AD/CESSNA 560/3 - Outflow Safety Valve

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 105, establish the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives. This legislative instrument was enacted to ensure the ongoing safety of aircraft by mandating specific actions and compliance with safety directives. AD/CESSNA 560/3 pertains to the Cessna 560 (Citation V) Series Aeroplanes, addressing an issue with outflow safety valves that had shown signs of cracking, potentially leading to rapid decompression. The directive requires compliance within 200 hours of time in service from 25 April 1996 or before 31 July 1996, whichever comes first, aligning with Allied Signal Service Bulletin 103576-21-4055, and references FAA AD 95-25-10 Amdt 39-9456. This directive aims to mitigate risks associated with the identified safety issue by ensuring timely corrective actions are implemented by aircraft operators.

Scope and Application

The Civil Aviation Safety Authority (CASA) has issued an Airworthiness Directive (AD) under the Civil Aviation Regulations 1998, specifically targeting all Cessna 560 series aircraft. This directive mandates that unless previously addressed, operators must implement the actions outlined in Allied Signal Service Bulletin 103576-21-4055. This requirement is set to ensure the integrity of the outflow safety valve, which is crucial in preventing rapid decompression of the aircraft. The directive references FAA AD 95-25-10 Amdt 39-9456, indicating a coordinated international effort to address this safety issue. Operators must comply with these requirements within 200 hours of the aircraft's time in service from 25 April 1996 or before 31 July 1996, whichever comes first, to mitigate the risk posed by the cracking of the valve poppets that have been identified in a specific batch of the aircraft. The directive applies nationally across Australia, overseen by CASA, ensuring uniform compliance among all operators of Cessna 560 series aircraft within the Commonwealth.

Key Provisions

The key operative sections of the Civil Aviation Regulations 1998, Part 39 - 105, pertaining to the Cessna 560 (Citation V) Series Aeroplanes, particularly focus on the outflow safety valve directive AD/CESSNA 560/3. This directive, as per section 39.105, mandates specific actions to be taken for all Cessna 560 series aircraft. The requirement is to follow the instructions set out in Allied Signal Service Bulletin 103576-21-4055. This directive ensures that operators take corrective action to address the risk of cracking in the valve poppets, which could potentially lead to catastrophic failure of the outflow safety valve and subsequent rapid decompression of the aircraft. The directive cross-references FAA AD 95-25-10 Amendment 39-9456 for additional guidance. Operators and entities governed by these regulations are required to ensure compliance with the outflow safety valve directive within a specified timeframe. As per section 39.105, the action must be completed within 200 hours of time in service from 25 April 1996 or before 31 July 1996, whichever is earlier. This imposes a strict obligation on operators to either perform the necessary maintenance as per the Allied Signal Service Bulletin or ensure that the aircraft does not exceed the specified operational hours without addressing the directive. The directive aims to maintain the airworthiness and safety of the Cessna 560 series aircraft by preemptively addressing a known manufacturing defect. Failure to comply with the directive can result in severe consequences. Although the specific penalties are not detailed within the text provided, non-compliance with airworthiness directives typically attracts significant civil and criminal penalties under the Civil Aviation Act 1988. Civil penalties may include fines, while criminal penalties can result in imprisonment, reflecting the gravity of ensuring compliance to prevent potential mid-air hazards. Operators found in breach of such directives may also face operational restrictions, grounding of the affected aircraft, and potential revocation of airworthiness certificates, further emphasising the critical nature of adhering to the specified safety measures.