Airfield Signs
WGS Sign Boards for Airfield Ground Lighting
Structured visual information for aircraft and vehicle operators
WGS sign boards communicate identification, routing, location, mandatory instructions and other approved operational information at taxiways, aprons, runway entrances and associated airport infrastructure.
Supplied by Precision AGL Solutions
Product Overview
WGS Sign Boards
What They Are
WGS sign boards provide structured visual information for aircraft and vehicle operators within airport movement areas. They communicate identification, routing, location, mandatory instructions and other approved operational information at taxiways, aprons, runway entrances and associated airport infrastructure.
Precision AGL Solutions supplies WGS sign board configurations selected according to the required legend, character arrangement, board dimensions, illumination method, mounting arrangement, viewing distance and project specification.
A Typical Assembly May Include
- Sign board – main structural and visual body
- Legend – approved characters, arrows, numbers, letters or symbols
- Sign face – visible surface carrying the information
- Illumination system – where illuminated
- Support structure – posts, brackets, frames or other approved mounting
- Electrical interface – for illuminated configurations
The system can be configured for a new airport development, movement-area extension, apron redevelopment, runway or taxiway rehabilitation, or replacement of existing airfield signage. Final construction depends on the application, airport environment and project requirements.
Applications
Where WGS Sign Boards Are Used
TaxiwaysGuidance along taxi routes.
Taxiway intersectionsRouting at intersections.
ApronsApron identification and routing.
Aircraft stand areasStand-area information.
Runway entrancesMandatory instruction and location signs where taxiways meet the runway.
Holding positionsMandatory and holding information.
Movement-area identificationLocation identification.
Aircraft routing locationsDirection and routing.
Airport infrastructure projectsNew and extended facilities.
Apron redevelopmentReconfigured apron layouts.
Taxiway upgradesUpgrade and rehabilitation.
Replacement signage projectsReplacement of existing signs.
The exact sign category and legend should be established from the approved airport signage plan and project drawings.
Sign Board Configuration
Configured Around the Information to Be Communicated
The Design May Incorporate
- Letters
- Numbers
- Arrows
- Operational legends
- Location identifiers
- Directional information
- Mandatory instructions
- Project-specific symbols
Legend Approval
The legend should be finalized from approved airport documentation before production.
The character arrangement is one of the primary design considerations for an airfield sign board. Consistent typography and character proportions should be maintained across a coordinated airport signage system.
Legend and Character Configuration
Character Arrangement Drives the Design
The configuration may depend on:
- Character height
- Number of characters
- Number of lines
- Arrow requirements
- Symbol requirements
- Viewing distance
- Sign category
- Available board dimensions
- Applicable airport standard
Sign Categories & Colours
Sign Type Determines Function and Colour
| Sign Category | Typical Use | Colour Scheme |
|---|---|---|
| Mandatory instruction | Runway holding positions, ILS CAT I/II/III holding positions and no-entry instructions | White inscription on red background |
| Location | Identifies the taxiway, apron or runway on which the aircraft or vehicle is located | Yellow inscription on black background (yellow border where required) |
| Direction / destination | Indicates the direction of turn or route to a taxiway, runway, apron or other destination | Black inscription on yellow background |
| Information | Other approved operational information, such as stand or apron information | Black inscription on yellow background |
Sign colours follow ICAO Annex 14 and the equivalent FAA requirements and are not a free design choice. Mandatory instruction signs must always be coordinated with the corresponding runway-holding position marking. A location sign is normally provided together with direction signs, and with runway designation signs except at runway/runway intersections; confirm the pairing in Annex 14 Chapter 5. Confirm the category and colour of every sign against the approved signage plan and the applicable edition of the standard.
Board Size
Determined From the Legend and Viewing Requirements
Factors Include
- Character dimensions
- Character spacing
- Border dimensions
- Number of characters
- Number of lines
- Arrows or symbols
- Illumination arrangement
- Mounting requirements
Consistency
For multiple signs within one airport project, standardized board proportions can help maintain visual consistency.
Viewing Distance
Sized for the Intended Viewer
Sign board dimensions and character size should be selected according to the intended viewing distance. The design should consider whether the primary user is:
Aircraft flight crewCockpit viewing geometry.
Ground vehicle operatorVehicle viewing position.
Apron operatorApron operations.
Airport operations / maintenanceOperations and maintenance personnel.
The required recognition distance should be established during the signage design process.
Illumination Options
Illuminated or Retroreflective, as Operations Require
Configuration
WGS sign boards can be configured as illuminated or retroreflective (non-illuminated) signs according to the operational requirement and applicable standard. Where illumination is required, the system may incorporate LED technology for controlled and consistent sign-face illumination.
