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🔧 '''Spares coverage''' is a component of [[Definition:Aviation insurance | aviation insurance]] that protects the [[Definition:Insured | insured's]] inventory of aircraft spare parts, engines, and components against physical loss or damage while in storage, transit, or temporarily installed on aircraft. Because spare parts represent a substantial capital investment for airlines, [[Definition:Maintenance, repair, and overhaul (MRO) | MRO]] providers, and leasing companies, this coverage fills a critical gap that a standard [[Definition:Aviation hull insurance | hull]] policy — which typically covers only installed components on a specific airframe — would not address. Spares coverage may be written as a standalone policy or as an endorsement to an existing aviation hull program, depending on the insured's needs and the [[Definition:Underwriter | underwriter's]] preference.

⚙️ Policies are generally written on an [[Definition:All-risks | all-risks]] basis, covering perils such as fire, theft, flood, transit damage, and accidental breakage, subject to specified [[Definition:Exclusion | exclusions]] and a [[Definition:Deductible | deductible]]. The [[Definition:Sum insured | sum insured]] is typically set as a declared aggregate value representing the insured's total spare-parts inventory, and premiums are rated against that declared value. Some programs use a reporting form, under which the insured periodically reports fluctuating inventory values and premiums adjust accordingly — a structure suited to large airlines whose spares holdings change as engines cycle through overhaul. Geographic scope matters: parts may be held at the insured's own facilities, at third-party [[Definition:Maintenance, repair, and overhaul (MRO) | MRO]] shops worldwide, or in bonded warehouses, and the policy must contemplate all relevant locations and transit legs. Underwriters also pay attention to engine pools and exchange programs, where components may be shared among operators under contractual arrangements that require careful allocation of insurable interest.

📦 From a risk-management perspective, spares coverage is essential because a single widebody engine can be valued at tens of millions of dollars, and an airline's total rotable-parts inventory can rival or exceed the insured value of several aircraft. Gaps in this coverage can leave an operator financially exposed to catastrophic warehouse fires, natural disasters at storage locations, or damage during shipment. For [[Definition:Insurance broker | brokers]], structuring spares programs requires a detailed understanding of the client's supply chain, storage network, and engine management contracts. The coverage also intersects with [[Definition:Cargo insurance | cargo insurance]] when parts are in transit and with [[Definition:Property insurance | property insurance]] when stored at fixed locations, so delineating coverage boundaries is important to avoid both gaps and overlaps.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Aviation hull insurance]]
* [[Definition:Aviation insurance]]
* [[Definition:Maintenance, repair, and overhaul (MRO)]]
* [[Definition:Sum insured]]
* [[Definition:All-risks]]
* [[Definition:Cargo insurance]]
{{Div col end}}

Definition:Spares coverage - Revision history

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