ICAO Aerodrome Lighting Requirements AGL Standards & Visual Aids
How the ICAO framework covers runway, taxiway and approach lighting, PAPI, stop bars, runway guard lights, colour, photometry and maintenance, and how to tell an ICAO requirement from guidance, national rules, FAA values and airport specifications.
ICAO Annex 14 and AGL
Airfield Ground Lighting is a fundamental part of aerodrome visual aids. The primary international reference is ICAO Annex 14, Volume I, Aerodrome Design and Operations, which sets Standards and Recommended Practices for the visual aids that support runway operations, taxiing, approach, low-visibility operation, surface movement, runway identification, approach slope guidance and runway-entry awareness.
Current ICAO reference status (as listed by the ICAO Store)
| Publication | Edition and status |
|---|---|
| Annex 14, Volume I | 9th Edition, July 2022 |
| Amendment 18 | Dated 4 August 2025; applicable from 27 November 2025 |
| Corrigendum No. 2 | Dated 18 March 2026 |
| Corrigendum No. 3 | Dated 8 June 2026 |
| Doc 9157 Part 4, Visual Aids | 5th Edition, 2021, with amendments listed including one dated September 2025 |
| Doc 9157 Part 5, Electrical Systems | 2nd Edition, 2017, with an amendment listed January 2020 |
The ICAO Document Hierarchy
Read ICAO material as a hierarchy, not one isolated document. For numerical requirements, identify the exact controlled provision before putting a number into a compliance document.
Doc 9157 Part 4: Visual Aids
Functional requirements, approach lighting, light characteristics for precision approach runways and taxiways, runway and taxiway lighting, surface movement guidance and control systems, taxiing guidance signs and obstacle lighting.
Doc 9157 Parts 5 and 6
Part 5 covers electrical systems and complements Part 4. Part 6 covers frangibility. ICAO lists Parts 1 to 6 as supporting material for aerodrome certification and design.
Where Does This Requirement Come From?
These sources are not interchangeable. Pick one to see how to cite and use it.
How to use it
Common mistake
The ICAO Aerodrome Lighting System
Aerodrome lighting is a coordinated visual system. No single runway lighting configuration applies to every aerodrome: the arrangement depends on runway classification, instrument approach, operational category, runway width and geometry, visibility conditions, aircraft operations and national requirements.
| Functional group | Includes |
|---|---|
| Runway visual aids | Edge, threshold, runway end, centreline and touchdown zone lights |
| Approach visual aids | Approach lighting systems, PAPI, APAPI and other applicable approach aids |
| Taxiway visual aids | Edge lights, centreline lights, stop bars, runway guard lights |
| Information and control | Signs, lighting controls, monitoring, power systems |
Related Guides
AGL components Runway lighting systems Taxiway lighting systems Approach lighting systemsRunway Lighting Requirements
Edge lights
Define the lateral runway limits and give longitudinal guidance. Consider location, spacing, orientation, elevation, colour, intensity, beam distribution, condition and visibility from the relevant operating directions.
Centreline lights
Used where the runway operation needs centreline guidance, especially precision approach and reduced visibility. In-pavement, so watch rubber contamination, water ingress, lens condition, fixture elevation and impact damage.
Threshold lights
Identify the start of the landing area for an arriving aircraft. Verify colour, intensity, alignment, beam distribution, position and orientation, and treat them together with edge, approach and end lighting and markings.
Runway end lights
Give the visual indication at the runway end. For bidirectional fixtures, test each viewing direction; inspecting only one optical direction is a common mistake.
Touchdown zone lights
Extra guidance in the touchdown area, usually multiple in-pavement fixtures. Check location, spacing, optical direction, intensity, colour, contamination and pavement interface.
Precision approach runways
Need more complex lighting for lower-visibility operations: precision approach lighting, edge, centreline and touchdown zone lighting, taxiway centreline lighting, stop bars, PAPI, enhanced control and monitoring, and secondary power.
