Airport Lighting Maintenance Schedule & AGL Maintenance Checklist
A typical AGL maintenance framework from daily checks to annual inspection, with runway, taxiway, approach, PAPI, CCR, transformer and cable maintenance, photometry, defect classification and records.
Why Airport Lighting Needs a Planned Maintenance Schedule
Airport lighting is safety-critical infrastructure. A runway, taxiway, approach system or PAPI can keep operating while it quietly degrades, so maintenance has to be a planned preventive programme, not a response to failures. ICAO Annex 14 requires aerodromes to establish maintenance programmes, including preventive maintenance where appropriate, so facilities stay in a condition that does not impair the safety, regularity or efficiency of air navigation.
The goal is the whole system
Preserve the correct pattern, intensity, colour, orientation, electrical performance, availability and reliability of the complete lighting system, not just keep lamps lit.
A practical schedule combines
Routine operational inspection, preventive maintenance, electrical testing, component inspection, photometric verification, corrective maintenance, post-maintenance testing, serviceability monitoring and documented trend analysis.
From requirement list to plan, safe work, verification and records.
AGL Visual Encyclopedia: Maintenance Requirement Flow Preventive Maintenance Sequence Serviceability of Critical Lights
Maintenance Schedule by Frequency
Pick a frequency to see typical activities. Adjust to the aerodrome: a CAT II/III runway, a busy taxiway system or an LED installation with condition monitoring may need more frequent or more specialized checks.
Typical activities
Worth knowing
Maintenance Frequency at a Glance
| Frequency | Typical maintenance activities |
|---|---|
| Daily / operational | Visual condition, lighting status, reported faults, obvious damage, serviceability, lens condition, signs and PAPI status |
| Weekly | Fittings, signs, visible damage, cleanliness, PAPI condition and alignment where specified, connectors and exposed equipment |
| Monthly | Electrical and physical inspection, internal cleaning where applicable, connections, brightness stages, CCR indications, equipment condition |
| Quarterly | Detailed component inspection, connectors, transformer housings, CCR checks, control equipment, selected electrical measurements |
| Periodic | Detailed system inspection, insulation and earthing checks, cable and circuit assessment, alignment and condition verification |
| Annual | Comprehensive inspection, electrical testing, photometric verification as applicable, documentation and plan review |
| As required | Fault rectification, photometry, PAPI calibration or alignment, cable fault location, corrective maintenance, post-repair testing and retesting |
Typical schedule by AGL system
| System | Daily | Weekly | Monthly / periodic | Annual / detailed |
|---|---|---|---|---|
| Runway edge | Status, visual | Physical condition | Connections, fixtures | Detailed inspection and performance verification |
| Runway centreline | Status, pattern | Fixture condition | Electrical, physical | Circuit and photometric checks as required |
| Taxiway lights | Status | Fixture and sign inspection | Electrical, physical | Detailed system assessment |
| Approach lights | Status, pattern | Structural and fixture | Physical, electrical | Photometry and alignment as applicable |
| PAPI | Operational status | Optical, physical | Angle and electrical checks as specified | Calibration and performance verification |
| CCR | Alarm, status | Visual | Brightness, current, control | Detailed electrical and functional testing |
| Isolating transformers | Operational symptoms | Visual | Physical, electrical | Detailed condition assessment |
| Cables and connectors | Fault indications | Visible condition | Connector and termination checks | Electrical testing, fault-location investigation |
| ALCMS / ILCMS | Alarm, status | Control check | Functional checks | Full control and monitoring verification |
| Photometry | As required | — | Trend-based | Scheduled or authority-defined |
| Earthing and surge protection | Fault indication | Visual | Inspection as specified | Detailed test and verification |
What gets checked at each interval.
AGL Visual Encyclopedia: Inspection Requirement Flow Inspection Decision Flow
Runway, Taxiway and Approach Lighting Maintenance
Runway lighting
Think in patterns, not fittings. Edge: output, colour, lens, alignment, mounting, frangibility, transformer. Centreline (inset): lens, cover, pavement interface, water ingress, continuity. Threshold, end and touchdown zone: colour, intensity, alignment, circuit continuity. The remaining serviceable lights must still preserve the intended pattern. ICAO guidance sets stricter serviceability objectives for CAT II/III systems and significant lighting elements.
