Definition:Aviation war risk exclusion (AVN 48B)
🛡️ Aviation war risk exclusion (AVN 48B) is the standard market clause used in aviation insurance policies to exclude hull losses caused by war, terrorism, hijacking, and allied perils from the scope of the base all-risks cover. Promulgated by the Lloyd's Market Association, AVN 48B is the hull-side companion to AVN 52, which performs the equivalent function for third-party liability. Virtually every airline hull policy written in the global market incorporates AVN 48B — or a closely equivalent clause — making it one of the most consequential pieces of standard wording in all of commercial insurance.
🔧 The clause removes from the all-risks hull policy any loss, damage, or expense arising from war (whether declared or not), invasion, civil war, revolution, insurrection, military or usurped power, strikes, riots, civil commotions, acts of terrorism, malicious acts, hijacking, confiscation, nationalization, seizure, restraint, and detention by any government or public authority. Once AVN 48B strips these perils, the insured airline or operator must procure separate aviation war risk hull coverage, typically written as a standalone policy or as a write-back endorsement through the specialist war risk market. Notably, the cancellation provisions embedded in AVN 48B — particularly the seven-day automatic termination triggered by the outbreak of war between major powers — have been the subject of intense market focus during periods of geopolitical tension, as they can leave insureds temporarily unprotected if replacement coverage is not arranged in time.
🌐 The global significance of AVN 48B crystallized after September 11, 2001, when insurers invoked cancellation clauses and briefly withdrew war risk coverage from the entire commercial aviation sector. This market dislocation compelled governments worldwide to establish backstop mechanisms — including programs administered by the U.S. Federal Aviation Administration, the UK Department for Transport, and similar bodies in France, Germany, and Australia — to keep airlines flying. The episode permanently reshaped the architecture of aviation war risk placement and prompted revisions to AVN 48B's drafting to provide clearer triggers and notice periods. For brokers structuring aviation programs today, the precise interaction between AVN 48B, the AVN 46B write-back, and any government pool participation remains one of the most technically demanding aspects of program design.
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