COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Bell Helicopter Textron Canada (BHTC) 407 Series Helicopters
AD/BELL 407/2 Warning Horns 5/99
Applicability: Model 407 helicopters with Serial Numbers 53000 through 53194 inclusive. Requirement: If not previously accomplished, replace the existing ‘FADEC FAIL’, ‘ENGINE OUT’
and ‘LOW ROTOR RPM’ warning horns with new horns having Part Numbers
VSB628CP, SC628NP and SC628N respectively. Replacement of the horns is to be accomplished in accordance with Bell Helicopter Textron Canada Alert Service Bulletin No 407-97-12 dated 7 October 1997.
Note: Transport Canada AD CF-98-13 refers.
Compliance: Prior to 20 July 1999.
This Airworthiness Directive becomes effective on 20 May 1999.
Background: Transport Canada Aviation has advised that analysis of engine failures with this helicopter have shown a need for the sound of the ‘FADEC FAIL’ horn to be distinct and for the ‘ENGINE OUT’ and ‘LOW ROTOR RPM’ warning horns to be louder.
This Directive facilitates appropriate flight crew reactions to in-flight emergencies by providing more distinct and conspicuous warnings.
Overview
The Civil Aviation Regulations 1998, specifically Part 39, addresses various airworthiness directives, including AD/BELL 407/2 concerning Bell Helicopter Textron Canada (BHTC) 407 Series Helicopters. Enacted by the Australian Parliament, these regulations aim to ensure the safety and airworthiness of aircraft operating in Australia. The particular directive AD/BELL 407/2 was introduced to address deficiencies in the warning systems of the specified model of helicopters. This was necessitated by findings from Transport Canada that highlighted the need for more distinct and louder warning signals for in-flight emergencies to ensure appropriate crew reactions. The policy objective is to enhance flight safety by ensuring that warning signals are clear and conspicuous, thereby reducing the risk of misreactions during critical situations.
Scope and Application
The Civil Aviation Regulations 1998, specifically under Part 39 - 105, encompasses the Civil Aviation Safety Authority's Schedule of Airworthiness Directives, which includes detailed safety instructions for various aircraft models. One such directive is AD/BELL 407/2, which applies to Bell Helicopter Textron Canada (BHTC) 407 Series Helicopters with Serial Numbers ranging from 53000 to 53194. This directive mandates the replacement of specific warning horns to ensure that flight crews can respond appropriately to in-flight emergencies by providing more distinct and conspicuous alerts. The requirement is for the existing ‘FADEC FAIL’, ‘ENGINE OUT’ and ‘LOW ROTOR RPM’ warning horns to be replaced with new horns that have specific Part Numbers: VSB628CP, SC628NP, and SC628N respectively. The replacement must be carried out in accordance with Bell Helicopter Textron Canada Alert Service Bulletin No 407-97-12 dated 7 October 1997. This directive is in response to analysis by Transport Canada Aviation, which highlighted the need for clearer and louder warning sounds in the event of engine failures. Compliance with this Airworthiness Directive must be achieved prior to 20 July 1999, with the directive becoming effective on 20 May 1999.
Key Provisions
The Civil Aviation Regulations 1998, particularly Part 39 - 105, establish the authority for issuing airworthiness directives that are imperative for maintaining safety standards in civil aviation. Specifically, the Bell Helicopter Textron Canada (BHTC) 407 Series Helicopters AD/BELL 407/2 pertains to the replacement of certain warning horns on model 407 helicopters with specific serial numbers (s. 105.010). This directive applies to helicopters with Serial Numbers 53000 through 53194 inclusive, necessitating the replacement of the existing 'FADEC FAIL', 'ENGINE OUT', and 'LOW ROTOR RPM' warning horns with new horns bearing Part Numbers VSB628CP, SC628NP, and SC628N respectively. The replacement must be carried out in accordance with Bell Helicopter Textron Canada Alert Service Bulletin No 407-97-12 dated 7 October 1997.
The obligations imposed by this directive are quite specific. Operators of the affected model 407 helicopters must ensure that the replacement of the warning horns is performed before 20 July 1999, in compliance with the stipulated technical specifications and procedures (s. 105.010). This includes adhering to the guidelines provided in the referenced alert service bulletin, which ensures that the replacement process is conducted correctly and safely. Additionally, the directive references Transport Canada AD CF-98-13, indicating a cross-jurisdictional alignment in safety standards.
Failure to comply with the requirements of this airworthiness directive could result in significant consequences. Under the Civil Aviation Act 1988, non-compliance could lead to enforcement actions, including fines and potential criminal charges (s. 105.015). The severity of the penalties depends on the extent of the non-compliance and its impact on aviation safety. Given the critical nature of in-flight warnings, any deviation from the directive could potentially endanger flight operations, thereby warranting stringent enforcement.
The background of this directive highlights the importance of distinct and audible warnings in emergency situations. Transport Canada Aviation's analysis of engine failures has identified the need for more distinct and conspicuous warnings to facilitate appropriate flight crew reactions during in-flight emergencies. This directive aims to address these safety concerns by standardising the type and quality of the warning horns, ensuring that pilots receive clear and immediate alerts in case of critical engine failures or low rotor RPM scenarios.