What this is
What counts as a critical spare?
What counts as a critical spare?
A critical spare is a part whose absence would stop a critical asset for longer than the business can absorb, not simply an expensive or fast-moving part. The review defines criticality by the asset first, using an existing criticality rating, and only then asks whether the component behind it is stocked. A cheap seal for a critical pump can outrank an expensive motor for a standard one.
Why review coverage instead of just holding more stock?
Holding stock against every possible failure is not affordable and is not the goal; the review exists to match holding decisions to actual consequence and lead time. A component with a two-day lead time and low downtime cost may be deliberately left unstocked, while a twelve-week lead item on a critical line gets held even if it rarely fails. Coverage percent only means something once that judgement has been applied.
How does this differ from a stock check?
A stock check confirms what is physically on the shelf against system records; this review asks a different question, which is whether the right things are on the shelf at all. It works from the asset criticality assessment and FMEA or RCM outputs downward to the parts list, rather than counting bins upward.
Scope
When is a critical spares review required?
This review is one step in the Planned Maintenance programme, and it only works if the registers it draws from are current. Using it to manage day-to-day stock movements produces records nobody can act on.
Use this template when
- The annual (or triggered) review of spares coverage against asset criticality is due
- A new record is needed; each one gets its own ID in the form CSPARE-2026-000
- A criticality rating or FMEA/RCM output has changed and coverage needs re-checking
- An obsolescence risk has been flagged and a stocking decision must be recorded
- A linked record needs this one to exist: links Asset, Parts
Do not use it for
- Spare Parts Register, which lists spare parts held, with location, minimum level and the assets they fit, and is the register this review checks against, not a substitute for it.
- Stock Count Record, which records a physical count of spare parts against system records, a quantity check rather than a coverage judgement.
- Asset Criticality Assessment, which sets the criticality rating this review consumes rather than re-derives.
- Obsolescence Review, where a broader end-of-life sweep across the parts catalogue is needed rather than a per-asset spares check.
- Anything outside KnowMaintain, which belongs in the workspace that owns that process
Compliance mapping
Which ISO 55001 cl.8.1 requirements does this satisfy?
ISO 55001 cl.8.1 requires operational planning and control that addresses risks and opportunities to asset objectives; this review is where that requirement becomes a documented, per-asset stocking decision.
| Clause | Requirement | Where it lands |
|---|---|---|
| 8.1 operational planning | Establish criteria and controls for processes affecting critical asset performance | Coverage by critical asset |
| 8.1 operational planning | Base controls on risk, not on convenience or habit | Coverage by critical asset |
| 6.1 actions to address risks and opportunities | Identify risks to achieving asset management objectives | Coverage by critical asset |
| 8.1 operational planning | Retain documented information for confidence that processes are carried out as planned | Header |
| 9.1 monitoring, measurement, analysis and evaluation | Determine what needs monitoring and how results feed decisions | Result |
| 10.1 nonconformity and corrective action | Act on identified gaps with a tracked corrective action | Result |
What it does not cover
- Critical Components Identified, which recorded 'No' or 'Partly' for an asset marked Critical, leaving the review's central question unanswered for that row.
- From FMEA Or RCM, which showed 'No' for a critical asset, meaning the components list was never derived from a structured failure analysis.
- Spares Held For All Critical Components, which recorded 'No' with no entry against Gaps Identified, so the shortfall cannot be actioned.
- Obsolescence Risk Identified, which was marked 'Yes' with Obsolescence Plan Required left as 'No', an internal contradiction the sign-off should catch.
- Action Required, which was marked 'Yes' with no CAPA ID entered, breaking the link to the corrective action it depends on.
Global
Critical Spares Review requirements by country
ISO 55001 is a voluntary, internationally recognised framework rather than a jurisdiction-specific regulation, so its consequence differs by what a site's customers or insurers expect of it.
ISO 55001
Certification is frequently a customer or tender requirement in food, pharma and process manufacturing supply chains.
A gap in critical spares coverage found at audit can put certification, and by extension a supply contract, at risk.
ISO 55001 alongside sector duty of care
Asset-intensive regulated sectors (utilities, rail) treat asset management maturity as part of licence conditions.
Spares coverage evidence supports demonstrating that foreseeable failure modes were planned for, not just reacted to.
ISO 55001 as a maturity signal
Business interruption insurers increasingly ask about spares strategy for critical equipment during underwriting.
A documented, criticality-driven review is evidence of active risk management, which affects premium and claims conversations.
How to complete it
How to complete a critical spares review, step by step
Filling in the fields is mechanical; the review only has value if these four calls are made deliberately and can be defended afterwards.
The Asset Criticality field on this form should trace back to the Asset Criticality Assessment, not be re-judged by whoever is filling in the spares review. If the two disagree, that disagreement is itself a finding, not something to quietly resolve on the spot.