Taxiway lighting
Keep guidance continuous and unambiguous: edge and centreline lights, inset and elevated fixtures, stop bars, guard lights, signs, connectors, transformers, foundations. Adjacent centreline failures can matter more than isolated ones, and ICAO-derived criteria include serviceability objectives for taxiway centreline lighting in low-RVR conditions. So classify defects by location and pattern, not just count.
Approach lighting
Maintain it as a geometric visual system: availability, intensity, colour, alignment, elevation, barrettes, crossbars, supports, frangible parts, cable and transformer connections, contamination and damage. Pay particular attention to the critical inner portions for high-category operations. ICAO material includes visual inspection plus in-field measurement of intensity, beam spread and orientation for precision approach lighting.
Taxiway Lighting Maintenance Checklist
A taxiway lighting maintenance checklist should keep guidance continuous and unambiguous, and defects should be classified by location and pattern, not just count. Adapt it to your approved programme and the frequencies in the AGL Maintenance Checklist further down this page.
- Taxiway edge and centreline lights operational, with no abnormal pattern or adjacent centreline failures
- Inset and elevated fixtures: lens condition, alignment, mounting, light base and water ingress
- Stop bars, guard lights and signs checked
- Connectors, isolating transformers, junction boxes and foundations inspected
- Defects classified, closed or escalated, and recorded for trend analysis
Related Guides
Runway lighting systems Taxiway lighting systems Approach lighting systems Runway guard lights and stop barsThe order of a visual inspection of installed lighting.
AGL Visual Encyclopedia: Visual Inspection Sequence Fixture Inspection Fixture Cleaning
PAPI, CCR, Transformers, Cables and Connectors
PAPI
Beyond checking lamps are lit: optical (lenses, contamination, water ingress, deterioration), physical (housing, foundation, mounting, corrosion, fasteners), alignment (vertical angle, horizontal alignment, unit-to-unit relationship, elevation, relation to threshold and approved geometry), electrical (transformer, cables, connectors, supply, brightness operation, controls) and performance (white/red transition, beam, intensity, consistency, photometry). Consider calibration after significant maintenance, physical disturbance or changes that affect geometry. The AAI example includes PAPI angle checks with clinometers.
Constant current regulator
Inspect enclosure, ventilation, cooling, terminals, supply, output circuit, current indication, control interface, brightness stages, alarms, protection, switching devices, power electronics, communication modules, local and remote operation and status feedback. Where applicable verify output current and stability, each step, alarm response, remote command, circuit indication, changeover and fault reporting, against the CCR design, manufacturer documentation and airport specification, not one generic tolerance.
Isolating transformers
Check condition, primary and secondary connectors, leads, housing, moisture, corrosion, overheating, insulation condition, damage and connection security, plus the surrounding enclosure and drainage in housings and bases.
Airport Lighting Cable Connector & Cable Maintenance
Surface lamp failures can hide insulation breakdown, water ingress, damaged cable, connector failure, poor joints, transformer failure, earth leakage or discontinuity. Review cable identification and route records, joints, connectors, entry points, water ingress, insulation resistance, continuity, earth faults and fault-location results. Repeated failures at one location are a system-level defect, not repeated lamp replacement.
Related Guides
PAPI alignment and maintenance PAPI maintenance checklist PAPI calibration, aiming and alignment CCR working principle Airport isolating transformer Cables and connectors AGL componentsPlanned work before failure, step by step.
AGL Visual Encyclopedia: Preventive Maintenance Sequence CCR Maintenance Transformer Maintenance
Photometry, Control Systems, Surge Protection and LED
Photometric verification
A light can be electrically operational and no longer give the required optical performance. Photometry evaluates intensity, beam spread, colour, orientation, horizontal and vertical distribution, coverage, PAPI beam characteristics and brightness-stage performance. Trigger it at scheduled intervals, after major maintenance, rehabilitation, replacement or alignment work, after repeated failures, at commissioning and acceptance, when trends show degradation or when the authority requires it. A recent AAI tender covers runway, threshold, approach and PAPI/inset fittings with reports and corrective measures; that is project-specific, not a universal annual rule.