The selected illumination method should provide clear information without producing excessive glare.
Under ICAO Annex 14, signs are to be illuminated where intended for use in runway visual range below 800 m, at night on instrument runways, or at night on non-instrument runways of code number 3 or 4; otherwise a retroreflective sign may be acceptable where the authority permits. Confirm the exact wording against your edition. Sign luminance should follow the airfield brightness-step settings so that signs stay balanced with adjacent taxiway lights.
Illumination Selection Should Consider
- Night-time operations
- Reduced visibility
- Ambient apron lighting
- Viewing distance
- Sign category
- Required luminance
- Optical uniformity
- Airport electrical infrastructure
LED Illumination
Modern, Efficient, Low-Maintenance
Potential Advantages
- Long operating life
- Efficient operation
- Reduced lamp replacement
- Consistent illumination
- Rapid switching
- Compact construction
- Reduced maintenance requirements
One Complete Assembly
The LED modules, optical system, power supply and sign face should be engineered as one complete assembly.
Optical Uniformity
Even Illumination Across the Sign Face
The Optical Design Should Minimize
- Bright spots
- Dark areas
- Uneven legend illumination
- Localized glare
- Variations across the sign face
Relevant Design Factors
- LED positioning
- Sign depth
- Internal reflectivity
- Diffuser construction
- Sign-face material
- LED output
- Power-supply regulation
Final optical performance should be assessed for the complete sign assembly.
Materials & Corrosion Protection
Suitable for Long-Term Outdoor Airport Operation
Material Selection Can Consider
- Structural requirements
- Weight
- Corrosion resistance
- UV exposure
- Temperature
- Humidity
- Rain
- Wind
- Cleaning requirements
- Chemical exposure
Appropriate Construction May Include
- Corrosion-resistant materials
- Protective coatings
- Weather-resistant finishes
- Corrosion-resistant fasteners
- Sealed electrical interfaces
- Suitable cable entries
Airport signs can be exposed to moisture, salt, cleaning chemicals and other corrosive conditions. Coastal and high-humidity environments may require additional corrosion protection. The final material specification should follow the project environment and applicable requirements.
Mounting Arrangements
Appropriate to the Location and Airport Layout
Possible Arrangements
- Single-post mounting
- Two-post mounting
- Multi-post structures
- Ground-mounted frames
- Bracket mounting
- Project-specific support structures
Mounting Should Consider
- Aircraft clearance
- Vehicle clearance
- Visibility
- Wind loading
- Foundation requirements
- Maintenance access
- Frangibility requirements
Frangibility
Review Against Obstacle and Frangibility Requirements
Why It Matters
ICAO Annex 14 requires signs on the movement area to be frangible, and those near a runway or taxiway to be low enough to preserve clearance for propellers and engine pods. The support arrangement should therefore be reviewed against the applicable obstacle-limitation and frangibility requirements.
The applicable arrangement depends on the exact installation location and project criteria.
The Review May Include
- Sign enclosure
- Support posts
- Base assemblies
- Fasteners
- Breakaway components
- Foundations
- Cable routing
- Sign height above ground and edge clearance
Electrical Interface
Coordinated With Airport Infrastructure
Relevant Parameters Can Include
- Series circuit (constant-current, via isolating transformer) or parallel (constant-voltage) supply
- Input voltage / current
- Power consumption
- Power-supply arrangement
- Circuit configuration
- Local switching
- Central control
- Dimming and brightness steps
- Surge protection
- Earthing and bonding
- Cable entry
For Illuminated Signs
The electrical system should be coordinated with the airport's available infrastructure.
Where the sign forms part of an existing airfield lighting system, the electrical interface must be specifically verified before connection.
Airfield Lighting Integration
Part of a Wider Visual Guidance System
Taxiway lightingEdge and centreline lights.
Runway lightingRunway edge, threshold and centreline systems.
Stop barsSwitchable lights at runway-holding positions.
Runway guard lightsAlert operators at runway-holding positions.
Apron stand guidanceStand lead-in and stop guidance.
Pavement markingsComplementary markings.
Other airfield signsCoordinated signage.
The objective is to provide a consistent sequence of information to aircraft and vehicle operators throughout the movement area.
