COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Piper PA-42 (Cheyenne III) 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/PA-42/25 Airframe Pneumatic De-icing Boots 11/2000 DM
Applicability: All Model PA-42, PA-42-720, PA-42-720R, and PA-42-1000 aircraft; equipped with pneumatic de-icing boots.
Requirement: Revise the Limitations Section of the Aircraft Flight Manual (AFM) to include the following requirements for activation of the ice protection systems. Accomplish this action by inserting a copy of this Directive in the AFM.
“ Except for certain phases of flight where the AFM specifies that de-icing boots should not be used (eg., take-off, final approach, and landing), compliance with the following is required.
- Wing and Tail Leading Edge Pneumatic De-icing 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 minimise the ice accretions on the airframe.
- The wing and tail leading edge pneumatic de-icing boot system may be deactivated only after:
Leaving known or observed/detected icing that the flight crew has visually observed on the aircraft or was identified by the on-board sensors; and
After the aircraft is determined to be clear of ice.”
Note: FAA AD 2000-14-08 Amdt 39-11817 refers.
Compliance: Within 10 days after 13 September 2000.
This Airworthiness Directive becomes effective on 13 September 2000.
COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Background: The FAA received reports of in-flight incidents and an accident (on aircraft other than the affected Piper aircraft) that occurred in icing conditions where the airframe pneumatic boots were not activated. The actions specified by this Directive are intended to assure that flight crews activate the pneumatic wing and tail de-icing boots at the first signs of ice accumulation.
David Alan Villiers
Delegate of the Civil Aviation Safety Authority 6 September 2000
The above AD is notified in the Commonwealth of Australia Gazette on 13 September 2000.
Overview
The Civil Aviation Regulations 1998, under the jurisdiction of the Civil Aviation Safety Authority (CASA), were enacted to ensure the safe operation of civil aircraft in Australia. Among the various amendments, Part 39 - 105 Civil Aviation Safety Authority Schedule of Airworthiness Directives, introduced a specific directive for Piper PA-42 (Cheyenne III) Series aeroplanes. This directive, AD/PA-42/25, was established in response to reports of in-flight incidents and accidents linked to icing conditions where airframe pneumatic de-icing boots were not activated. The policy objective of this directive was to ensure that flight crews activate the pneumatic wing and tail de-icing boots at the first signs of ice accumulation, thereby enhancing the safety of the aircraft in adverse weather conditions. The directive mandates the revision of the Aircraft Flight Manual to include specific requirements for the activation and deactivation of the ice protection systems, with compliance required within ten days of the directive’s issuance.
Scope and Application
The Civil Aviation Regulations 1998, specifically PART 39 - 105, establish the Civil Aviation Safety Authority’s (CASA) authority to issue Airworthiness Directives (ADs) for maintaining the airworthiness of aircraft. AD/PA-42/25 pertains to all Model PA-42, PA-42-720, PA-42-720R, and PA-42-1000 aircraft equipped with pneumatic de-icing boots. This directive mandates that the Aircraft Flight Manual (AFM) be revised to include specific requirements for activating the ice protection systems, which must be completed within ten days of the directive's issuance date, 13 September 2000. The directive ensures that the pneumatic wing and tail leading edge de-icing boot systems are activated at the first sign of ice formation, except during certain phases of flight specified in the AFM, and that they remain operational until the aircraft is clear of ice. The directive applies nationwide and extends to any aircraft within the specified models and equipment configurations, with no stated exclusions or exemptions.
Key Provisions
The Airworthiness Directive (AD) AD/PA-42/25, issued under section 39.1(1) of the Civil Aviation Regulations 1998, applies to all Model PA-42, PA-42-720, PA-42-720R, and PA-42-1000 aircraft equipped with pneumatic de-icing boots. The AD requires that the Limitations Section of the Aircraft Flight Manual (AFM) be revised to include specific requirements for the activation and deactivation of the ice protection systems. Specifically, the wing and tail leading edge pneumatic de-icing boot system must be activated at the first sign of ice formation or upon an ice detector annunciation, and it must either be operated in the automatic cycling mode or manually cycled as needed to minimise ice accretion. The system may only be deactivated after leaving known or observed icing conditions and ensuring the aircraft is clear of ice. This requirement must be accomplished by inserting a copy of the AD into the AFM.
The obligations imposed by this AD are centred around the modification of the AFM to incorporate the new requirements for the activation and deactivation of the de-icing boots. This action must be completed within 10 days from 13 September 2000, the date the AD becomes effective. The AD mandates that the specified changes be made to ensure that flight crews adhere to the new operational protocols for ice protection systems, thus enhancing flight safety in icing conditions.
Failure to comply with the AD AD/PA-42/25 may result in serious consequences. While the Civil Aviation Regulations 1998 do not explicitly state the penalties for non-compliance with this particular AD, general provisions within the regulations could impose civil or criminal penalties. Non-compliance with ADs can lead to enforcement actions, including fines and potential grounding of the aircraft until the required modifications are made. The seriousness of the potential consequences underscores the importance of adhering to the AD’s stipulations to ensure the safety and airworthiness of the aircraft.