Control and monitoring (ALCMS/ILCMS)
Test both paths. Command: operator selects the circuit, the system sends the command, the CCR changes output. Feedback: the CCR changes state, the field status is detected, and the control system shows the correct status or alarm. Check local and remote control, circuit and CCR status, brightness command, alarm generation and acknowledgement, communication, event logs, loss-of-communication alarms and redundant paths. A wrong status indication can matter even when the lights work.
Lightning and surge protection
Inspect surge-protection devices, earthing and grounding, bonding, cabinets, CCR and control-system protection, cable-entry protection and visible damage. After a significant lightning event an unscheduled inspection may be appropriate even if the system seems fine.
LED AGL
LED cuts some lamp work but not maintenance. ICAO APAC working material highlights vibration, moisture and temperature issues. Inspect optical output, lens, housing, thermal condition, connectors, power supply, electronics, control interface, surge protection, moisture and alignment. An LED fitting that is "on" may still have degraded output.
Related Guides
AGL photometric testing procedure AGL photometry ALCMS Surge protection and lightning mitigation LED AGLHow a photometric test of an installed light is carried out.
AGL Visual Encyclopedia: Photometric Testing Process Photometric Inspection Photometric Testing Arrangement
Event-Driven Maintenance
A preventive programme should not run on calendar intervals alone. Trigger unscheduled inspection after lightning, heavy rainfall, flooding, severe storm, high winds, aircraft or vehicle excursion, construction, runway rehabilitation, pavement work, accidental damage, electrical incidents or unexplained alarms. A minor impact to an elevated light can change its orientation enough to affect photometric performance while it keeps working.
Consider immediate or priority maintenance for
From serviceability measurement to a maintenance action.
AGL Visual Encyclopedia: Serviceability-Triggered Maintenance Flow Minimum Serviceable Lamp Percentages by Light Type Closed Taxiway and Unserviceability Lighting
Defect Classification and Response
| Class | Typical meaning | Typical response |
|---|---|---|
| Critical | May immediately compromise required guidance or system availability | Immediate notification, operational assessment, urgent rectification |
| Major | Significant degradation of part of an important lighting system | Priority corrective maintenance |
| Minor | Localized defect with limited immediate operational effect | Planned corrective maintenance |
| Observation | Needs monitoring but not immediate repair | Record and trend |
Critical examples
Major runway circuit failure, loss of critical centreline guidance, PAPI not giving its guidance, serious CCR failure on an operational runway, widespread failure of a critical section, control failure where lighting cannot be reliably controlled or monitored.
Major examples
Multiple failed lights, repeated adjacent failures, significant brightness degradation, damaged transformer connection, water ingress affecting several fittings, damaged stop-bar section, significant PAPI alignment discrepancy.
Minor examples
Damaged hardware not affecting alignment, minor corrosion, localized lens contamination, non-critical sign damage, minor enclosure defects.
Defect response process
Record
- Date, time, airport, runway or taxiway, location
- Equipment ID and defect description
- Photographs where useful
- Operational status
Assess, then verify
- Does it affect guidance, a critical pattern, redundancy or electrical safety?
- Does it need operational coordination, NOTAM or other notification under airport procedures?
- After repair: light operates, circuit stable, pattern restored, control status correct, brightness and alignment correct, photometry met where applicable
From a reported defect to a verified repair.
AGL Visual Encyclopedia: Corrective Maintenance Sequence Post-Maintenance Restoration Safe Maintenance Sequence
Maintenance Records and Trend Analysis
A good record holds
- Asset: airport, runway or taxiway, system, circuit, equipment ID, fixture type, transformer ID, CCR number, location
- Inspection: date, time, technician, conditions, type, test equipment
- Defect: description, classification, operational impact, temporary and permanent action
- Test: current, insulation and earth measurements, photometric and PAPI data, control test, calibration status
- Closure: component replaced, repair, retest, supervisor verification, date
Registers to maintain
- Asset and maintenance registers
- Testing and photometry registers
- PAPI and CCR registers
- Defect register (defect, class, impact, repair date, retest, closure)
Reading the trends
| Trend | Possible indication |
|---|---|
| Repeated lamp failures at one location | Fixture, transformer, connection or circuit problem |
| Repeated transformer failures | Moisture, thermal or electrical stress |
| Increasing cable faults | Cable deterioration or water ingress |
| Frequent CCR alarms | CCR or circuit abnormality |
| Repeated PAPI realignment | Foundation, mounting or environmental issue |
| Increasing photometric failures | Optical degradation or fixture ageing |
| Repeated connector failures | Sealing, installation or environmental problem |
| Repeated water ingress | Drainage, gasket or housing issue |
Why a trend over time says more than one reading.
