COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Pilatus Britten-Norman BN-2 Series Aeroplanes
AD/BN-2/64
Amdt 1
Propeller Anti-Ice System 4/99 DM
Applicability: BN2T series Islander aeroplanes without modification NB-M-1662 incorporated.
Requirement: 1. Inspect the electrical cables, cable looms and other components of the propeller anti-ice system in accordance with Pilatus Britten-Norman Aircraft Manufacturers Service Bulletin (SB) BN2/SB.250 dated 6 July 1998.
2. If any of the cables or components are found to be unserviceable during the Requirement 1 inspection, either repair or replace the effected cables or components.
3. Modify the engine intake and propeller anti-ice electrical system in accordance with Britten-Norman SB BN2/SB.250 Issue 2 dated 1 December 1998.
Note: Both SBs have been classified as Mandatory by the CAA(UK) and CAA(UK) AD 005-07-98 also refers.
Compliance: 1. Remains unchanged as ‘Before further flight after 11 November 1998’.
2. Remains unchanged as ‘Before further flight’.
3. At the next 100 hour inspection after the effective date of this amendment or by 17 June 1999, which ever occurs first.
This Amendment becomes effective on 17 March 1999.
Background: Heat damage has been reported to the left propeller anti-ice electrical cables and cable loom attachments of a BN2T aeroplane. The damage was caused as a result of a electrical short circuit when insulation of one of the harness cables was worn by chafing in the spinner assembly. The applicable fuse did not function and the cables became too hot with the subsequent high current flow.
The original issue of the directive required inspection and, if necessary, repair of anti- ice electrical cables, looms and components. This amendment requires modification of the engine intake and propeller anti-ice electrical system to provide better circuit protection.
The original issue of this Airworthiness Directive became effective on 11 November 1998.
Overview
The Civil Aviation Regulations 1998, enacted by the Commonwealth of Australia, are a comprehensive set of rules designed to ensure the safety of civil aviation within Australia. One particular legislative instrument, F2006B04776, amends Part 39 - 105 concerning Airworthiness Directives for specific aircraft models. This amendment, issued on 4 March 1999, was introduced to address the problem of heat damage to the propeller anti-ice electrical cables and cable looms in Pilatus Britten-Norman BN-2 Series aeroplanes. The problem arose due to an electrical short circuit caused by worn insulation on the harness cables, leading to overheating and potential safety hazards. The amendment mandates the inspection, repair, or replacement of these components and requires modifications to the engine intake and propeller anti-ice electrical system to enhance circuit protection. Compliance with this directive is crucial to maintain airworthiness and ensure the safety of flights involving these aircraft.
Scope and Application
The Civil Aviation Regulations 1998, specifically Part 39 - 105, applies to the Pilatus Britten-Norman BN-2 Series Aeroplanes, more precisely to BN2T series Islander aeroplanes that have not incorporated the modification NB-M-1662. This legislation is mandated by the Civil Aviation Safety Authority (CASA) and pertains to the maintenance and safety standards of the propeller anti-ice system of these aircraft. The geographic reach of this Act is national, as it applies across Australia and is enforced by CASA, a Commonwealth entity. The Act requires that inspections, repairs, or replacements of the electrical cables, cable looms, and other components of the propeller anti-ice system be conducted in accordance with specified service bulletins. Modifications to the engine intake and propeller anti-ice electrical system are also mandated to prevent future heat damage. The directive applies to any flight following the effective date of the amendment, which was 17 March 1999, and compliance must be achieved before further flight or at the next 100-hour inspection, whichever comes first. This Act does not specify any exclusions or exemptions, and its application can be further detailed through subordinate instruments as necessary.
Key Provisions
The Civil Aviation Regulations 1998, specifically Part 39 - 105, outlines the Civil Aviation Safety Authority's (CASA) Schedule of Airworthiness Directives for the Pilatus Britten-Norman BN-2 Series Aeroplanes. The particular Airworthiness Directive AD/BN-2/64 Amendment 1 pertains to the propeller anti-ice system and applies to BN2T series Islander aeroplanes that do not have the NB-M-1662 modification (Section 4/99 DM). This directive mandates several key actions to ensure the safety of the aircraft’s anti-ice system.
Firstly, operators must inspect the electrical cables, cable looms, and other components of the propeller anti-ice system in accordance with Pilatus Britten-Norman Aircraft Manufacturers Service Bulletin (SB) BN2/SB.250 dated 6 July 1998 (Requirement 1). If any of the cables or components are found to be unserviceable during this inspection, they must be either repaired or replaced (Requirement 2). Additionally, operators are required to modify the engine intake and propeller anti-ice electrical system in accordance with Britten-Norman SB BN2/SB.250 Issue 2 dated 1 December 1998 (Requirement 3). Both service bulletins have been classified as Mandatory by the Civil Aviation Authority (UK), and this directive references CAA(UK) AD 005-07-98.
The obligations under this Airworthiness Directive include ensuring that the inspection and necessary repairs or modifications are completed before any further flight. Specifically, the inspection must be carried out before further flight after 11 November 1998 (Compliance 1). If any unserviceable components are found, they must be addressed before further flight (Compliance 2). The modification of the engine intake and propeller anti-ice electrical system must be completed at the next 100-hour inspection after the effective date of this amendment, or by 17 June 1999, whichever comes first (Compliance 3). This amendment became effective on 17 March 1999.
Failure to comply with this Airworthiness Directive may result in significant safety risks, including the potential for electrical failures that could lead to in-flight hazards. The regulations do not explicitly state penalties for non-compliance within the directive itself, but general civil aviation legislation and CASA guidelines provide for enforcement actions which may include fines and the grounding of non-compliant aircraft. The severity of penalties would depend on the extent of the non-compliance and any resulting safety incidents.