A component list built from operator memory will systematically miss low-frequency, high-consequence failure modes, which are exactly the ones a spares review exists to catch. Where From FMEA Or RCM is 'Experience based', the coverage percent for that asset should be read with more scepticism, not treated as equivalent.
Worst Case Downtime and Cost Of That Downtime exist to be weighed against Cost Of Holding The Spare and Longest Lead Time Item Weeks. A decision to not stock a long-lead item should show that comparison was actually made, not just that the cost of holding looked high in isolation.
A part can pass every coverage test and still be a live risk if it is nearing end of manufacture; Obsolescence Risk Identified and Obsolescence Plan Required are deliberately separate from Coverage Percent so a fully-stocked-but-obsolete part cannot hide inside a good headline score.
What auditors find
Most common critical spares review findings
These are the patterns that recur across critical spares reviews once the form is actually interrogated rather than skimmed.
| Finding | Clause | What fixes it |
|---|---|---|
| Coverage percent is high but driven by low-criticality assets | 8.1 operational planning | Recalculate Coverage Percent restricted to rows where Asset Criticality is 'Critical' only, and report that figure separately from the blended one. |
| Gaps Identified is blank on rows scored 'Partly' or 'No' | 10.1 nonconformity and corrective action | Make Gaps Identified mandatory whenever Spares Held For All Critical Components is not 'Yes', so the gap has a description before the record can close. |
| Supplier Agreement In Place is left blank rather than 'No' | 8.1 operational planning | Force a Yes/No answer wherever Decision selects 'supplier holds', since a blank field here means the mitigation was never actually confirmed. |
| Longest Lead Time captured but never compared to downtime tolerance | 6.1 actions to address risks and opportunities | Add a review step that flags any row where lead time in weeks exceeds the site's stated acceptable downtime, regardless of the Decision recorded. |
| Obsolescence flagged with no owner or date for the plan | 10.1 nonconformity and corrective action | Route Obsolescence Plan Required 'Yes' straight into an Action Required trigger rather than leaving it as a standalone flag. |
| Second signature added without evidence the first reviewer's gaps were addressed | 9.1 monitoring, measurement, analysis and evaluation | Block the Maintenance Manager sign-off field until every row with an open gap carries a Decision other than blank. |
Case in point
Case in point: the spare that was never the problem, until it was
A packing line's critical spares review had run for three cycles with coverage sitting comfortably above ninety percent. The gearbox on the main conveyor had never failed in company memory, so it had never made it onto anyone's parts list, and because the review's component list was built from experience rather than an FMEA, its absence never showed up as a gap.
When the gearbox finally seized, the replacement had a nine-week lead time from a single overseas supplier. The line ran at half capacity on a manual workaround for the whole period. The next review cycle added a 'From FMEA Or RCM' check specifically because an experience-based list had quietly let a genuinely critical component sit outside the review's field of view for years.
The template
The template, field by field
The form exactly as it installs. Every field, option, score and conditional rule is editable, and the links to other templates come with it.
3 sections
- Reference
- MNT-066
- Archetype
- Review
- Record ID
- CSPARE-2026-000
- Scoring
- Coverage percent
- Direction
- High is good
- Singleton
- No
- Basis
- ISO 55001 cl.8.1
- Links
- Links Asset, Parts
- Tags
- Parts, Reliability
- Sections
- 3
- Fields
- 40
- Follow up fields
- 3
- Repeating sections
- 1
- Links out
- 3
Header
11 fieldsReview ID*
Auto sequence. Format CSPARE-2026-000.
The record's own ID. Other templates point at this value.
Status*
Drives who this goes to next.
- Planned2 pts
- In progress2 pts
- Complete3 pts
- Deferred0 pts
- Open0 pts
- Closed3 pts
- Overdue0 pts
Date and Time*
Raised By*
Site*
Site ID*
Format SITE-000.
Links to FDN-001 Site ID
Area
The area within the site.
Exact Location
Drop a pin for anything hard to find.
Period Reviewed*
Reviewed By*
Assets In Scope*
Coverage by critical asset
Repeats13 fieldsAsset*
Asset ID*
Format AST-0000.
Links to FDN-002 Asset ID
Asset Criticality*
Critical Components Identified*
- Yes3 pts
- Partly1 pt
- No0 pts
From FMEA Or RCM*
- Yes3 pts
- Experience based1 pt
- No0 pts
Spares Held For All Critical Components*
- Yes3 pts
- Partly1 pt
- No0 pts
Gaps Identified
Longest Lead Time Item Weeks
Worst Case Downtime If Unavailable
Cost Of That Downtime
Cost Of Holding The Spare
Decision*
Hold on site, supplier holds, share with another site, accept the risk.
Supplier Agreement In Place
- Yes3 pts
- No0 pts
Result
16 fieldsCritical Assets Fully Covered*
Critical Assets With Gaps*
Coverage Percent*
Parts Recommended For Addition*
Parts Recommended For Removal*
Net Stock Value Change
Obsolescence Risk Identified*
Parts no longer manufactured for assets still in service need a plan before the last one is used.
