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📋 '''Certificate of airworthiness (C of A)''' is the formal regulatory document — issued by a state's civil aviation authority — that attests an individual aircraft conforms to its approved type design and is in a condition for safe operation. In the [[Definition:Aviation insurance | aviation insurance]] industry, the C of A functions as a gateway condition for coverage: [[Definition:Hull insurance | hull all-risks]] and [[Definition:Aviation liability insurance | liability]] policies almost universally stipulate that the insured aircraft must hold a valid C of A, and operating without one can constitute a [[Definition:Warranty | warranty]] breach with potentially coverage-voiding consequences. The term is used interchangeably with "[[Definition:Airworthiness certificate | airworthiness certificate]]" in many markets, though specific jurisdictions may draw subtle regulatory distinctions between standard, restricted, special, and export certificates.

🔍 Obtaining a C of A requires the aircraft to pass a comprehensive inspection regime that verifies structural integrity, systems functionality, and compliance with all applicable [[Definition:Airworthiness directive | airworthiness directives]] and manufacturer service bulletins. The certificate is not perpetual — continued validity depends on adherence to an approved maintenance program, typically overseen by an authorized maintenance organization. For [[Definition:Underwriter | underwriters]], the status of an aircraft's C of A is a core underwriting data point collected at inception and monitored throughout the policy period. When an aircraft is grounded pending maintenance, undergoing modification, or stored without a valid certificate, the nature and scope of available insurance coverage changes materially — often shifting from full operational cover to a more limited [[Definition:Ground risk hull insurance | ground-risk-only]] or storage form.

🌐 Cross-border recognition of C of A documents is governed by the Chicago Convention (ICAO) framework, which requires contracting states to recognize certificates issued by other member states provided they meet minimum standards. In practice, significant regulatory variation exists: EASA issues C of A documents under Part 21 for EU member states, the FAA administers its own certification under 14 CFR Part 21 in the United States, and authorities in China, Japan, Brazil, and elsewhere maintain independent regimes. For [[Definition:Aircraft lessor | lessors]], [[Definition:Aviation finance | financiers]], and their insurers, navigating these parallel systems is a routine but critical task — particularly during aircraft transfers between operators in different jurisdictions, where re-certification or validation of the C of A by the importing state's authority is typically required before insurance coverage for revenue operations can be confirmed.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Airworthiness certificate]]
* [[Definition:Airworthiness directive]]
* [[Definition:Aviation insurance]]
* [[Definition:Warranty]]
* [[Definition:Hull insurance]]
* [[Definition:Ground risk hull insurance]]
{{Div col end}}

Definition:Certificate of airworthiness (C of A) - Revision history

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