Taxiway Lighting, Stop Bars and Runway Guard Lights
ICAO Taxiway Lighting Requirements
Taxiway lighting supports movement between runways, aprons, terminals, holding areas and intersections. The configuration depends on taxiway function and aerodrome design.
Edge and centreline lights
Edge lights (elevated or in-pavement) mark taxiway limits; centreline lights give longitudinal guidance. Assess centreline lighting as a continuous visual path, not independent fixtures. Check alignment, spacing, colour, intensity, contamination, water ingress and damage.
Stop bars
A lighting function and an operational control function: stop-bar lights, control logic, monitoring and runway-entry procedures. Test lamp or fixture operation, intensity, colour, alignment, control and monitoring response, and interlocks where applicable. Availability and control matter especially in low visibility.
Runway guard lights
Enhanced visual indication at runway holding positions: elevated or in-pavement, flashing or steady, separately controlled. Verify requirements from the current design and equipment documents, and test operation, colour, intensity, flash characteristics, alignment, control and monitoring.
ICAO Approach Lighting Requirements
Visual guidance before the threshold: centreline lights, crossbars, elevated and inset lights, sequenced lighting and associated aids. Evaluate the visual pattern, not one fixture at a time.
Related Guides
Taxiway lighting photometry Runway guard lights and stop bars Runway incursion prevention and SMGCS Taxiway guidance signsPAPI Requirements
A conventional four-unit PAPI uses different individual aiming angles to create the approach-slope sequence. ICAO requirements address it within approach-slope guidance, siting and visual-aid design.
| Indication | Aircraft position |
|---|---|
| 4 white | High |
| 3 white + 1 red | Slightly high |
| 2 white + 2 red | On the designed path |
| 1 white + 3 red | Slightly low |
| 4 red | Low |
Location
Comes from the approved aerodrome design: threshold position, PAPI elevation, runway longitudinal profile, approach slope, aircraft eye height, threshold-crossing geometry, obstacle clearance and any ILS relationship. Do not publish one "ICAO PAPI distance from threshold" as universal.
Aiming
Units are individually aimed to create the visual sectors. Parameters: nominal approach slope, unit setting angles, elevation, azimuth, spacing and mechanical stability. Take values from the applicable controlled standard and approved design, verify independently at commissioning and reassess after disturbance or relevant maintenance.
Elevation and threshold geometry
PAPI elevation, position, threshold elevation, selected approach slope and aircraft eye-to-wheel geometry together set the threshold-crossing condition. Tie the installation to survey data and a controlled design calculation.
Photometry
Depending on requirements: intensity, colour, beam distribution, red/white transition, horizontal and vertical coverage and alignment-related characteristics, using calibrated equipment. ICAO operational material lists PAPI calibration among visual-aid status considerations.
Related Guides
ICAO PAPI requirements PAPI engineering guide PAPI installation and aiming PAPI alignment and maintenanceLighting Colours, Intensity and Photometry
ICAO Lighting Colour Requirements
The meaning of a light often depends on its colour and location. Treat colour as an engineering parameter, and use the applicable photometric or chromaticity procedure where objective measurement is required. Do not publish one generic coordinate as an ICAO limit without confirming its source and applicability.
ICAO Light Intensity Requirements
Tied to the light's visual function: lighting type, runway or taxiway application, operational category, direction, beam distribution, operating condition and environment. High peak output does not prove compliance.
Photometry
Gives quantitative evidence of intensity, distribution, coverage, colour, alignment and degradation, supporting commissioning, acceptance, periodic inspection, maintenance, rehabilitation and troubleshooting.
The relevant question is: does the fixture provide the required photometric performance over the specified angular region and operating condition? That is why intensity and distribution are considered together.
Photometric testing workflow
Review the requirement
Identify the applicable standard and fixture type.
Review the drawing
Confirm fixture location and optical function.
Verify equipment
Check photometer calibration and configuration.
