The spares-management and asset-lifecycle control layer of the handbook. It connects maintenance with the practical questions of what spare is required, how much should be stocked, whether it is available, how it is stored, and when the asset itself should be repaired, replaced or retired.
The key question: is the required spare available, identifiable, serviceable and traceable — and is the asset it supports still worth maintaining?
Distinction: Divisions 01–05 decide what maintenance to perform. Division 22 decides whether the parts exist to perform it, and tracks the asset across its full life — from installation to retirement and disposal — using the maintenance and failure history captured in Division 21.
Every asset moves along the same continuous path — maintenance consumes spares, spares get replenished, and the accumulated life and failure history eventually drives a replacement or retirement decision.
Principle: the required spare shall be available, identifiable, serviceable and traceable when the AGL asset requires maintenance.
A simple controlled inventory status keeps unserviceable parts out of the usable-spares pool.
| Status | Meaning |
|---|---|
| Serviceable | Available for issue |
| Reserved | Allocated to a specific requirement |
| Inspection Required | Awaiting technical inspection |
| Damaged | Not available for service |
| Rejected | Not approved for use |
| Obsolete | No longer approved / supported |
| Expired | Shelf-life requirement exceeded, where applicable |
Rule: damaged, rejected, obsolete or expired parts must be clearly segregated from serviceable inventory to prevent accidental issue of a defective spare.
Grouped by function — click any topic to expand what it covers.
Rule: the minimum level should be documented rather than left to individual judgement, and replenishment initiated once stock falls below it.
Review: maximum stock should be periodically reviewed against actual consumption.
Rule: avoid storing unidentified components in the usable-spares inventory.
Layout: parts should be organized so that identification and retrieval are straightforward.
Priority: particularly important for parts or materials whose condition may deteriorate during storage.
Purpose: prevents accidental issue of defective parts.
Use: this information supports future stock-level decisions.
Link: connects directly with the Division 05 emergency maintenance response.
Reminder: age is tracked from the applicable installation / commissioning reference.
Scope: tracked where the equipment provides meaningful operating-hour information.
Trigger: increasing failure frequency can become a trigger for detailed lifecycle assessment.
Use: where actual replacement history is available, use it to establish the component's observed service life.
Link: this should connect directly with Division 21 records.
Risk: obsolescence can become a lifecycle risk even when the equipment is still functioning.
Note: final classification should follow the airport's approved asset-management criteria.
Purpose: preserves the asset's lifecycle history even after disposal.
Sizing: exact stock quantity should be established from the asset population, failure history and supplier lead times.
Note: critical CCR spares should be established according to the installed manufacturer / model and airport requirements.
Note: requirements should consider circuit configuration and installed ratings.
Rule: avoid mixing visually similar but technically different connector types.
Note: maintain critical control-system spares according to the installed architecture.
Note: control-system spares should be matched to the installed system architecture and configuration.
How an asset's replacement priority is set once condition, age and support risk are combined.
High operational / safety consequence combined with poor reliability or support.
Increasing failures, deterioration, or difficult spare availability.
Aging asset requiring a planned, budgeted replacement.
Serviceable asset with no immediate replacement requirement.
Note: the actual classification should follow the airport's approved asset-management criteria — these bands are a proposed management framework.
Combinations that should trigger an engineering review of the asset.
| Indicator Combination | Triggers |
|---|---|
| High age + increasing failures | Replacement assessment |
| High repair frequency + high maintenance cost | Lifecycle review |
| Obsolete equipment + poor spare availability | Planned replacement |
| Critical asset + long supplier lead time | Increase critical spare strategy |
| Repeated component failure | Failure / root-cause investigation |
| End-of-life asset + limited manufacturer support | Priority lifecycle planning |
The twelve-step sequence that carries a spare from a maintenance defect through to an updated inventory record.
A defect requiring a spare is identified.
Confirm the specific part needed.
Verify availability and status.
Release the part for the work order.
Log date, asset, quantity, technician.
Reduce recorded quantity available.
Compare remaining stock to the minimum.
Initiate procurement below minimum.
Accept the incoming shipment.
Verify condition and specification.
Place in the controlled storage location.
Close the loop on the stock record.
Quick answers about spare parts & asset lifecycle maintenance, based on the topics in this division.
It is the spares-management and asset-lifecycle control layer of the handbook. It connects maintenance with practical questions: what spare is required, how much should be stocked, whether it is available, how it is stored, and when an asset should be replaced or retired.
Division 22 (Spare Parts & Asset Lifecycle Maintenance) contains 34 topics in three groups: Group A Spare Parts Management (12 topics), Group B Equipment Lifecycle (12 topics) and Group C Critical AGL Spares (10 topics).
Divisions 01 to 05 decide what maintenance to perform. Division 22 decides whether the parts exist to perform it, and tracks the asset across its full life from installation to retirement and disposal using the maintenance and failure records.
The required spare shall be available, identifiable, serviceable and traceable when the AGL asset requires maintenance.
Serviceable (available for issue), Reserved (allocated to a specific requirement), Inspection Required, Damaged, Rejected, Obsolete, and Expired where a shelf-life requirement applies. Damaged, rejected, obsolete or expired parts must be clearly segregated from serviceable inventory to prevent accidental issue of a defective spare.
Twelve steps: maintenance defect, spare required, check inventory, issue spare, record consumption, update stock, check the minimum level, reorder if required, receive, inspect, store, and update inventory.
Priority 1 Critical is high operational or safety consequence combined with poor reliability or support; Priority 2 High is increasing failures, deterioration or difficult spare availability; Priority 3 Planned is an aging asset needing a budgeted replacement; and Priority 4 Monitor is a serviceable asset with no immediate replacement requirement. These bands are a proposed management framework, and actual classification should follow the airport's approved asset-management criteria.
High age with increasing failures triggers a replacement assessment; high repair frequency with high maintenance cost triggers a lifecycle review; obsolete equipment with poor spare availability triggers planned replacement; a critical asset with a long supplier lead time means increasing the critical-spare strategy; repeated component failure triggers a failure or root-cause investigation; and an end-of-life asset with limited manufacturer support triggers priority lifecycle planning.
Spare parts and asset lifecycle maintenance is more than keeping a shelf stocked.
Build the technical knowledge to understand obsolescence risk, criticality-based stocking, asset condition tracking, and how lifecycle planning keeps the airfield resilient over decades.
Stock with purpose. Plan the lifecycle. Protect availability.
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