AD/VAT/18A - Limitation of Flap Movement - Modification

Overview

The Civil Aviation Regulations 1998, enacted by the Australian Parliament, were designed to establish a comprehensive regulatory framework governing all aspects of civil aviation within Australia. This includes ensuring the airworthiness of aircraft, which is fundamental to maintaining high safety standards in the aviation industry. One specific aspect addressed by these regulations is the issue of ensuring the operational safety of particular aircraft models through Airworthiness Directives (ADs). ADs are legally enforceable rules aimed at correcting an unsafe condition on an aircraft. The AD in question, AD/VAT/18A, targets Victa and A.E.S.L. Airtourer Series Aeroplanes, specifically mandating modifications to the flap selector quadrant to limit flap movement to the first three positions, thereby mitigating potential safety risks associated with the fourth flap position. Compliance with such directives is crucial to ensuring the continued airworthiness of these aircraft and maintaining the overall safety of civil aviation in Australia.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, encompasses the Airworthiness Directives issued by the Civil Aviation Safety Authority, with AD/VAT/18A detailing the requirement for modifying the flap selector quadrant on certain Victa and A.E.S.L. Airtourer series aeroplanes. This directive applies to Victa Airtourer 100 and 115 models, as well as AESL model 115 aeroplanes with specific serial numbers, excluding 506 and 509. The directive mandates that the flap selector quadrant be modified to restrict the selection to the first three positions, following either Victa Service Bulletin No. 34 or Victa Modification No. B129. In certain circumstances, Victa Modification No. B129 can be removed if specific conditions are met, including compliance with Air Navigation Order AD/VAT/34 and subsequent test flights by a qualified pilot to assess the aircraft's handling and controllability with the fourth flap notch extended. Compliance with these modifications is required before 1 September 1971, and a signed flight test report must be submitted to the Secretary within seven days of the test flight completion.

Key Provisions

The Civil Aviation Regulations 1998, specifically in Part 39 - 105, address the airworthiness directives for the Victa and A.E.S.L. Airtourer Series Aeroplanes, particularly regarding the limitation of flap movement (AD/VAT/18A). The regulation mandates modifications to the flap selector quadrant to allow only the first three positions to be selected. This can be achieved either by modifying the quadrant in accordance with Victa Service Bulletin No. 34 or Victa Modification No. B129, or by removing Victa Modification No. B129 (SB No. 34) following the incorporation of Air Navigation Order AD/VAT/34, provided the aircraft undergoes a test flight conducted by a pilot endorsed for the type and holding at least a Commercial Pilot Licence. This test flight is crucial to ensure that the aircraft’s handling and controllability remain satisfactory with the fourth notch of the flap extended. The tests must assess whether there is any excessive wing drop or other undesirable characteristics during both stalled power "on" and "off" in level and turning flight, as well as whether safe approaches and landings can be executed under normal conditions. Entities and individuals governed by these regulations must adhere to the specified modifications and test flight requirements. This includes ensuring that any modifications are correctly implemented as per the directives provided by Victa SB No. 34 or Victa Modification No. B129, or, if applicable, ensuring that the aircraft is properly tested after the removal of Victa Modification No. B129. After the test flight, a signed flight test report must be submitted to the Secretary within seven days. Failure to comply with these requirements can lead to non-compliance with airworthiness standards, potentially rendering the aircraft unsafe for operation. Failure to comply with the airworthiness directives outlined in the Civil Aviation Regulations 1998 can result in serious consequences. The regulations do not specify particular offences or penalties within this section; however, non-compliance with airworthiness directives generally can lead to enforcement actions by the Civil Aviation Safety Authority (CASA). Such actions may include fines, suspension or revocation of the aircraft’s certificate of airworthiness, and potentially criminal charges if the non-compliance results in an accident or endangers public safety. The exact penalties for non-compliance are determined based on the severity of the breach and the associated risks, but they can be significant, reflecting the critical nature of ensuring aircraft airworthiness.