Technical Data
Typical Project Considerations
| Parameter | Typical Project Consideration |
|---|---|
| Product Type | WGS airfield sign board |
| Application | Movement-area visual guidance |
| Board Size | Project-specific |
| Sign Category | Mandatory instruction / location / direction / information |
| Colour | Per sign category (ICAO Annex 14 / FAA) |
| Legend | Approved project legend |
| Character Configuration | Project / standard specific |
| Character Height | Project-specific |
| Illumination | Retroreflective or internally illuminated |
| Light Source | LED where applicable |
| Luminance | Project-specific |
| Optical Uniformity | Project-specific |
| Power | Sign-specific |
| Electrical Interface | Project-specific |
| Mounting | Single-post / multi-post / frame / bracket |
| Materials | Weather- and corrosion-resistant |
| Frangibility | Frangible support within the movement area per applicable standard |
| Cable Entry | Project-specific |
| Environmental Performance | Suitable for airfield installation |
Character heights and sign positions follow ICAO Annex 14 and FAA AC 150/5340-18H according to sign type and runway code or approach category: take them from the approved signage plan. Exact board dimensions, character height, luminance, power consumption, electrical characteristics, environmental rating, mounting details and optical performance should be confirmed against the approved product and project specification.
WGS Sign Board Selection
An Eight-Step Selection Process
Identify the ApplicationTaxiway guidance, location identification, direction, mandatory instruction, apron routing, stand identification or other approved airport information.
Confirm the LegendProvide the exact approved wording, letters, numbers, arrows and symbols.
Establish Viewing RequirementsDetermine the intended viewing direction and recognition distance.
Select Character ConfigurationConfirm character height, spacing, number of lines and other graphical requirements.
Establish Board DimensionsBase the dimensions on the complete legend and required viewing characteristics.
Select IlluminationRetroreflective (non-illuminated) or internally illuminated (LED), as required by the operation and applicable standard.
Confirm Electrical RequirementsFor illuminated signs, establish the available supply, circuit and control arrangement.
Confirm MountingDetermine support arrangement, mounting height, foundation, clearance and frangibility requirements.
Installation Considerations
Review Before Installation
- Approved sign location
- Sign orientation
- Legend
- Character size
- Board dimensions
- Viewing direction
- Aircraft clearance
- Vehicle clearance
- Foundation
- Cable routing
- Electrical connection
- Earthing and bonding
- Frangibility
- Maintenance access
The sign should be positioned to remain visible while avoiding interference with aircraft, vehicles, ground-support equipment or other airport infrastructure.
Coordination with Markings & Lighting
One Consistent Visual Environment
Pavement Markings
- Taxiway centreline markings
- Runway-holding position markings
- Stand lead-in lines
- Stand identification markings
- Apron taxi lane markings
- Intermediate holding-position markings
Consistent information between the sign board and pavement marking system helps reduce operator confusion.
Airfield Lighting
- Taxiway edge lights
- Taxiway centreline lights
- Stop bar lights
- Runway guard lights
- Lead-on / lead-off lights
- Apron stand guidance lights
The sign should remain clearly identifiable without being obscured or visually overwhelmed by adjacent lighting.
Commissioning
Inspected Against Approved Project Documentation
- Correct legend
- Correct sign category
- Correct location
- Correct orientation
- Character visibility
- Board condition
- Illumination operation
- Luminance
- Optical uniformity
- Electrical operation
- Mounting stability
- Cable integrity
- Clearance
- Structural condition
Illuminated signs should preferably be evaluated during night-time operation as well as daytime inspection.
Maintenance
Preserving Sign Visibility and Structural Condition
- Cleaning the sign face
- Inspecting the legend
- Checking illumination
- Inspecting LED modules
- Checking power supplies
- Inspecting electrical connections
- Checking cable entries
- Inspecting support structures
- Checking fasteners
- Checking for corrosion
- Checking colour and retroreflectivity
- Checking enclosure condition
Any reduction in visibility or illumination should be investigated promptly.
Common Problems
Typical Issues and Possible Causes
| Problem | Possible Causes / Notes |
|---|---|
| Reduced visibility | Dirty sign face, damaged legend, faded surfaces, poor positioning, obstruction by equipment, inadequate illumination |
| Uneven illumination | LED module failure, optical degradation, power-supply problems, internal component damage |
| Incorrect legend | An outdated or incorrect legend can result in operational confusion. Check displayed information against the latest approved airport signage schedule. |
| Physical damage | Vehicle impacts, ground-support equipment, maintenance activities, aircraft-engine airflow, weather. Inspect, then repair or replace damaged boards or supports. |
| Faded colour / reduced contrast | UV ageing of sign-face material, filter or diffuser degradation, dirt film. Compare against the required sign colours and replace degraded faces. |
| Corrosion | Moisture, salt, chemicals and damaged protective finishes can deteriorate the sign structure and mounting hardware. |
Replacement and Upgrade Applications
Modernize or Replace Existing Signage
WGS Sign Boards Can Be Used For
- Airport signage modernization
- Taxiway rehabilitation
- Apron redevelopment
- Terminal expansion
- Runway upgrades
- Movement-area improvements
- Replacement of damaged signage
- Conversion to LED illumination
Reuse Assessment
Existing installations can be assessed for reuse of suitable mounting structures, foundations, cable routes and electrical infrastructure.