AGL Visual Encyclopedia: Insulation-Resistance Trend Analysis Over Time Insulation-Resistance Testing As-Built Records and Circuit Schedules
Preventive, Corrective and Condition-Based Maintenance
Preventive
Planned work before failure: cleaning, scheduled inspection, tightening, electrical testing, alignment checks, photometry, connector, transformer and CCR checks.
Corrective
Work after a defect: replacing failed fittings, transformers or connectors, cable repair, PAPI realignment, CCR repair, sign replacement, repair after impact.
Two airports with the same AGL equipment can need very different programmes because of aircraft movements, climate, rainfall, humidity, dust, salt, pavement condition, flooding, lightning exposure, installation age, LED technology, runway category, operating hours, RVR conditions and fault history. The best programmes combine time-based, condition-based and event-driven maintenance: annual photometry, find degradation, raise inspection frequency, clean, repair or replace, retest, trend.
Seven layers a programme must protect
Time, condition and events all trigger work, and all feed one loop.
AGL Visual Encyclopedia: Predictive Maintenance Preventive Maintenance Sequence Corrective Maintenance Sequence
AGL Maintenance Checklist
Click an item to mark it complete. Use as a sample and adapt to your approved programme.
Daily
Weekly
Monthly
Quarterly
Annual / periodic
Airport Lighting Inspection Checklist
The checklist above sets out the inspection items by frequency, from the daily operational check to the annual or periodic inspection. Adapt it to the aerodrome's approved programme and record the result of each inspection, including any defect and its closure.
Airport Lighting Day Inspection
A day inspection is the physical check: damaged or displaced fittings, cracked or contaminated lenses, water ingress, exposed wiring, damaged bases or covers, corrosion, mounting and foreign material around the fittings, plus the condition of signs and PAPI units.
Airport Lighting Night Inspection
A night inspection checks the lighting while it is lit. Failed or intermittent lights, abnormal brightness or colour, an abnormal lighting pattern and the PAPI indications are easier to see at night, so it complements the day inspection rather than replacing it.
Maintenance in India and Contractor Scope
For Indian airports, align the programme with applicable DGCA requirements, AAI requirements where they apply, current AIP/eAIP information, approved airport procedures, equipment manuals and project specifications. A current AAI eAIP entry assigns the Electrical In-charge responsibility for Category I precision-approach lighting serviceability and states the associated runway-lighting serviceability objective. AAI maintenance documents show practical schedules mixing daily cleaning and serviceability checks, periodic PAPI angle checks, brightness-stage checks, CCR operation, wiring and termination inspection and earthing records. Do not copy a generic monthly or annual checklist: build the programme from the actual configuration and requirements.
Runway Lighting Standards India
For runway lighting in India, the applicable requirements come from DGCA requirements, AAI requirements where they apply, current AIP/eAIP information, approved airport procedures, equipment manuals and the project specification. There is no single generic standard set for every runway, so identify the requirements from the airport's own documents. See the Standards Companion for how the references fit together.
Airport Lighting Test Standards
The standard used for a test depends on what is being tested. Electrical tests follow the equipment manufacturer's documentation and the project specification, and photometric tests follow the requirement the aerodrome or authority defines. Do not use one generic tolerance, and record the test equipment and its calibration status with the result.
A contractor scope should define
- Inspection frequency and working hours
- Airside access, safety and permit requirements
- Equipment to inspect, test instruments and calibration
- Spare parts and emergency response
- Defect response time
- Documentation and reporting
- Photometric testing and PAPI calibration
- CCR maintenance and transformer inspection
- Cable fault location and post-maintenance testing
- Final acceptance, and what counts as routine, preventive, corrective, specialized testing or major rehabilitation
Maintenance Services by Precision AGL Solutions
One coordinated process, from inspection to trend analysis, subject to the airport’s scope, approved procedures and applicable authority requirements.
Quick Knowledge Check
Q1. What should set the final maintenance frequency?
Q2. A control system should be tested for which paths?
