AD/DHC-8/1 - Ground and Roll Control Spoilers

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of Australia, is designed to regulate and ensure the safety of civil aviation within Australian airspace. One particular legislative instrument under this act, F2006B09164, pertains to Airworthiness Directives for Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes. This instrument was introduced to address specific safety concerns associated with the operation of these aircraft models, particularly focusing on the ground and roll control spoilers. The policy objective is to ensure that the modifications to the landing gear proximity switch electronic unit, the electrical power phase supply, and the reactivation of previously deactivated equipment meet safety standards to prevent uncommanded deployment and loss of lift during critical flight phases. Compliance with these directives is mandatory before a Certificate of Airworthiness can be issued.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, pertains to Airworthiness Directives issued by the Civil Aviation Safety Authority (CASA). This legislation mandates modifications for the Bombardier (Boeing Canada/De Havilland) DHC-8 series aeroplanes, applicable to those with serial numbers 003 and above. The directive requires compliance with certain technical modifications to ensure the safe operation of the aircraft, specifically relating to the landing gear proximity switch electronic unit, the electrical power phase supply, and the re-installation of deactivated equipment. The directive is mandatory and must be adhered to before issuing a Certificate of Airworthiness, ensuring that the aircraft meet necessary safety standards. The legislation extends its reach to all operators of the specified DHC-8 models, ensuring that modifications are uniformly implemented across the industry to maintain safety standards. The applicability of this directive is limited to the specified model and serial numbers, and compliance is overseen by CASA, with any deviations subject to regulatory scrutiny.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, outlines a schedule of airworthiness directives that govern the maintenance and operational safety of aircraft. One such directive, AD/DHC-8/1, pertains to Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes, focusing on the ground and roll control spoilers. This directive applies to the DHC-8 model with serial numbers 003 and subsequent. The primary requirement of this directive is to modify the landing gear proximity switch electronic unit (PSEU) in accordance with De Havilland Service Bulletin No. 8-32-54 Revision B, and to modify the electrical power phase supply for the PSEU BITE power circuit as per De Havilland Service Bulletin No. 8-32-55 Revision A. Additionally, the directive mandates the removal of a placard and the reinstatement of equipment previously deactivated by Transport Canada AD CF-86-11 R2 Para 1, 2, and 3, in accordance with De Havilland Service Bulletin No. 8-27-34 Revision C. It is critical to note that compliance with either Transport Canada AD CF-86-11 R2 or FAA AD 86-14-51 R1 does not ensure compliance with this AD unless specific reference is made to the terminating actions of the referenced Service Bulletins. Under this directive, operators of the affected aircraft must ensure that the specified modifications are completed before a Certificate of Airworthiness is issued. The directive underscores the necessity of these modifications to prevent uncommanded deployment of ground spoilers and roll control spoilers, which could lead to a hazardous loss of lift during critical phases of flight. The modifications allow for the removal of operational limitations and the re-establishment of normal use of all spoilers in the ground mode. The background provided highlights that the deactivation of ground and roll control spoilers was a precautionary measure, and the modifications specified in the directive are intended to restore normal functionality while ensuring safety. Operators of the DHC-8 Series Aeroplanes governed by this airworthiness directive must adhere to strict compliance requirements. This includes ensuring that the modifications outlined in the directive are completed by certified personnel, following the specific instructions provided in the referenced service bulletins. Additionally, operators must maintain records of all modifications carried out in compliance with the directive to demonstrate adherence to regulatory standards. Failure to comply with the requirements of this directive can result in serious safety implications, including potential grounding of the aircraft until the necessary modifications are performed. The consequences for non-compliance with the airworthiness directive AD/DHC-8/1 are significant. The Civil Aviation Regulations 1998 impose strict penalties for failure to adhere to the specified modifications and compliance timelines. Non-compliance can lead to enforcement actions by the Civil Aviation Safety Authority (CASA), which may include the suspension or revocation of the aircraft’s Certificate of Airworthiness. Operators found in breach of the directive may also face civil penalties, which can include fines and other sanctions. In severe cases, criminal charges could be brought against responsible individuals, resulting in imprisonment or substantial fines. Therefore, it is imperative for operators to ensure full compliance with all provisions of this airworthiness directive to avoid these serious repercussions.