Procurement Checklist
When Requesting WGS Sign Boards, Provide
- Airport / project name
- Sign category
- Exact legend
- Quantity
- Character height
- Board dimensions
- Viewing distance
- Illumination requirement
- Electrical supply
- Control requirement
- Mounting arrangement
- Foundation information
- Frangibility requirement
- Environmental conditions
- Applicable airport standard
- Required documentation
This information allows the sign board to be configured accurately for the intended installation.
Safety
Electrical Safety — Isolation and Lock-Out
WARNING — never open a live series circuit. An open series circuit driven by a constant-current regulator can produce dangerously high voltage. Opening, cutting or disconnecting any part of an energised circuit can cause serious injury or death and damage equipment.
- De-energise the circuit at the regulator and apply the site lock-out / tag-out (LOTO) procedure before any work
- Where the circuit must be isolated or shorted, use the series circuit cut-out switch or approved isolation device — not an improvised bypass
- Verify the circuit is de-energised and the output is isolated before touching conductors, connectors, splices or transformers
- Work only under the airport's permit-to-work system, using qualified personnel and the manufacturer's instructions
- Follow the applicable national electrical safety regulations and site procedures
Standards & References
Applicable Requirements Govern
WGS sign boards should be designed and installed according to the applicable airport signage requirements, aerodrome visual-aid standards, national aviation regulations and project documentation.
Potential References May Include
- ICAO Annex 14 Vol. I – signs (Chapter 5, Appendices 1 and 4)
- ICAO Doc 9157 Aerodrome Design Manual, Part 4 – Visual Aids
- FAA AC 150/5345-44L (runway and taxiway signs, issued 30 September 2024) and AC 150/5340-18H (airport sign systems)
- DGCA India aerodrome requirements (CAR Section 4) and other national civil aviation authority requirements
- Airport-specific signage standards
- Airport electrical standards
- Approved airport signage schedules
- Project tender specifications
- Approved construction drawings
The applicable edition and exact project requirements should be verified before manufacture and installation.
Documentation
Support for Engineering, Procurement and Approval
Documentation Available
- Product datasheets
- Sign-face drawings
- Legend schedules
- General arrangement drawings
- Mounting details
- Foundation information
- Electrical interface information
- Installation instructions
- Operation and maintenance documentation
- Technical submittals
- Inspection documentation
Tailored To Your Process
Documentation can be prepared according to the requirements of the airport engineering, procurement, consultant and project approval process.
FAQ
WGS Sign Boards — Frequently Asked Questions
What are WGS sign boards?
WGS sign boards provide structured visual information for aircraft and vehicle operators within airport movement areas, communicating identification, routing, location, mandatory instructions and other approved operational information at taxiways, aprons, runway entrances and associated infrastructure.
What are the sign categories and their colours?
Mandatory instruction signs (runway holding positions, ILS CAT I/II/III holding positions and no-entry) are white inscription on red. Location signs are yellow inscription on black, with a yellow border where required. Direction and destination signs, and information signs, are black inscription on yellow. Sign colours follow ICAO Annex 14 and the equivalent FAA requirements and are not a free design choice.
When must a sign be illuminated?
Under ICAO Annex 14, signs are to be illuminated where intended for use in runway visual range below 800 m, at night on instrument runways, or at night on non-instrument runways of code number 3 or 4. Otherwise a retroreflective sign may be acceptable where the authority permits. Confirm the exact wording against your edition.
How is the board size decided?
From the legend and viewing requirements: character dimensions and spacing, border dimensions, the number of characters and lines, arrows or symbols, the illumination arrangement and mounting. Character height and sign positions follow ICAO Annex 14 and FAA AC 150/5340-18H according to sign type and runway code or approach category, so take them from the approved signage plan.
Why does viewing distance matter?
Board dimensions and character size should suit the intended viewer, whether aircraft flight crew, a ground vehicle operator, an apron operator or airport operations personnel. The required recognition distance should be established during the signage design process.
What are the advantages of LED illumination?
Long operating life, efficient operation, reduced lamp replacement, consistent illumination, rapid switching, compact construction and reduced maintenance. The LED modules, optical system, power supply and sign face should be engineered as one assembly, and sign luminance should follow the airfield brightness-step settings so signs stay balanced with adjacent taxiway lights.
