AD/PC-12/4 - Propeller De-Icing Controller

Overview

The Civil Aviation Regulations 1998 (CAR 1998) introduced a comprehensive regulatory framework to ensure the safety of civil aviation in Australia. The legislation, enacted by the Australian Parliament, aims to provide a unified set of rules and standards governing all aspects of civil aviation, including airworthiness, licensing, and operations. The Civil Aviation Safety Authority (CASA), established under these regulations, is tasked with implementing and enforcing the standards set forth to ensure public safety and maintain the integrity of the aviation system. This particular legislative instrument, AD/PC-12/4, addresses a specific safety concern related to the Pilatus PC-12 Series Aeroplanes, targeting the potential for Electromagnetic Interference (EMI) induced failures in the Propeller De-icing Controller (PDIC). The policy objective is to mitigate this risk by requiring inspections and necessary modifications to the PDIC to prevent incorrect operations and nuisance fault warnings, thereby enhancing flight safety and reliability.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, which includes Airworthiness Directives for aircraft such as the Pilatus PC-12 series aeroplanes, applies to aircraft within the Commonwealth of Australia. This particular directive, AD/PC-12/4, pertains to Pilatus PC-12 aeroplanes with serial numbers ranging from 101 to 153 inclusive, provided they are equipped with a specific Propeller De-Icing Controller (PDIC) part number 968.29.13.223 (BFG 4E3163-1). The directive mandates that these aeroplanes undergo an inspection to determine the modification status of the PDIC and, if required, replace the PDIC according to the guidelines set out in Pilatus Aircraft Ltd Service Bulletin 30-002 dated 16 September 1996. Compliance with this directive must be achieved either concurrently with the implementation of Pilatus Aircraft Ltd Service Bulletin 30-001 dated 20 December 1995 or before 31 January 1997, whichever is later. The directive was made effective on 7 November 1996 following a potential issue identified by the Swiss Federal Office for Civil Aviation regarding electromagnetic interference that could result in the incorrect operation of the PDIC or nuisance fault warnings.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, includes a directive concerning the Pilatus PC-12 Series Aeroplanes. This directive, AD/PC-12/4, pertains to the Propeller De-Icing Controller (PDIC) and applies to PC-12 aeroplanes with serial numbers ranging from 101 to 153 inclusive, which are equipped with a particular PDIC part number (section 12/96). The primary requirement of this directive is to inspect the PDIC to ascertain its modification status and, if needed, replace the PDIC in line with the instructions detailed in Pilatus Aircraft Ltd Service Bulletin (SB) 30-002 dated 16 September 1996. The directive mandates that the inspection and necessary modifications to the PDIC must be carried out either concurrently with the incorporation of Pilatus Aircraft Ltd SB 30-001 dated 20 December 1995 or before 31 January 1997, whichever is later (section Compliance). This ensures that the aeroplanes are compliant with the safety standards set forth by the Swiss Federal Office for Civil Aviation (FOCA), which identified a potential for Electromagnetic Interference (EMI) induced failure of the PDIC. Such a failure, if unaddressed, could result in incorrect PDIC operation and/or nuisance fault warnings. This directive took effect on 7 November 1996, as stated in the background information. Operators of the specified Pilatus PC-12 aeroplanes must adhere to this directive to ensure the airworthiness of their aircraft. This includes conducting the required inspections and making the necessary modifications to the PDIC to mitigate the risk of EMI-induced failures. Failure to comply with this directive could result in significant safety risks, including potential operational disruptions and the possibility of the aircraft being grounded until the required modifications are completed. In the event of non-compliance, the directive does not explicitly state specific penalties or consequences. However, under the broader framework of the Civil Aviation Regulations 1998, failure to adhere to airworthiness directives can lead to enforcement actions by the Civil Aviation Safety Authority (CASA). These actions can include fines, operational restrictions, or other regulatory measures to ensure compliance. The exact penalties for non-compliance would depend on the specific circumstances and the discretion of CASA.