Q3. A defect keeps recurring at one location. What is the right view?
Q4. When can a defect be closed?
Q5. Which classification suits a localized lens contamination with limited operational effect?
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Light bases and housings.
Open Junction Boxes & Transformer Housings →PAPI Alignment & Maintenance
PAPI alignment and field practice.
Open PAPI Alignment & Maintenance →PAPI Maintenance Checklist
Inspection, testing and troubleshooting.
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Angle, alignment and unit geometry.
Open PAPI Calibration, Aiming & Alignment →Testing & Commissioning Guide
Test and commission AGL systems.
Open Testing & Commissioning Guide →Lightning & Surge Protection
Counterpoise, bonding and SPDs.
Open Lightning & Surge Protection →ICAO Aerodrome Lighting Requirements
The ICAO AGL framework.
Open ICAO Aerodrome Lighting Requirements →Maintain the Whole Chain.
From daily checks to trend analysis, explore the complete AGL knowledge base.
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Runway, Taxiway & Approach Lighting
Surface Movement & Safety
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Airport Lighting Maintenance FAQ
Q1How often should airport lighting be maintained?
There is no single universal calendar. Base AGL maintenance on the aerodrome's approved preventive-maintenance programme, operating category, equipment type, manufacturer requirements and authority requirements. A practical programme combines daily or operational checks with weekly, monthly, periodic and annual inspections.
Q2Is airport lighting inspected every day?
Operational inspections are commonly daily or per shift, but the exact requirement depends on the approved aerodrome procedures. Daily checks focus on serviceability, visible damage, reported faults and operational condition.
Q3How often should PAPI be checked?
According to the approved maintenance programme. Routine checks can cover optical cleanliness, physical condition, electrical operation and alignment. Some AAI maintenance schedules specify more frequent PAPI angle checks than a simple monthly inspection, so project-specific requirements can be more demanding than a generic schedule.
Q4How often should airport lighting photometry be performed?
There is no single interval for every installation. Photometry may be scheduled periodically and also triggered by commissioning, rehabilitation, alignment changes, fixture replacement, repeated defects or performance concerns. The airport specification and maintenance programme decide the interval.
Q5What is preventive maintenance in airport lighting?
Planned work done to reduce the probability of failure or degradation: inspection, cleaning, testing, alignment, electrical checks, photometry, component inspection and similar activities.
Q6What is corrective maintenance in AGL?
Work done after a defect is identified, such as replacing failed fittings, repairing cables, replacing isolating transformers, repairing CCRs and realigning PAPI.
Q7Why is AGL cable maintenance important?
AGL is an electrical distribution system, not independent lamps. Cable, connector and transformer problems can cause repeated light failures and circuit instability, so the programme should include the associated cable systems. FAA preventive-maintenance guidance includes cable systems.
Q8Should LED airport lighting still be maintained?
Yes. LED reduces lamp replacement but still needs inspection of optical output, electronics, thermal condition, connectors, housing, surge protection, moisture ingress and alignment.
Q9What should happen after an AGL repair?
Test the repaired equipment before closing the defect. Depending on the repair, that may be electrical testing, operational testing, control-system verification, alignment checks or photometric verification.
Q10What is the difference between AGL maintenance and AGL testing?
Maintenance restores or preserves equipment condition. Testing measures and verifies performance. A good programme uses both.
Q11Why are maintenance records important?
They show what was inspected and tested, evidence defect closure, support audits and enable trend analysis that can expose recurring problems before they become major failures.
Engineering & Expert Notes
Adapt Frequencies to Your Own Experience
PlanningGeneric schedules are a starting point. Adjust intervals using failure history, traffic and environment.
Night Inspections Reveal What Day Checks Miss
InspectionDimmed or misaligned lights and colour issues are more obvious in darkness. Include night checks in the schedule.
Classify Defects for Consistent Response
DefectsDefine response times for categories of defect so crews and managers share expectations.
Use Records to Spot Trends
TrendsRepeated failures in one area point to a systemic cause. Review logs regularly and act on patterns.
Schedule Electrical and Photometric Checks, Not Only Visual Ones
CoverageA visual walk does not show insulation decline or optical drift. Plan instrument-based checks too.
Close the Work Order Fully
RecordsRecord what was found and done so that the next visit starts from facts.
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