Do airfield signs have to be frangible?
Yes. ICAO Annex 14 requires signs on the movement area to be frangible, and those near a runway or taxiway to be low enough to preserve clearance for propellers and engine pods. Review the sign enclosure, support posts, base assemblies, fasteners, breakaway components, foundations and sign height against the applicable requirements.
How are illuminated signs powered?
Illuminated signs can be supplied from a series circuit (constant-current, via isolating transformer) or a parallel (constant-voltage) circuit. Coordinate input voltage or current, power consumption, local switching or central control, dimming and brightness steps, surge protection, earthing and bonding with the airport infrastructure, and verify the electrical interface specifically before connecting to an existing airfield lighting system.
What are common sign problems?
Reduced visibility from a dirty face, damaged legend or poor positioning, uneven illumination from LED module or power-supply faults, an outdated or incorrect legend, physical damage from vehicles or ground-support equipment, faded colour or reduced contrast from UV ageing, and corrosion. Check the displayed information against the latest approved airport signage schedule.
Which standards apply to WGS sign boards?
References include ICAO Annex 14 Volume I (signs, Chapter 5, Appendices 1 and 4), ICAO Doc 9157 Part 4, FAA AC 150/5345-44L (runway and taxiway signs) and AC 150/5340-18H (airport sign systems), DGCA India CAR Section 4, and the approved airport signage schedules and project specifications. Verify the applicable edition before manufacture and installation.
Is it safe to work on a sign fed from a series circuit while it is energised?
No. Never open a live series circuit: an open series circuit driven by a constant-current regulator can produce dangerously high voltage. De-energise at the regulator, apply lock-out / tag-out, use the series circuit cut-out switch or an approved isolation device and work under the permit-to-work system. See the electrical safety warning on this page.
What should I provide when requesting WGS sign boards?
Provide the airport and project name, sign category, exact legend, quantity, character height, board dimensions, viewing distance, illumination requirement, electrical supply and control requirement, mounting arrangement, foundation information, frangibility requirement, environmental conditions, applicable airport standard and required documentation.
Why Choose Precision AGL Solutions
An Integrated Visual Guidance Approach
Precision AGL Solutions supports WGS sign boards as part of an integrated airport visual guidance approach. Our support can include:
- Sign-board selection
- Legend coordination
- Character configuration
- Board-size selection
- LED illumination options
- Electrical interface review
- Mounting recommendations
- Replacement and retrofit support
- Technical documentation
- Coordination with airport lighting and signage systems
This approach helps ensure that the sign board is suitable for the intended operational environment and compatible with the wider movement-area guidance system.
Procurement Information for Indian Projects
Indian public tenders commonly ask for the documents below. State which ones your tender requires when you send the enquiry, so they are covered in the quotation.
- Manufacturer / OEM authorisation
- Country of origin and local-content declaration (for Make in India purchase preference)
- Type-test and routine-test certificates, and the FAA / ICAO / IEC compliance documents named in the specification
- Datasheets, drawings and installation instructions
- Warranty, delivery period and spares support
- GeM catalogue or tender-portal requirements, where applicable
Request WGS Sign Board Specification
Need WGS sign boards for a taxiway, apron, holding position, stand, runway entrance or airport infrastructure project? Send us the sign category, approved legend, quantity, character height, viewing distance, board dimensions, illumination requirement, electrical supply, mounting arrangement and applicable airport standard. Our team can help determine the appropriate WGS sign-board configuration and provide the technical documentation required for procurement, approval and installation.
- Emailprecisionaglsolutions@gmail.com
- Websiterahulsharmaagl.in
- LinkedInPrecision AGL Solutions
- Phone+91 98214 96412
Engineering Note
WGS sign boards should be designed and installed according to the applicable aerodrome signage requirements, airport layout, operational conditions, aircraft and vehicle clearance criteria, electrical infrastructure and approved project documentation.
Exact board dimensions, character configuration, luminance, illumination, electrical characteristics, environmental protection, mounting and frangibility requirements are project-dependent. Sign colour and inscription are not: they follow the sign category defined in the applicable standard. Verify all of these against the current applicable standard and engineering specification.
Product Disclaimer
Product availability, configuration, dimensions, electrical characteristics, photometric performance, certifications and compliance status depend on the selected manufacturer and project specification. The technical values published on this page should not be treated as a substitute for the manufacturer's current approved Technical Data Sheet.
Final selection shall be based on the approved project specification, applicable aviation standards, authority requirements, manufacturer documentation and site conditions. Use of this page is also subject to the Legal Notice, Disclaimer & Terms of Use.
Standards and editions referenced on this site are listed on the Standards Reference page.