Critical Spare Parts Stock
Critical spare parts stock records the extent to which components with long replacement lead times for bottleneck machinery are held in stock, contractually reserved or otherwise secured, as queried in machinery and business interruption proposal forms.
- Category
- Business interruption/Supply chain
- Data type
- Enumeration
- Risk drivers
- Severity, Accumulation
- Underwriting impact
- Premium, Sublimit, Condition/Warranty
Typical proposal-form questions
- For each identified bottleneck unit, is a critical spare held on-site, pooled with sister facilities, contractually reserved with the manufacturer, or not covered at all?
- How was the decision on stocking versus not stocking each item justified, and when was it last reviewed?
- Where no spare is held, what is the confirmed manufacturer lead time for the component in question?
Evidence
- Spare parts inventory list mapped to critical units
- Framework or reservation agreements with manufacturers
- Risk engineering survey findings on spare parts coverage
Why it matters for underwriting
Once a bottleneck unit has been identified, the single factor that determines whether its failure produces a short repair or a months-long interruption is whether a critical spare is actually available. Underwriters use the stocking status – on-site, pooled, contractually reserved, or none – to translate an abstract bottleneck exposure into a concrete expected downtime figure, since the manufacturer lead time for an unstocked, custom-built component can run into many months or even years.
Capturing the attribute and evidence
Proposal forms and risk engineering surveys ask, for each identified bottleneck unit, which of the defined stocking categories applies: held on-site, available through a pool shared with sister facilities, reserved under a framework agreement with the manufacturer, or not covered at all. Underwriters corroborate the answer with the insured’s spare parts inventory mapped against the criticality analysis, any framework or reservation agreements, and, where available, the findings of an on-site risk engineering survey.
Effect on coverage, premium and conditions
Bottleneck units backed by an on-site spare or a contractually secured reservation support standard indemnity periods and pricing. Units with no coverage at all, particularly where the manufacturer lead time is long, typically trigger a recommendation to extend the indemnity period, a loading on the machinery breakdown and business interruption rates, or a condition requiring the insured to close the gap before full limits are confirmed.
Mitigation measures
Recommended measures include prioritising stocking or pooling arrangements for the units with the longest lead times and the highest production impact, negotiating priority delivery or repair agreements with manufacturers where physical stocking is not economical, and periodically reviewing the stocking decision as production configurations, manufacturer programmes and lead times evolve.