Prepare the fixture
Inspect and clean where required.
Establish geometry
Set reference, distance, height and orientation.
Set the lighting condition
Operate the circuit at the specified intensity.
Measure
Record the applicable photometric parameters.
Evaluate
Compare with the controlled acceptance criterion.
Rectify
Clean, align, repair or replace.
Retest
Confirm the final result.
Related Guides
AGL photometry Runway lighting photometry Taxiway lighting photometry Photometric testing guideElectrical Systems, Secondary Power and Control
Visual performance depends on reliable power, which is why ICAO separates visual-aid guidance (Doc 9157 Part 4) from electrical-system guidance (Part 5). A visual deficiency can originate in the electrical infrastructure.
Secondary power
Can be critical for lower-visibility operations: standby generators, UPS, automatic transfer equipment, independent feeders and dedicated AGL supplies. Switching and restoration performance depends on operational category and applicable requirements. ICAO contingency guidance lists power-system status as part of aerodrome readiness.
Control and monitoring
ATC or airport operations command the ALCMS, which controls the CCR or circuit controller and the AGL circuit. Status returns from lighting and circuits through monitoring and ALCMS to the operator. Monitoring covers CCR, circuit and lighting status, faults, communications, equipment availability and alarms.
Frangibility
Doc 9157 Part 6 covers frangibility. It is relevant to elevated runway, taxiway and approach lights, signs, PAPI and other structures in aircraft operating areas. Assess the complete installation, not the fixture alone.
Maintenance and Inspection
ICAO treats maintenance as essential to visual-aid reliability: installed lighting must keep operating at the required performance. Activities include visual inspection, cleaning, fixture inspection, electrical testing, alignment checking, photometric measurement, corrective maintenance, replacement and documentation. Inspection frequency comes from the airport's approved maintenance programme and regulatory requirements.
Runway and taxiway inspection
Look for failed fixtures, damaged lenses, contamination, misalignment, water ingress, loose mounting and mechanical damage. On taxiways add in-pavement contamination, standing water and control faults. Take measurements where severity or cause needs establishing.
PAPI maintenance covers
- Optical: lenses, filters, light source, colour, beam
- Mechanical: foundation, mounting, level, alignment, aiming, damage
- Electrical: supply, wiring, connectors, control, monitoring
- Performance: intensity, coverage, colour, alignment, photometry
Documentation, Acceptance Testing and Electrical vs Photometric Tests
A compliance file should show what was designed, installed and tested, what requirement was applied, what deficiencies were found, what corrective action was completed and the final result.
Design and equipment records
- AGL, runway, taxiway and approach layouts
- PAPI siting and geometry
- Electrical drawings and control diagrams
- Equipment schedules, datasheets, certification documents, manuals
Testing and final records
- Cable, insulation, electrical and CCR tests
- Photometric, PAPI, sign and control-system reports
- As-built drawings and maintenance baseline
- Corrective-action register, retests, commissioning certificate
Acceptance testing against the approved design
| Test area | Examples |
|---|---|
| Electrical | Continuity, insulation, circuit characteristics, transformer testing, CCR operation |
| Functional | Switching, intensity steps, control, monitoring, alarms |
| Optical | Photometry, colour, beam distribution, alignment |
| Special visual aids | PAPI, signs, stop bars, runway guard lights |
| Final | Inspection, punch-list closure, retesting, documentation |
Electrical test asks
Is the equipment receiving the required electrical condition?
Photometric test asks
Is the light producing the required optical performance?
ICAO and FAA, and ICAO in India
ICAO
Centred on Annex 14, the ICAO aerodrome design manuals, ICAO operational guidance and State implementation: international SARPs and supporting design guidance.
FAA
Multiple dedicated advisory circulars and equipment specifications covering fixtures, CCRs, isolation transformers, PAPI, light bases, signs, ALCMS and maintenance, for U.S. airport installations.
