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📋 '''Foreign object damage (FOD)''' describes physical harm to an aircraft — particularly its engines — caused by the ingestion or impact of objects not native to the aircraft's structure or systems. In [[Definition:Aviation insurance | aviation insurance]], FOD is one of the most frequently encountered causes of [[Definition:Hull insurance | hull]] and engine claims, ranging from minor compressor blade nicks to catastrophic [[Definition:Engine failure | engine failure]] following bird strikes, runway debris ingestion, or the intake of loose hardware. The term is deeply embedded in both aviation safety and insurance vocabulary, serving as a standard loss category in [[Definition:Claims management | claims]] reporting and [[Definition:Underwriting | underwriting]] analysis.

⚙️ When a FOD event occurs, the aircraft operator typically initiates an inspection and damage assessment, often grounding the aircraft until engineers confirm whether repairs or component replacements are necessary. From the insurance perspective, the claim pathway depends on the policy structure: damage to the aircraft's engines and airframe generally falls under the [[Definition:Hull all-risks | hull all-risks]] section of the aviation policy, while any resulting [[Definition:Business interruption insurance | loss of use]] or revenue impact may be covered by a separate [[Definition:Loss of use insurance | loss of use]] endorsement. [[Definition:Underwriter | Underwriters]] scrutinize an operator's FOD prevention programs — including runway inspection protocols, maintenance discipline, and airport management standards — when assessing risk. [[Definition:Loss adjuster | Loss adjusters]] specializing in aviation evaluate whether the damage was indeed caused by a foreign object and determine the repair cost, which for modern turbofan engines can run into millions of dollars for a single event.

✈️ FOD's significance to the aviation insurance market goes beyond individual claims. Aggregate FOD losses represent a material portion of the attritional [[Definition:Loss ratio | loss ratio]] for aviation hull portfolios, and trends in FOD frequency inform both pricing and [[Definition:Loss reserve | reserving]] decisions. Airlines operating in regions with less-developed airport infrastructure or in environments prone to bird activity face elevated FOD risk, which underwriters factor into regional rate differentials. Advances in engine design — such as composite fan blades and protective inlet systems — have altered the damage profile, sometimes reducing the frequency of minor events while increasing the severity when major ingestions do occur. For insurers and reinsurers, tracking FOD patterns remains an essential part of managing aviation portfolio performance.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Aviation insurance]]
* [[Definition:Hull all-risks]]
* [[Definition:Bird strike]]
* [[Definition:Engine failure]]
* [[Definition:Loss of use insurance]]
* [[Definition:Hull insurance]]
{{Div col end}}

Definition:Foreign object damage (FOD) - Revision history

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