bay were higher than the certificated maximum, which posed a risk of flammable fluid ignition if leaking fluid contacted the APU exhaust duct skin. The policy objective is to mandate corrective actions that ensure compliance with safety standards and mitigate identified risks.
Scope and Application
The Civil Aviation Safety Regulations 1998, specifically Airworthiness Directive AD/BAe 146/111 Amendment 1, applies to BAe 146 Series and AVRO 146-RJ Series aeroplanes equipped with a Sundstrand Auxiliary Power Unit (APU) installed with modification HCM30373A, or those with an optional duct installed with modifications HCM30373A and HCM36166C. The regulation mandates that the modification HCM36244A be installed in accordance with BAe Systems (Operations) Ltd Service Bulletin 49-072-36244A dated 11 October 2004, with compliance required no later than 8 July 2005. This directive addresses safety concerns related to high exhaust duct skin temperatures, which pose a risk of igniting flammable fluids in the absence of a fire detection or suppression system. The amendment becomes effective on 23 December 2004 and was published in the Commonwealth of Australia Gazette on 1 December 2004.
Key Provisions
This legislative instrument primarily focuses on the Civil Aviation Safety Regulations 1998, particularly Part 39 - 105, which includes Airworthiness Directives (ADs) issued by the Civil Aviation Safety Authority (CASA). Section 39.1(1) of the Civil Aviation Safety Regulations 1998 allows CASA to issue ADs, which are mandatory safety measures for specific aircraft to address safety concerns. In this particular case, AD/BAe 146/111 Amdt 1, issued on 8 November 2004 and effective from 13 December 2004, concerns the British Aerospace BAe 146 Series aeroplanes with a Sundstrand Auxiliary Power Unit (APU). The directive requires the installation of modification HCM36244A to address previously identified safety issues with the APU exhaust duct insulation blankets.
The AD imposes specific obligations on the operators of the BAe 146 Series and AVRO 146-RJ Series aeroplanes equipped with a Sundstrand APU. These obligations include the installation of the required modification, HCM36244A, in accordance with BAe Systems (Operations) Ltd Service Bulletin 49-072-36244A dated 11 October 2004. The directive mandates that this modification be completed no later than 8 July 2005, ensuring that the specified safety improvements are implemented within the stipulated timeframe. The directive also references a related UK Civil Aviation Authority AD, providing additional context and validation of the required actions.
Failure to comply with the AD can result in serious consequences, including potential safety risks and regulatory penalties. Under the Civil Aviation Safety Regulations 1998, non-compliance with an AD can lead to enforcement actions by CASA. The potential penalties for not adhering to the requirements of this AD may include fines and other regulatory measures, which could impact the operator's ability to continue operating the affected aircraft. The severity of these penalties underscores the importance of timely and accurate compliance with the AD to maintain the safety standards required by Australian aviation regulations.