COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) 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/AC/98 Operation of Deicing Boots 7/2000
Applicability: All models 680, 680E, 680F, 680FL, 680FL(P), 680T, 680V, 680W, 681, 685, 690,
690A, 690B, 690C, 690D, 695, 695A and 695B aircraft fitted with pneumatic deicing boots.
Requirement: Revise the Limitations Section of the aircraft's Aircraft Flight Manual (AFM) by incorporating the following:
" Except for certain phases of flight where the AFM specifies that deicing boots should not be used (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 leaving icing conditions and after the airplane is determined to be clear of ice."
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 2000-02-30 Amendment 39-11548 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, which were enacted to regulate civil aviation safety and ensure the safe operation of aircraft, include specific airworthiness directives aimed at addressing safety concerns identified by the Civil Aviation Safety Authority (CASA). One such directive, issued in 2000, focuses on the operation of deicing boots on certain models of aircraft to prevent ice accumulation, which can adversely affect flight control. This Airworthiness Directive (AD) was issued to mandate the activation of pneumatic deicing boots at the first sign of ice formation to mitigate risks associated with ice adhesion on the aircraft's airframe. The AD requires amendments to the aircraft's flight manual to incorporate these operational requirements and mandates compliance within ten days of the directive's effective date.
Scope and Application
This Airworthiness Directive issued under the Civil Aviation Regulations 1998 applies to all models of aircraft listed in the applicability section that are fitted with pneumatic deicing boots. The directive mandates that the limitations section of the aircraft's Aircraft Flight Manual (AFM) be revised to include specific instructions regarding the operation of the deicing boots during icing conditions. The requirement stipulates that the boots must be activated at the first sign of ice formation or upon an ice detector system annunciation and should remain operational until the aircraft is clear of ice. The directive can be implemented by the aircraft's Certificate of Registration holder, who can also sign the aircraft logbook to confirm completion. This Airworthiness Directive is effective within 10 calendar days of its publication and aims to mitigate risks associated with ice build-up, ensuring the continued safety of aircraft operations in icing conditions.
Key Provisions
The Civil Aviation Regulations 1998 (CAR 1998) in Part 39, specifically section 39.1 (1), empower the Civil Aviation Safety Authority (CASA) to issue Airworthiness Directives (AD) to ensure the safety of aircraft operations. One such AD, issued under this authority, concerns the operation of deicing boots on certain models of Twin Commander aircraft (AD/AC/98 7/2000). This AD applies to all models 680, 680E, 680F, 680FL, 680FL(P), 680T, 680V, 680W, 681, 685, 690, 690A, 690B, 690C, 690D, 695, 695A, and 695B fitted with pneumatic deicing boots. The requirement of this AD is to revise the aircraft's Aircraft Flight Manual (AFM) to ensure that the wing and tail leading edge pneumatic deicing boot system is activated at the first sign of ice formation or upon an ice detector system annunciation, whichever occurs first. This system must either be kept in automatic cycling mode or manually cycled as necessary to minimise ice accretion on the airframe. The system may only be deactivated once the aircraft is out of icing conditions and confirmed to be clear of ice. The directive may also be inserted directly into the AFM’s Limitations Section, with the aircraft's Certificate of Registration (CoR) holder signing the aircraft logbook to confirm compliance.
The obligations under this AD for the relevant aircraft owners and operators include ensuring that the AFM is updated to incorporate the specified deicing boot operation requirements. This necessitates a review of the AFM to ensure compliance with the AD's instructions, which may involve coordination with the aircraft's manufacturer or an authorised representative. The updated AFM must reflect the revised operational procedures for the deicing boots, ensuring that flight crews are adequately informed of the new requirements. Additionally, operators must ensure that the deicing boots are activated and operated as specified, with appropriate manual intervention as needed. Periodic treatment of deicing boots with a deicing compound, such as "ICEX", can be employed to reduce ice adhesion.
Failure to comply with this Airworthiness Directive may result in serious safety risks, as the presence of ice on the aircraft can significantly affect its aerodynamics and controllability. The Civil Aviation Safety Authority (CASA) mandates that compliance with the AD must be achieved within 10 calendar days of its effective date, which is 13 July 2000. While the specific penalties for non-compliance are not detailed in the directive, general provisions within CAR 1998 provide for enforcement actions that may include fines, suspension or revocation of the aircraft's Certificate of Airworthiness, and potential criminal charges in cases of serious non-compliance. These consequences underscore the importance of adhering to the AD to maintain the highest safety standards in aviation operations.