Sofema Online (SOL) Considers Specific Roles and Responsibilities related to Design & Production

Introduction - State of Design Responsibilities

The State of Design (the state having jurisdiction over the organization responsible for the type design) holds the primary technical knowledge of the aircraft.

• Their responsibilities focus on ensuring the design remains safe throughout the life of the aircraft type.

Transmission of mandatory continuing airworthiness information (e.g., Airworthiness Directives)

Requirement: The State of Design must transmit any generally applicable information necessary for the continuing airworthiness and safe operation of the aircraft (including engines and propellers) to every State of Registry and to any other Contracting State upon request.

• This is commonly known as Mandatory Continuing Airworthiness Information (MCAI), such as Airworthiness Directives.

Rationality: The State of Design is the authority that approved the original type design and possesses the detailed technical data to evaluate unsafe conditions.

• When a defect or unsafe condition is discovered in one aircraft, it is likely to exist in others of the same type.

• Global safety depends on the State of Design proactively pushing this critical safety information to every state where the aircraft operates so that necessary modifications or inspections can be mandated worldwide.

System for receiving failure/defect information

Requirement: The State of Design must ensure there is a system for receiving information on faults, malfunctions, defects, and other occurrences that might cause adverse effects on continuing airworthiness.

Rationality: No design is perfect, and operational stresses can reveal issues not predicted during certification. To maintain safety, the State of Design needs a continuous "feedback loop" from the aircraft's actual operation.

• By receiving failure data from operators globally, the State of Design can analyze trends, identify systemic design flaws, and develop the necessary corrective actions (MCAI) mentioned above.

Continuing structural integrity programmes for large aeroplanes

Requirement: For aeroplanes over 5,700 kg maximum certificated take-off mass, the State of Design must ensure the existence of a continuing structural integrity programme, including specific information on corrosion prevention and control.

Rationality: Large transport aircraft often have long operational service lives (decades).

• Over time, they are subject to fatigue cycles and environmental corrosion that were modeled but not physically experienced when the aircraft was new.

• This responsibility ensures that there is a proactive, scheduled plan to detect and repair structural degradation before it leads to catastrophic failure, ensuring the airframe remains airworthy as it ages.

State of Manufacture Responsibilities

The State of Manufacture is the state that has jurisdiction over the organization responsible for the aircraft's final assembly.

Cooperation with State of Design

Requirement: When the State of Manufacture is not the State of Design, there must be an agreement acceptable to both States to ensure the manufacturing organization cooperates with the organization responsible for the type design in assessing information on the design, manufacture, and operation of the aircraft.

Rationality: Manufacturing and Design are distinct but interconnected.

• A safety issue might arise from how a part is built (manufacturing) rather than how it was designed, or a design change might be needed to accommodate a manufacturing limitation.

• Full cooperation ensures that the entity building the aircraft has access to the approved design data and that the designers are aware of any production issues that could compromise airworthiness.

• This prevents gaps in oversight where production defects could go unnoticed by the design authority.

State of Registry Responsibilities

The State of Registry is the state on whose register the aircraft is entered. They are responsible for the oversight of specific individual aircraft operating under their flag.

Adopting mandatory continuing airworthiness information

Requirement: Upon receipt of mandatory continuing airworthiness information (like Airworthiness Directives) from the State of Design, the State of Registry must adopt the mandatory information directly or assess it and take appropriate action.

Rationality: While the State of Design determines what needs to be fixed to ensure safety, they have no legal authority over aircraft registered in other countries. The State of Registry provides the legal enforcement.

• By adopting the State of Design's mandates, the State of Registry ensures that the specific aircraft under its jurisdiction are legally required to implement the necessary safety fixes to remain airworthy.

Monitoring, maintenance, and Structural Integrity

Requirement: The State of Registry must develop or adopt requirements to ensure the aircraft is maintained in an airworthy condition and continues to comply with airworthiness requirements after modifications or repairs.

Rationality: An aircraft is only airworthy if it is maintained correctly.

• The State of Registry serves as the local oversight authority, ensuring the operator is performing the maintenance tasks, inspections, and structural integrity programs required by the State of Design.

• Without this monitoring, an operator might neglect necessary maintenance, rendering the aircraft unsafe despite proper regulations.

Reporting faults, malfunctions, and defects to the State of Design

Requirement: For aeroplanes over 5,700 kg and helicopters over 3,175 kg, the State of Registry must have a system to transmit information on faults, malfunctions, defects, and other occurrences that might cause adverse effects on continuing airworthiness to the organization responsible for the type design.

Rationality: This closes the safety data loop. Operators report defects to their local State of Registry. The State of Registry must then forward this data to the State of Design.

• Without this transmission, the State of Design would be blind to failures occurring in foreign fleets, preventing them from identifying global safety trends or issuing necessary Airworthiness Directives.

Transmission of sensitive aviation security information

Requirement: The State of Registry must ensure that sensitive aviation security information is securely transmitted to the appropriate authority in the State of Design.

Rationality: Airworthiness often overlaps with security (e.g., reinforced cockpit doors, least-risk bomb locations).

• If a security flaw is found or if sensitive design details regarding security features need to be shared to fix a defect, this information must be transmitted through secure channels.

• If transmitted openly, this data could be exploited by malicious actors, compromising the security of the entire fleet.

Next Steps

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