The highest-level inspection, condition-assessment, risk-review, and audit framework for the complete AGL system. Unlike Divisions 01–24, which inspect individual assets, systems, activities, records, or specific conditions, Division 25 asks the strategic question: what is the overall health, reliability, risk, compliance, and future maintenance requirement of the airport-wide AGL system? It functions as the management-level condition-assessment and audit layer sitting above every other division.
Final-division principle — Divisions 01–24 inspect the system; Division 25 interprets it. The first 24 divisions generate the inspection evidence — Division 25 converts that evidence into condition, risk, priority, maintenance strategy, replacement strategy, and management decision.
Comprehensive assessment of the overall AGL installation across the airport, covering asset-inventory verification, system-zone condition by runway/taxiway/apron/approach/control/support areas, operational availability, serviceability, defect density, condition distribution, critical-system dependency, and a consolidated airport-wide risk overview.
Overall condition assessment of runway lighting assets — edge, threshold, end, centreline, touchdown-zone, and guard lighting — together with fixture-deterioration, reliability, and photometric condition trends.
Overall taxiway lighting condition assessment covering edge and centreline lighting, clearance bars, exit lighting, holding-position lighting, rapid-exit taxiway lighting, fixture deterioration, and reliability history.
Overall approach-lighting condition assessment covering fixtures, structures, foundations, alignment, cabling, transformers, and environmental effects.
Overall airfield-sign condition assessment across mandatory, direction, location, and information signs, covering message correctness, illumination, structural condition, electrical condition, and water-ingress deterioration.
Overall PAPI/APAPI condition assessment covering housing, optics, alignment, elevation, foundation, electrical interfaces, calibration history, and photometric condition.
Overall assessment of CCR and series-circuit condition covering physical/operational condition, reliability, output performance, protection, cooling, control, and communication, plus series-circuit reliability and current-stability review.
Airport-wide assessment of isolating transformers covering physical and environmental condition, connectors, secondary leads, failure history, deterioration trend, and replacement priority.
Overall assessment of the AGL primary-cable network covering insulation condition and test history, joints, terminations, routes/trenches/ducts, water-ingress risk, failure history, and replacement priority.
Airport-wide assessment of AGL secondary connectors covering contact deterioration, corrosion, moisture ingress, overheating-related history, mechanical condition, and replacement priority.
Overall assessment of AGL earthing and bonding covering electrodes, pits, conductors, equipment/base-can/transformer bonding, CCR earthing, lightning/SPD arrangements, and earth-resistance trend.
Overall AGL control-system condition assessment covering workstations, HMI, PLC/interface equipment, network infrastructure, control cabinets, communication reliability, alarm/event history, remote-control reliability, and obsolescence/upgrade priority.
Airport-wide assessment of photometric condition covering runway, taxiway, approach-light, PAPI, and sign photometric data, deficiency trends, and calibration traceability.
Identification and ranking of assets whose failure has significant operational consequences, combining criticality classification, standardized condition scoring, failure-risk, redundancy, and obsolescence into a maintained critical-asset register.
Review of defect severity over time across critical, major, and minor categories, together with frequency, location, asset-type, cause, and closure-time trend analysis.
Identification of repeated defects and repeat-failure assets, reviewing recurring component, location, connector, cable, fixture, and CCR failures, and assessing whether previous corrective actions actually eliminated the recurring problem.
Assessment of whether current inspection frequencies are adequate — reviewing missed and late inspections, defect-finding yield by inspection type, and frequency versus failure occurrence, leading to risk-based frequency recommendations.
Assessment of asset suitability for condition-based maintenance — reviewing deterioration trends, failure probability, measurable condition indicators, predictive-monitoring opportunities, maintenance triggers, and priority ranking for transition from preventive to condition-based maintenance.
Assessment of assets approaching replacement requirement, reviewed by age, condition, failure history, obsolescence, spare-parts/manufacturer supportability, lifecycle cost, and operational-risk consequence, producing a ranked multi-year replacement plan.
Formal annual assessment consolidating every Division 25 output into a single airport-wide management report — condition, reliability, risk, maintenance strategy, and replacement priorities presented for executive and capital-planning decisions.
A standardized condition rating converts hundreds or thousands of Division 01–24 inspection observations into a single airport-wide management view. The numerical score should be applied according to a documented airport/project condition-rating methodology rather than used as an arbitrary universal standard.
ExcellentNew/very good condition; no significant deterioration.
GoodMinor deterioration; normal maintenance.
FairNoticeable deterioration; increased monitoring required.