Do not write
"ICAO requires this exact PAPI spacing," unless the number has been verified against the applicable ICAO provision.
Write instead
"The PAPI spacing shall comply with the applicable current ICAO and State requirements and the approved project design," and cite the exact provision where a numerical statement is needed.
Indian airports
National regulations may incorporate or modify international requirements for local implementation, so an Indian airport compliance document should not cite Annex 14 in isolation. India's Ministry of Civil Aviation reported 2025 amendments to CAR Section 4, Series B, Part I (Aerodrome Design and Operations).
ICAO Aerodrome Lighting Quick Reference
| Area | Engineering focus |
|---|---|
| Runway edge | Position, spacing, colour, intensity, beam |
| Threshold | Colour, intensity, direction, location |
| Runway end | Colour, intensity, direction |
| Centreline | Spacing, colour, intensity, alignment |
| Touchdown zone | Layout, intensity, optical performance |
| Approach | Pattern, intensity, alignment, colour |
| Taxiway edge | Position, colour, intensity, alignment |
| Taxiway centreline | Layout, spacing, colour, intensity |
| Stop bar | Colour, intensity, control, monitoring |
| Runway guard lights | Operation, colour, flashing and control |
| PAPI | Siting, elevation, aiming, TCH/MEHT, photometry |
| Signs | Legend, location, illumination, control |
| Electrical | Power, CCR, series circuits, transformers |
| Control | Switching, intensity, ALCMS, monitoring |
| Maintenance | Inspection, measurement, corrective action |
Common ICAO Compliance Mistakes
Using an outdated Annex 14 edition
Always check amendments and corrigenda.
Mixing FAA and ICAO requirements
An FAA value is not automatically an ICAO value.
Using a generic PAPI distance
PAPI siting is a geometry problem, not a fixed-distance rule.
Checking only that lights are ON
Functional operation does not prove photometric compliance.
Ignoring the electrical system
A visual deficiency can start in the CCR, transformer, cable or connector.
Ignoring national implementation
ICAO provisions are implemented through the State's regulatory system.
Publishing unverified numerical values
Tie exact requirements to the controlled source.
Ignoring maintenance
Compliance is not only commissioning; the installation must stay serviceable.
ICAO AGL Compliance Checklist
Click an item to mark it complete.
Regulatory
Lighting
Electrical, optical and maintenance
Documentation
Compliance workflow
Quick Knowledge Check
Q1. Which ICAO document is the principal regulatory reference for aerodrome lighting?
Q2. Why should an FAA number not be called an ICAO requirement?
Q3. How is PAPI location determined?
Q4. A light is on and electrically correct. Is it proven compliant?
Q5. What should an Indian airport compliance document do?
Explore More AGL Engineering
ICAO PAPI Requirements
PAPI siting, aiming, elevation and compliance.
Open ICAO PAPI Requirements →ICAO Annex 14 AGL Requirements
SARPs covering visual aids.
Open ICAO Annex 14 AGL Requirements →Runway Lighting Photometry
Runway fixture testing and reporting.
Open Runway Lighting Photometry →Taxiway Lighting Photometry
Taxiway fixture testing and reporting.
Open Taxiway Lighting Photometry →PAPI Engineering Guide
Working principle, geometry and siting.
Open PAPI Engineering Guide →Testing & Commissioning
Electrical, optical and handover testing.
Open Testing & Commissioning →Airport Isolating Transformer
Ratings, types and testing.
Open Airport Isolating Transformer →Junction Boxes & Transformer Housings
Light bases and housings.
Open Junction Boxes & Transformer Housings →Cite the Provision. Prove the Performance.
From the ICAO framework to commissioning evidence and maintenance records, explore the complete AGL knowledge base.
Explore the AGL Engineering Knowledge Hub
Fundamentals
Standards & Compliance
Runway, Taxiway & Approach Lighting
Surface Movement & Safety
PAPI
Electrical Engineering & Power
Photometry & Testing
Maintenance, Inspection & Safety
Resources, Documentation & Careers
ICAO Aerodrome Lighting FAQ
Q1What is ICAO Annex 14?