- No3 pts
- Yes0 pts
Obsolescence Plan Required*
- No3 pts
- Yes1 pt
Action Required*
Raise the action record, then enter its reference here.
- No2 pts
- Yes0 pts
Priority
- High0 pts
- Medium1 pt
- Low3 pts
CAPA ID
Format CAPA-2026-00000.
Links to FDN-014 CAPA ID
Action Owner
Planner*
Signature*
Maintenance Manager*
Second Signature*
MNT-066 · record IDs look like CSPARE-2026-000 · Links Asset, Parts
Open in KnowellaRun it with agents
From a document you fill in to a programme that runs itself
The form is the easy part. Keeping registers current, chasing lead times and holding evidence together across cycles is the work that actually slips.
Holds the critical spares review against the asset register and spare parts register, routes gaps to their owner, and keeps the coverage trend visible across cycles.
Feeds the FMEA and RCM outputs this review depends on, so a component list built from real failure analysis stays current rather than freezing at the last workshop.
Tracks supplier lead times and obsolescence signals against the parts catalogue, surfacing them before they turn into a review-cycle surprise.
Coordinates the crew, rolls coverage and exceptions into one view, and holds every write for your approval before it touches a record.
This template lives in KnowMaintain — asset maintenance. Work orders, planned maintenance, calibration, reliability and shutdowns.
Meet KnowMaintain→Glossary
Critical Spares Review definitions and key terms
- Criticality rating
- A classification of how much an asset's failure would cost in safety, production or compliance terms, used to decide where spares effort goes first.
- FMEA
- Failure Mode and Effects Analysis, a structured method for identifying how a component can fail and what the consequence of that failure would be.
- RCM
- Reliability Centred Maintenance, a methodology for choosing maintenance strategy based on failure consequence rather than a fixed calendar interval.
- Lead time
- The time between ordering a replacement part and having it available on site, which sets how long a failure without a spare will cost in downtime.
- Obsolescence
- The state where a part is no longer manufactured or supported, meaning the last unit in stock is the last one that will ever be available through normal channels.
FAQ
Frequently asked questions about critical spares review
What is a critical spares review?+
A critical spares review is a periodic check that the spares held on site match the assets whose failure would matter most, driven by criticality and lead time rather than by what has broken before. It is built against ISO 55001 cl.8.1 and forms part of the Planned Maintenance programme.
How often should it run?+
Yearly as a baseline, plus after any trigger event such as a criticality rating change, a new asset commissioning, or a near-miss caused by a missing spare.
Who normally completes it?+
The planner, working with reliability engineering, since the review needs both stock knowledge and an understanding of failure modes and criticality.
What if the critical component list was never built from FMEA?+
The review still runs, but the From FMEA Or RCM field should honestly record 'Experience based', which flags that the coverage figure for that asset is less reliable than it looks.
Does a high coverage percent mean the site is in good shape?+
Only if it is calculated against critical assets specifically, and if obsolescence risk has been checked separately. A blended coverage figure across all criticality levels can hide serious gaps on the assets that matter most.
Can the template be changed?+
Yes. Every field, option, score and conditional rule is editable, and the links to other templates come with it. Most teams install it as it is, run it for a cycle, then adjust.
Keep going
Related templates and programmes
Industries this is written for
Programmes this belongs to
Used together in Planned Maintenance
Asset Register
Holds every piece of equipment, machine, vehicle and tool you track
Tool and Equipment Register
Holds portable tools, gauges, lifting accessories and small equipment that sit below asset level but still need control
Maintenance Request
Asks maintenance to look at a problem or carry out a job
Work Order
The main record for a planned maintenance job, covering what, where, who and when
Corrective Work Order
Covers a repair to fix something that has already failed or degraded
Emergency Work Order
Covers urgent work where equipment has stopped or become unsafe
Written and reviewed by
Siddarth Singh
Founder & Chief Executive Officer, Knowella
Certified Safety Professional and industrial and systems engineer with more than a decade inside food supply chain, freight and manufacturing operations. This page was written against the current text of the standards it cites, not against secondary summaries of them.
- Certified Safety Professional (CSP), Board of Certified Safety Professionals
- MBA, University of Chicago Booth School of Business
- MS and BS, The Ohio State University, Industrial and Systems Engineering
- Six Sigma Black Belt
Sources and last review. Reviewed 16 August 2026 against:
- ISO 55001:2014 cl.8.1 — Operational planning and control
- ISO 55001:2014 cl.6.1 — Actions to address risks and opportunities
- ISO 55001:2014 cl.9.1 — Monitoring, measurement, analysis and evaluation
- ISO 55001:2014 cl.10.1 — Nonconformity and corrective action
This page is general guidance, not legal advice. Confirm requirements with your jurisdiction’s regulator.