AD/LEARJET 35/14 Amdt 1 - Tailcone Service Area - Inspection

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 105, under the authority of the Civil Aviation Safety Authority, address the safety risks associated with the Gates Learjet 35 and 36 series aeroplanes. Enacted to ensure the safety and reliability of these aircraft models, this legislation focuses on the prevention of fires or explosions caused by undetected leakage of flammable fluids in the tailcone service area. The regulations mandate that all models 35 and 36, except those incorporating Modification Kit No. AMK 80-7, require immediate post-flight inspections of the tailcone service area to check for leaks, clear vents and drains, and replace any leaking motive flow valves. This requirement is integral to maintaining the airworthiness of these aircraft and preventing hazardous situations that could arise from unaddressed fluid leaks. Compliance with these directives is mandatory after every flight until the aircraft are modified to include AMK 80-7.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105 and the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, applies to all Gates Learjet 35 and 36 series aeroplanes that do not incorporate Modification Kit No. AMK 80-7. This legislation is a Commonwealth regulation, thereby affecting all aircraft operating within Australian airspace. Its purpose is to mandate immediate post-flight inspections of the tailcone service area to ensure safety, specifically addressing potential issues such as leaks from motive flow valves and obstructions in vents and drains. The requirement mandates that these inspections be conducted after every flight until the aircraft is modified with AMK 80-7, which eliminates the need for such inspections. This directive is intended to prevent the risk of fire or explosion due to undetected leakage of flammable fluids in the tailcone service area. The inspection and compliance can be performed and certified by the pilot in command, as referenced in the Federal Aviation Administration (FAA) AD 80-19-09, Amendment 39-3913.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105 under the Civil Aviation Safety Authority Schedule of Airworthiness Directives, includes AD/LEARJET 35/14 Amendment 1, which pertains to the tailcone service area inspection of Gates Learjet 35 and 36 series aeroplanes (Section 12/80). The regulation requires that immediately after shutting down the engines, the tailcone service area access cover must be opened, and a thorough inspection must be conducted. This inspection involves checking the motive flow valves for any leaks or stains that might indicate leakage, ensuring all vents and drains are clean and free from obstruction, and replacing any leaking motive flow valves with new or factory-rebuilt valves before further flight. The access cover must then be secured. This inspection may be performed and certified by the pilot in command, as noted in the directive. The Act imposes several obligations on the operators of Gates Learjet 35 and 36 series aeroplanes. Primarily, it mandates a post-flight inspection of the tailcone service area by opening the access cover and checking for leaks or obstructions. Operators must ensure that any detected leaks in the motive flow valves are rectified by replacing the faulty valves before any subsequent flight. Compliance with these requirements is necessary after every flight until the aircraft is modified with modification kit AMK 80-7, which eliminates the need for such inspections. The directive aims to mitigate the risk of fire or explosion that may result from undetected leakage of flammable fluids in the tailcone service area. Failure to comply with the provisions of AD/LEARJET 35/14 Amendment 1 may lead to serious safety risks. The regulation highlights that undetected leaks in the tailcone service area can result in fire or explosion, which underscores the critical nature of adhering to the specified inspection procedures. While the specific civil or criminal consequences for non-compliance are not detailed within the text, it can be inferred that such non-compliance could lead to safety incidents, potentially resulting in severe penalties under broader aviation safety laws. The regulation references FAA AD 80-19-09, Amendment 39-3913, indicating that similar stringent measures are upheld internationally, further emphasising the importance of compliance.