The international framework for aerodrome design and operations. Volume I covers aerodromes and includes requirements for visual aids such as aerodrome lighting.
Q2Which ICAO document covers aerodrome lighting?
The principal regulatory reference is ICAO Annex 14, Volume I. Detailed visual-aid design information is in the Aerodrome Design Manual, Part 4 — Visual Aids (Doc 9157 Part 4).
Q3What runway lights are covered by ICAO requirements?
Depending on the runway configuration: edge lights, threshold lights, runway end lights, centreline lights, touchdown zone lights and approach lighting.
Q4What taxiway lights are covered by ICAO?
Taxiway edge lights, centreline lights, stop bars, runway guard lights and associated visual guidance systems.
Q5Does ICAO specify PAPI requirements?
Yes. PAPI is part of the aerodrome visual-aid framework, and its siting, approach-slope geometry and performance must meet the applicable provisions.
Q6Does ICAO specify one universal PAPI angle?
PAPI geometry follows the applicable design and operational requirements. Nominal approach slope and individual unit settings should not be reduced to an arbitrary universal field setting.
Q7Does ICAO specify one universal PAPI distance from the runway?
No. PAPI location comes from the approved geometric design, including approach slope, elevations, threshold geometry and aircraft and operational considerations.
Q8Does ICAO require runway lighting photometry?
Photometric performance is part of the technical evaluation of visual aids where applicable, and ICAO guidance addresses measurement and maintenance of visual-aid characteristics. Take the exact procedure and acceptance criteria from the applicable controlled documents.
Q9What is the difference between ICAO and FAA airport lighting standards?
ICAO sets international SARPs. The FAA uses its own U.S. regulatory and advisory framework with dedicated equipment specifications. The principles are similar, but numerical requirements and equipment classifications can differ.
Q10Can FAA requirements be used on an ICAO airport?
Only when the project or competent authority specifically adopts them. Do not present FAA requirements as ICAO requirements without verification.
Q11What standards apply to airport lighting in India?
Consider the applicable DGCA requirements, the ICAO framework, AAI or airport-specific specifications and approved project documentation. DGCA's CAR Section 4, Series B, Part I is a key Indian aerodrome reference.
Q12What is ICAO's current Annex 14 Volume I edition?
ICAO's store lists the 9th Edition, July 2022, with Amendment 18 dated 4 August 2025 and corrigenda including No. 2 dated 18 March 2026 and No. 3 dated 8 June 2026. Always check the controlled copy before issuing a compliance statement.
Q13What is ICAO Doc 9157 Part 4?
The Aerodrome Design Manual, Part 4 — Visual Aids, which gives design information on airport visual aids, including approach lighting, runway and taxiway lighting and guidance signs.
Q14What is the role of ICAO Doc 9157 Part 5?
Part 5 addresses electrical systems and complements the visual-aid guidance in Part 4.
Q15Does ICAO cover AGL maintenance?
Yes. The ICAO aerodrome framework addresses maintenance and serviceability of visual aids, with supporting guidance for preventive maintenance and operational readiness.
Q16Why shouldn't ICAO and FAA numbers be mixed?
A value from an FAA advisory circular is not automatically an ICAO requirement. Cite the exact verified provision, or state that the design must comply with the applicable current ICAO and State requirements.
Engineering & Expert Notes
Understand the Document Hierarchy
FrameworkKnow what is a standard, what is a recommendation and what is guidance before applying a requirement.
Cite the Current Amendment
CurrencyAnnex content is amended. Verify the current text before using it in design or compliance statements.
Requirements Depend on Runway Type and Operations
ApplicabilityCheck the runway category and operational use before selecting the applicable requirement.
Secondary Power Is Part of the Picture
PowerCheck switch-over requirements for the relevant runway type.
