COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Frakes (Grumman) G73 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/G73/23 Operation of Deicing Boots 7/2000
Applicability: Model G-73 and G-73T series aircraft fitted with pneumatic deicing boots.
Requirement: Revise the Limitations Section of the Aircraft Flight Manual (AFM) by incorporating the following:
" Except if the AFM otherwise specifies that deicing boots should not be used for certain phases of flight (e.g., take-off, final approach, and landing), compliance with the following is required.
- Wing and Tail Leading Edge Pneumatic Deicing Boot System, if installed, must be activated:
- At the first sign of ice formation anywhere on the aircraft, or upon annunciation from an ice detector system, whichever occurs first; and
- The system must either be continued to be operated in the automatic cycling mode, if available; or the system must be manually cycled as needed to minimize the ice accretions on the airframe.
- "The wing and tail leading edge pneumatic deicing boot system may be deactivated only after completion of an entire deicing cycle after leaving icing conditions."
Alternatively, a copy of this Directive may be inserted in the Limitations Section of the Aircraft Flight Manual preceding the paragraph covering Operation in Icing Conditions.
This AFM amendment may be accomplished by the aircraft CoR holder, who can sign the aircraft logbook for completion of this Directive.
Note 1: Ice adhesion can be reduced by periodic treatment of deicing boots with a deicing compound such as “ICEX”, an ice-phobic chemical spray.
Note 2: FAA AD 99-19-07 Amendment 39-11296 refers.
COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Compliance: Within 10 calendar days time in service from the effective date of this Directive.
This Airworthiness Directive becomes effective on 13 July 2000.
Background: This Directive is issued to ensure deicing boots are activated as soon as ice build up is detected. If this action is not taken flight crews may experience reduced controllability of the aircraft due to the aerodynamic effects of ice adhering to the aircraft prior to the first deicing cycle.
Eugene Paul Holzapfel
Delegate of the Civil Aviation Safety Authority 2 June 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, provide a comprehensive regulatory framework for civil aviation in Australia, including safety standards and operational requirements. One of the key mechanisms within these regulations is the issuance of Airworthiness Directives (ADs) by the Civil Aviation Safety Authority (CASA). These directives address specific safety concerns and mandate corrective actions to ensure the continued airworthiness of aircraft. The AD in question, AD/G73/23 issued on 7 July 2000, pertains specifically to the Frakes (Grumman) G73 Series Aeroplanes. The directive was introduced to address the problem of ice formation on aircraft surfaces, which can adversely affect flight control and safety. By mandating that deicing boots be activated at the first sign of ice formation, the AD aims to mitigate the risks associated with ice accumulation, thereby enhancing the overall safety of aircraft operations in icing conditions.
Scope and Application
The Civil Aviation Safety Authority (CASA) has issued an Airworthiness Directive (AD) under the Civil Aviation Regulations 1998, specifically targeting the operation of deicing boots for Frakes (Grumman) G73 series aeroplanes. This AD applies to all G-73 and G-73T series aircraft that are equipped with pneumatic deicing boots, irrespective of their location within the Commonwealth of Australia. The directive mandates that the Limitations Section of the Aircraft Flight Manual (AFM) be revised to include specific instructions regarding the activation and deactivation of the wing and tail leading edge pneumatic deicing boot system. The requirement stipulates that these systems must be activated at the first sign of ice formation or upon an ice detector system's annunciation, and must either operate in automatic cycling mode or be manually cycled to manage ice accretions. Deactivation of these systems is permitted only after a complete deicing cycle has been executed post-icing conditions. This amendment must be completed within ten calendar days from the effective date of the AD, which is 13 July 2000. Notably, the AD can be incorporated into the AFM either by amending the existing Limitations Section or by inserting a copy of the directive itself. This AD extends its application through subordinate instruments as necessary to ensure compliance and safety within the specified timeframe.
Key Provisions
The Airworthiness Directive (AD) under section 39.1(1) of the Civil Aviation Regulations 1998, specifically AD/G73/23, pertains to the Frakes (Grumman) G73 series aeroplanes. This directive applies to model G-73 and G-73T aircraft equipped with pneumatic deicing boots (section 39.1(1)). The requirement is to revise the Aircraft Flight Manual (AFM) by incorporating specific instructions regarding the operation of the wing and tail leading edge pneumatic deicing boot system. The revised AFM must state that the deicing boots must be activated at the first sign of ice formation or upon annunciation from an ice detector system, whichever occurs first. The system must then be either maintained in automatic cycling mode, if available, or manually cycled to minimise ice accretions on the airframe (section 39.1(1)). The deicing boots may only be deactivated after an entire deicing cycle has been completed following exposure to icing conditions (section 39.1(1)). Compliance with this directive must occur within 10 calendar days from the effective date, which is 13 July 2000.
The AD imposes obligations on the parties and entities it governs, primarily those who operate the Frakes (Grumman) G73 series aircraft. These entities must ensure that the AFM is revised to include the specified deicing boot operation instructions. This includes the activation of the deicing boots at the first indication of ice formation and the continuation of cycling until an entire deicing cycle is completed. Additionally, the aircraft's Certificate of Registration (CoR) holder is responsible for signing the aircraft logbook to confirm the completion of this directive. The directive also notes that ice adhesion can be reduced by periodically treating the deicing boots with a deicing compound such as "ICEX", an ice-phobic chemical spray.
Failure to comply with the AD could result in significant safety risks, as the directive is issued to prevent reduced controllability of the aircraft due to ice build-up. While the AD does not explicitly state penalties for non-compliance, the overarching Civil Aviation Regulations 1998 may impose penalties for breaches. Such penalties could include fines or other civil or criminal consequences as stipulated under the regulations. The exact penalties would depend on the specific regulations under which the breach is prosecuted.