COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Israel Aircraft Industries 1125 (Astra) Series Aeroplanes
AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 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.
AD/IAI-A/3 Airframe De-Ice Boots - Pressure Indication Switches
7/2000
Applicability: Model 1125 and Astra SPX aeroplanes with Serial Numbers 004 through 115 inclusive.
Requirement: If not previously accomplished, replace all the inflation pressure indication switches of the airframe de-ice boots system with switches Part Number V25W787003-005 in accordance with Astra Alert Service Bulletin 1125-30A-199 dated 17 April 2000.
Note: Israel CAA AD 30-00-02-05 refers.
Compliance: Before 7 March 2001.
This Airworthiness Directive becomes effective on 13 July 2000.
Background: Existing indication on the switches of the de-icing boots system operate at 13±1 PSIG whereas, according to the de-icing boot’s manufacturer, 15 PSIG is the required pressure for effective de-icing. Therefore, indication of normal system operation may be misleading when the system is operating at reduced pressure and ice removal capability may be insufficient throughout the aeroplanes certified envelope of ice conditions.
This Directive requires the replacement of the existing switches with switches that operate at a higher pressure.
Eugene Paul Holzapfel
Delegate of the Civil Aviation Safety Authority 23 May 2000
The above AD is notified in the Commonwealth of Australia Gazette on 14 June 2000.
Overview
The Civil Aviation Regulations 1998, enacted by the Parliament of Australia, establish a comprehensive framework for ensuring the safety of civil aviation. One specific legislative instrument under this Act, identified as F2006B10778, was introduced to address the problem of misleading pressure indication in the de-icing boots system of certain aircraft models. This Airworthiness Directive was issued by the Civil Aviation Safety Authority (CASA) to rectify a condition where the indication of normal system operation could be misleading due to the system operating at a lower pressure than required for effective de-icing. The policy objective of this directive is to ensure that the de-icing system operates within the correct pressure parameters, thereby enhancing safety during ice conditions. The directive mandates the replacement of existing pressure indication switches with those operating at the required higher pressure, ensuring accurate system monitoring and effective ice removal.
Scope and Application
The Airworthiness Directive (AD) issued under the Civil Aviation Regulations 1998 specifically applies to Model 1125 and Astra SPX aeroplanes produced by Israel Aircraft Industries with Serial Numbers 004 through 115 inclusive. The directive pertains to the replacement of inflation pressure indication switches within the airframe de-ice boots system to ensure the system operates at the required pressure of 15 PSIG for effective de-icing. This action is deemed necessary to correct a condition where the existing switches operate at 13±1 PSIG, potentially leading to misleading indications of system operation and insufficient ice removal capability. The directive mandates compliance by replacing the switches with those specified as Part Number V25W787003-005 in accordance with instructions provided in Astra Alert Service Bulletin 1125-30A-199 dated 17 April 2000. The AD was made effective on 13 July 2000, with a compliance deadline set before 7 March 2001. The directive was issued by the Civil Aviation Safety Authority (CASA) and was published in the Commonwealth of Australia Gazette on 14 June 2000.
Key Provisions
The Civil Aviation Regulations 1998, specifically under PART 39 - 105, issue an Airworthiness Directive (AD) concerning the Israel Aircraft Industries 1125 (Astra) Series Aeroplanes (section 1). The AD, labelled AD/IAI-A/3, focuses on the replacement of inflation pressure indication switches in the airframe de-ice boots system (section 1). This AD applies to Model 1125 and Astra SPX aeroplanes with Serial Numbers 004 through 115 inclusive (section 2). The requirement is that if not already done, all inflation pressure indication switches of the airframe de-ice boots system must be replaced with switches Part Number V25W787003-005, in accordance with Astra Alert Service Bulletin 1125-30A-199 dated 17 April 2000 (section 3). This action must be completed before 7 March 2001 (section 4).
The AD imposes a clear requirement on aircraft operators and relevant maintenance personnel to replace the existing switches with the specified new ones to ensure the de-icing boots system operates effectively at the required pressure of 15 PSIG (section 3). This ensures that the indication of normal system operation is not misleading and that ice removal capability remains sufficient throughout the aeroplanes' certified ice conditions (section 1). The directive references Israel CAA AD 30-00-02-05, indicating that this action is in line with international safety standards (section 3).
Failure to comply with the AD's requirements may result in non-compliance with safety regulations, potentially leading to unsafe operational conditions. The AD does not explicitly state specific penalties for non-compliance; however, under general aviation safety laws, non-compliance with ADs can lead to significant civil or criminal consequences, including fines and imprisonment. The Civil Aviation Safety Authority (CASA) has the authority to enforce compliance and may take action against non-compliant aircraft operators or maintenance providers (section 4).
This AD becomes effective on 13 July 2000, and its notification in the Commonwealth of Australia Gazette on 14 June 2000 ensures that all relevant parties are informed of the directive and its requirements. The background section explains that existing switches operate at 13±1 PSIG, whereas the manufacturer specifies that 15 PSIG is necessary for effective de-icing, highlighting the importance of this directive for safety and operational integrity (section 1).
In summary, the AD requires specific action to be taken on certain Israel Aircraft Industries 1125 (Astra) Series Aeroplanes to ensure their de-icing systems operate correctly. The directive imposes a clear obligation on affected aircraft operators to replace the pressure indication switches by a specified date to prevent unsafe conditions. Non-compliance could result in significant penalties under aviation safety laws.