State Rules May Differ
NationalCheck the national regulations and any differences filed with ICAO.
Maintain Evidence
RecordsKeep the design basis and inspection records that show how requirements were met.
Understand AGL. Build Your Engineering Skills.
You now understand how the ICAO framework treats aerodrome lighting, and how to separate requirements, guidance, national rules and airport specifications when you test, document and maintain AGL systems.
Take the next step with Precision AGL Academy.
Learn AGL Step by Step
Build your knowledge through structured technical learning covering:
Move from understanding how AGL works to developing the practical knowledge needed to analyse, operate and maintain complete AGL systems.
Follow the Academy
Important Notice, Disclaimer & Limitation of Liability
Please read before relying on any content on this page or on any record downloaded from it.
- Purpose and intended users. This page is an independent educational and informational reference for competent, suitably trained and authorised airfield ground lighting (AGL) and aerodrome personnel. It is not professional engineering, legal or regulatory advice, and using it creates no professional or client relationship. Learning-path and Academy references describe stages of learning only and are not a certification, accreditation or authorisation.
- Safety. Work on series circuits, constant current regulators (CCRs), isolating transformers, cables, connectors and lighting fixtures can be fatal. Always apply the aerodrome’s permit-to-work and isolation/LOTO procedures, prove dead, use correctly rated instruments and PPE, and follow the manufacturer’s instructions. Nothing here authorises work on live equipment or the bypassing of any safety device or interlock.
- Aviation operations. Nothing on this page authorises return to service, the installation, adjustment or modification of any aviation visual aid, a change of operating category (CAT I/II/III), a NOTAM or any aerodrome certification decision. These rest with the aerodrome operator, the air navigation service provider and the competent regulator.
- Standards, regulations and named sources. References to ICAO, FAA, EASA, DGCA, AAI, IEC, IEEE, ISO, BIS and other standards, regulations, AIP material and published sources, and statements about what a named airport, State or authority has published, are summaries for orientation as understood when the page was prepared. They are not official text, may be incomplete, amended or superseded, and have not been independently verified. Consult the current official editions, including the current AIP, AIRAC cycle and NOTAMs. Following this content does not guarantee compliance with any law, standard or approval, and official documents, regulations, the approved design and manufacturers’ instructions always prevail.
- Generic content; no warranty. Values, tolerances, intervals, sequences, examples, checklists and pass/fail or “compliant” wording are generic and indicative; real installations differ in design, make, model, age and condition. Content is provided “as is” and “as available”, without warranty of any kind, express or implied, including accuracy, completeness, currency or fitness for a particular purpose.
- Diagrams. Diagrams on this page are original schematic illustrations, are not to scale and are not engineering drawings. Do not use them to work on, connect, set or modify equipment.
- Limitation of liability. To the fullest extent permitted by applicable law, Precision AGL Academy and its owners, authors and contributors are not liable for any injury, death, loss, damage, downtime, penalty or regulatory consequence, whether direct or indirect, arising from the use of, reliance on, or inability to use this content. Nothing in this notice excludes or limits any liability that cannot lawfully be excluded or limited.
- Independence and trademarks. This is an independent publication, not affiliated with or endorsed by ICAO, the FAA, EASA, the IEC, DGCA, AAI, any airport, regulator, employer or equipment manufacturer. Third-party names, standard designations and trademarks (including Megger®) belong to their respective owners and are used for identification only.
- Copyright and use. © 2026 Precision AGL Academy. All rights reserved. The text, structure, diagrams and compilation of this page are protected by copyright. You may read it and use it for personal reference and internal training, keeping this notice attached; any other copying, republication, scraping or commercial use needs our prior written permission. Credited third-party photographs remain subject to their owners’ terms.
- Corrections. Content is reviewed periodically, with no obligation to update. To report an error, safety concern, copyright, privacy or other rights issue, write to precisionaglsolutions@gmail.com.