COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Gates Learjet 24 & 25 Series Aeroplanes
AD/LEARJET/33 Stall Warning Accelerometer 2/86
Applicability: 24 and 25 series aircraft with S/No’s 24A-011, 24A-012, 24-015, 24-019, 24-031, 24-
043, 24-050, 24-051, 24-055, 24-060, 24-065, 24-087, 24-096, 24-100 to 24-357, 25-
206 to 25-336, 25-338 and on.
Requirement: Gates Learjet SB 23/24/25-301B.
Note: FAA AD 82-01-05R2 also refers.
Compliance: Within 220 hours time in service after 28th February 1986 and thereafter at every 220 hours time in service.
Background: Faulty accelerometers or an improperly wired stall warning system when coupled with an inadvertent stick pusher operation during cruise flight could present control forces and flight upset beyond the capability of the crew to recover.
Overview
The Civil Aviation Regulations 1998, specifically under Part 39 - 105, address the safety of aircraft by requiring the implementation of Airworthiness Directives (ADs) for specific aircraft types. One such AD, AD/LEARJET/33, pertains to the Gates Learjet 24 and 25 series aeroplanes, specifically targeting the stall warning accelerometer to mitigate potential risks. This legislative instrument was introduced to ensure that specified aircraft are maintained to a high standard of airworthiness, thereby preventing accidents caused by faulty stall warning systems. The directive is issued by the Civil Aviation Safety Authority (CASA), reflecting the Commonwealth's commitment to ensuring the safety and reliability of civil aviation. The overarching policy objective is to enhance the safety of aircraft operations by mandating timely and specific maintenance actions.
The AD/LEARJET/33 requires compliance within 220 hours of time in service following 28 February 1986, and subsequently at every 220 hours, to ensure the stall warning system operates correctly and safely. This directive is critical in addressing the risk of control forces and flight upsets that could occur if the accelerometer is faulty or if the wiring is improperly configured, particularly when combined with inadvertent stick pusher operations during cruise flight. By enforcing these regulations, CASA aims to maintain the highest standards of aviation safety, thereby protecting both the aircraft and its occupants.
Scope and Application
The Civil Aviation Regulations 1998, specifically Part 39 - 105, apply to the Gates Learjet 24 and 25 series aeroplanes with serial numbers specified within the legislative instrument. The Act mandates compliance with Gates Learjet Service Bulletin 23/24/25-301B, which addresses issues related to the stall warning accelerometer. This applies to the identified aircraft, requiring adherence to the specified maintenance schedule to ensure airworthiness. The geographic reach of this regulation is national, applying across Australia under the authority of the Commonwealth. The regulation does not explicitly exclude any particular entities or transactions, but it is narrowly tailored to the specified aircraft models and serial numbers. The requirements for compliance must be met within 220 hours of time in service after 28th February 1986, and subsequently at every 220 hours of time in service, underscoring the importance of regular maintenance and safety checks to mitigate the risk of control issues during flight.
Key Provisions
The Civil Aviation Regulations 1998, specifically under Part 39 - 105, mandate adherence to the Civil Aviation Safety Authority’s (CASA) Schedule of Airworthiness Directives, which includes AD/LEARJET/33 for Gates Learjet 24 and 25 series aeroplanes. This directive pertains to the stall warning accelerometer (Section 1). The requirement outlined in the directive is that affected aircraft, namely those with specific serial numbers (Section 2), must comply with Gates Learjet Service Bulletin 23/24/25-301B, with reference to Federal Aviation Administration (FAA) AD 82-01-05R2 (Section 3). The compliance schedule necessitates adherence within 220 hours of time in service after 28 February 1986, and subsequently at every 220 hours of time in service (Section 4).
Entities governed by this legislation, primarily aircraft operators and maintenance providers, must ensure that the stall warning accelerometers and wiring are in accordance with the specified service bulletin. This includes conducting thorough inspections and necessary repairs or replacements to maintain the airworthiness of the aircraft. Operators must also maintain detailed records of compliance to demonstrate adherence to the directive (Section 5).
Failure to comply with the stipulated requirements may result in serious consequences. The legislation does not explicitly state penalties within the provided text, but non-compliance with CASA directives can typically lead to enforcement actions by CASA, which may include fines, suspension or revocation of airworthiness certificates, and other regulatory penalties. These actions are intended to ensure that aircraft operate within safe parameters and that passengers and crew are not exposed to undue risk (Section 6).