AD/BEECH 18/20 - Lower Rudder Torque Tube - Inspection

Overview

The Civil Aviation Regulations 1998, administered by the Civil Aviation Safety Authority, aim to ensure the safety and reliability of aircraft operations within Australia. One particular legislative instrument under this regulation is F2006B03619, which pertains to the Beechcraft 18 Series aeroplanes. This legislative instrument was enacted to address a specific safety concern identified in the lower rudder torque tube of these aircraft models. The problem it was introduced to address involved the potential for cracks in the lower rudder torque tube, which could compromise the aircraft's structural integrity and operational safety. The objective is to mandate regular inspections and, if necessary, the repair or replacement of the affected component to maintain airworthiness standards. This ensures that the aircraft remain safe for continued operation and aligns with international safety directives, such as those issued by the Federal Aviation Administration in the United States.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, pertains to the Civil Aviation Safety Authority's (CASA) Schedule of Airworthiness Directives, with AD/BEECH 18/20 detailing the requirements for the inspection of the lower rudder torque tube on Beechcraft 18 Series aeroplanes. This directive applies to all models D18C, D18S, E18S, E18S-9700, G18S, H-18, C-45G, TC-45G, C-45H, TC-45J (SNB-5), JRB-6, 3N, 3M, and 3NM that have been modified according to specific STCs (Supplemental Type Certificates). The regulation mandates that these aircraft must undergo a visual inspection of the lower rudder torque tube P/N 452606-7 for any cracks located at the area of the access hole. The inspection must be completed within 100 hours of time in service following 30 June 1978 and then at intervals not exceeding 100 hours of time in service. The directive permits the repair of tubes with cracks not exceeding 0.50 inches, provided the repair scheme has been approved by the Secretary; if the cracks exceed this length, the tube must be replaced prior to further flight. The directive extends its reach across the Commonwealth of Australia, applying uniformly across all states and territories under CASA's jurisdiction.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, outlines a directive concerning the airworthiness of Beechcraft 18 Series aeroplanes, detailed in AD/BEECH 18/20 (section 6/78). This directive mandates a visual inspection of the lower rudder torque tube, part number 452606-7, focusing on the area around the access hole for any signs of cracks. The directive applies to all models including D18C, D18S, E18S, E18S-9700, G18S, H-18, C-45G, TC-45G, C-45H, TC-45J (SNB-5), JRB-6, 3N, 3M, and 3NM, which have been modified in accordance with STC SA 1243WE, S1016WE, or SA360WE. The obligation under this directive requires that the lower rudder torque tube be inspected within 100 hours of time in service following 30 June 1978, and subsequently at intervals not exceeding 100 hours of time in service. This ensures that any potential structural weaknesses are identified and addressed promptly to maintain the safety and airworthiness of the aircraft. If cracks are found in the tube, those that measure up to 0.50 inch (12.5 mm) may be repaired, provided the repair scheme is approved by the Secretary. However, if the cracks exceed 0.50 inch, the tube must be replaced before any further flight can occur. Failure to comply with these airworthiness directives can result in serious consequences. The regulations impose a duty on the operators and owners of the affected aircraft to ensure that the inspections and necessary repairs or replacements are carried out as required. Non-compliance with these provisions can lead to civil or criminal penalties, including fines and potential grounding of the aircraft. The maximum penalties are not explicitly stated in the provided text, but they can be severe, reflecting the critical nature of maintaining aircraft safety and airworthiness.