PoorSignificant deterioration; corrective action/replacement planning required.
CriticalSevere condition; high failure/operational risk.
FailedUnserviceable/non-functional.
Condition alone should not determine replacement priority. This model prevents the airport from simply replacing the oldest-looking equipment instead of addressing the highest-risk equipment.
Condition = Poor
Criticality = High
Failure consequence = High
→ High replacement priority
Condition = Poor
Criticality = Low
Failure consequence = Low
→ Monitor / planned replacement
Division 25 should ultimately produce a management dashboard consolidating condition, compliance, and risk KPIs across the entire AGL system.
| KPI | Result |
|---|---|
| Total AGL Assets | — |
| Serviceable Assets | — |
| Defective Assets | — |
| Unserviceable Assets | — |
| Critical Assets | — |
| Open Critical Defects | — |
| Recurring Defects | — |
| Assets Condition Score 5 | — |
| Assets Condition Score 4 | — |
| Assets Condition Score 3 | — |
| Assets Condition Score 2 | — |
| Assets Condition Score 1 | — |
| High-Risk Assets | — |
| Replacement-Priority Assets | — |
| Overdue Inspections | — |
| Inspection Compliance | — |
| Test-Record Compliance | — |
| Calibration Compliance | — |
| Documentation Compliance | — |
| Photometry Compliance | — |
| Condition-Based-Maintenance Candidates | — |
What condition is the AGL system in?Current physical and technical condition.
What is failing most often?Failure and recurring-defect trends.
What is most critical?Operational criticality and risk.
What should we do next?Maintenance, monitoring, repair, rehabilitation, or replacement.
What happens if we do nothing?Future operational, reliability, safety, compliance, and lifecycle risk.
The Annual AGL Condition-Assessment Report should include:
The first 24 divisions generate the inspection evidence; Division 25 converts that evidence into CONDITION → RISK → PRIORITY → MAINTENANCE STRATEGY → REPLACEMENT STRATEGY → MANAGEMENT DECISION — making it the natural highest-level "AGL Health & Audit" division and the logical final division of the complete 25-Division AGL Inspection Framework.
Quick answers about airport-wide audit in the AGL Inspection Handbook.
Division 25 contains 20 published topics in 22 sections (A–V). It is the highest-level inspection, condition-assessment, risk-review and audit framework for the complete AGL system, asking about the overall health, reliability, risk, compliance and future maintenance requirement of the airport-wide system.
Divisions 01–24 inspect individual assets, systems, activities, records or conditions. Division 25 is the management-level layer above them: divisions 01–24 inspect the system, while Division 25 interprets it, converting the inspection evidence into condition, risk, priority, maintenance strategy, replacement strategy and management decision.
It must answer what condition the AGL system is in, what is failing most often, what is most critical, what to do next, and what happens if nothing is done.
A standardized rating from 5 (Excellent) down to 0 (Failed), with 4 Good, 3 Fair, 2 Poor and 1 Critical. It converts many inspection observations into a single management view, and should follow a documented airport or project condition-rating methodology rather than being used as an arbitrary universal standard.
Condition alone should not determine it. The asset priority model combines condition, criticality, failure risk and operational consequence, which prevents the airport from replacing the oldest-looking equipment instead of addressing the highest-risk equipment.
The minimum contents include an executive summary, the AGL asset inventory, overall and zone-level condition, critical-asset ranking, defect statistics and recurring-defect analysis, reliability trends, maintenance effectiveness, condition-based-maintenance opportunities, replacement priorities, compliance and documentation status, high-risk assets, and recommended corrective actions, capital replacements, maintenance strategy and next assessment priorities.
Yes. This handbook is an uncontrolled educational reference, not an approved procedure. The airport's approved inspection schedule, SMS procedures, ATC instructions, NOTAM procedures and local aerodrome regulations always take precedence, and the current revision of any official document should be verified before use.
Yes. Each inspection topic has a Download as Word option that produces an uncontrolled Word checklist template (description, a tick-box inspection table and an inspector sign-off block) for personal reference and internal training, to be reviewed and adopted under the user’s own document control.
Airport-wide AGL condition assessment and audit is where system-level, cross-division condition awareness begins. Go beyond identifying defects and build the technical knowledge to understand why abnormalities occur, how they affect system serviceability, and when further testing, troubleshooting, maintenance or corrective action is required.
Develop structured knowledge across:
Learn to connect the inspection process with the wider AGL engineering lifecycle.
Inspect with purpose. Understand the system. Act with technical confidence.
Please read before relying on any content on this page or on any record downloaded from it.