AD/IAI-W/24 - Engine Inlet Cowl and Aft Nacelle Attachment Bolts

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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

 


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.

 

Israel Aircraft Industries 1123 & 1124 (Westwind) Series Aeroplanes

 

AD/IAI-W/24 Engine Inlet Cowl and Aft Nacelle Attachment

Bolts


8/2001

DM

 

 

Applicability: All Model 1124/1124A Westwind aircraft.

 

Requirement: Action in accordance with Israel Aircraft Industries Alert Service Bulletin 1124-54A- 138.

 

Note: Israel CAA AD 54-01-05-02 refers.

 

Compliance: Within 50 hours time in service after 4 July 2001.

 

This Airworthiness Directive becomes effective on 4 July 2001.

 

Background:  On some aircraft, AN3 part number bolts have been found installed on engine case flanges. These bolts are not approved and are considered as fatigue critical for this application. This Directive requires verification of approved bolts.


 

David Alan Villiers

Delegate of the Civil Aviation Safety Authority 27 June 2001

 

 

The above AD is notified in the Commonwealth of Australia Gazette on 4 July 2001.

 

 


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Overview

The Civil Aviation Regulations 1998 (CAR 1998) represent a comprehensive legislative framework governing civil aviation safety within Australia. Enacted by the Commonwealth of Australia, these regulations were designed to address the need for a unified and robust safety standard across the aviation industry, aiming to ensure the safety of aircraft and personnel in the air, on the ground, and in the broader aviation environment. The CAR 1998 provides the Civil Aviation Safety Authority (CASA) with the regulatory authority to issue Airworthiness Directives, such as AD/IAI-W/24, which mandate specific actions to rectify unsafe conditions identified in certain aircraft models, ensuring compliance with safety standards. This particular directive concerning Israel Aircraft Industries 1123 & 1124 (Westwind) Series Aeroplanes exemplifies how the CAR 1998 and its subsequent directives work to maintain and enhance aviation safety by addressing identified issues promptly and effectively.

Scope and Application

The Airworthiness Directive (AD) issued under Part 39 of the Civil Aviation Regulations 1998 by the Civil Aviation Safety Authority (CASA) applies specifically to all Model 1124/1124A Westwind aircraft. This legislation mandates corrective actions concerning the engine inlet cowl and aft nacelle attachment bolts, necessitating adherence to the procedures outlined in Israel Aircraft Industries Alert Service Bulletin 1124-54A-138. The directive becomes effective from 4 July 2001, with a compliance requirement of addressing the issue within 50 hours of the aircraft being in service after this date. This AD was issued to rectify an unsafe condition identified with non-approved bolts installed on engine case flanges, which are considered fatigue critical. The directive is issued by a CASA delegate and published in the Commonwealth of Australia Gazette, ensuring that it is binding and enforceable within the national jurisdiction. The AD does not explicitly mention any exclusions or exemptions, suggesting that all applicable aircraft must comply unless otherwise specified in subordinate regulations.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39, Section 105, detail the requirements and procedures for Airworthiness Directives (ADs) as issued by the Civil Aviation Safety Authority (CASA). Under section 39.1 (1) of these regulations, a CASA delegate can issue an AD to address unsafe conditions identified in aircraft or aeronautical products. For example, AD/IAI-W/24 pertains to the Israel Aircraft Industries 1123 and 1124 (Westwind) Series Aeroplanes, focusing on the engine inlet cowl and aft nacelle attachment bolts. This directive applies to all Model 1124/1124A Westwind aircraft and mandates that corrective action be taken according to the instructions provided in Israel Aircraft Industries Alert Service Bulletin 1124-54A-138. The action required is to verify that approved bolts are correctly installed, as unapproved bolts have been identified as a safety risk. The obligations imposed by this AD are clear and precise. Aircraft operators must ensure that the specified corrective action, as outlined in the Alert Service Bulletin, is undertaken. This includes verifying the bolts' compliance with the approved specifications and ensuring that any necessary replacements or repairs are carried out. The AD specifies a compliance timeframe of 50 hours of time in service after the directive's effective date of 4 July 2001, providing a window for operators to address the issue without undue delay. Failure to comply with the requirements set out in the AD may result in severe consequences. Under the Civil Aviation Act 1988, non-compliance can lead to enforcement actions, including fines and potential criminal charges. The maximum penalties for such breaches can be significant, reflecting the seriousness of ensuring airworthiness and public safety. Specifically, the Act provides for fines of up to $126,000 for individuals and $630,000 for corporations, underscoring the importance of adhering to these directives to maintain the highest safety standards in aviation.

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Sourced from the Federal Register of Legislation at 26 August 2026. For the latest information on Australian Government law please go to https://www.legislation.gov.au.