Airfield Signs
Airfield Information Sign for Movement Areas
Operational and situational information where it is needed
Information signs provide operational, navigational and situational information beyond basic location, direction or mandatory instructions, configured around your signage plan, legend, visibility, illumination and mounting requirements.
Supplied by Precision AGL Solutions
Product Overview
Airfield Information Sign
What It Is
Information signs give aircraft crews, vehicle operators and ground personnel operational, navigational and situational information where more than location, direction or mandatory instructions is needed.
Precision AGL Solutions supplies information signs designed around the airport signage plan, operational requirements, legend, visibility, illumination, mounting and regulatory framework, externally or internally illuminated, as part of a coordinated signage package.
Four Main Elements
- Legend — text, abbreviation, symbol or information
- Sign face — background and contrasting legend
- Illumination — internal or external where required
- Mounting structure — support, fixing and installation interface
Applications
Where Information Signs Are Used
Taxiway information pointsConcise visual communication on taxiway systems.
Apron & stand areasStand and apron-related information.
Service roadsVehicle operating areas.
Maintenance & operational zonesGround-service and operational areas.
Complex routingComplex taxiway or apron environments.
Replacement & modernizationExisting signage replacement and airfield upgrades.
Also infrastructure identification, and supplemental information alongside location or direction signs. Consider the application together with the movement-area layout and the intended operator.
Information vs Other Signs
Distinguishing Airfield Sign Categories
| Sign Type | Primary Function |
|---|---|
| Location Sign | Identifies the taxiway, runway or movement-area location where the aircraft or vehicle is positioned |
| Direction Sign | Provides routing information toward one or more destinations |
| Mandatory Instruction Sign | Communicates an instruction or restriction that must be observed |
| Other Information Signs | Destination, runway exit / vacated, intersection take-off and apron or stand information |
Legend, colour scheme, location and visibility should match the sign's intended operational function. Under ICAO Annex 14, location, direction and destination signs are all classed as information signs; mandatory instruction signs are a separate category.
Legend & Information Content
Taken From the Approved Signage Layout
The Sign May Incorporate
- Text, abbreviations, operational identifiers
- Symbols and directional information
- Supplemental, stand or apron-related information
- Service or operational references
Do not select the legend solely from available sign sizes.
Precision AGL Can Work From
- Airport signage and sign schedules
- CAD and airfield layout drawings
- Tender specifications
- Approved legends
- Project-specific signage standards
Character Height & Dimensions
Engineered Rather Than Generic
Character Height Factors
- Maximum viewing distance
- Cockpit and vehicle-operator viewing height
- Taxiway or apron geometry
- Ambient lighting, required recognition time
- Sign dimensions, regulatory requirements
Provide sufficient recognition without unnecessarily large structures; confirm during engineering.
Overall Dimensions Depend On
- Legend length and number of lines
- Character height, symbols or arrows
- Border requirements
- Internal illumination arrangement
- Mounting configuration, viewing distance, available space
Multi-line signs must stay legible without compromising the signage hierarchy.
Colour & Luminance
Contrast and Visibility
Colour and Contrast
Select the colour scheme for the sign's intended function and the applicable regulations. High legend/background contrast is essential by day and night. Direction, destination, runway exit, runway vacated and intersection take-off signs use a black legend on a yellow background (FAA type L-858Y); location signs, also an information category under ICAO, are yellow on black, and mandatory instruction signs are white on red. Colour must meet the chromaticity and luminance limits of the applicable standard.
- Background, legend and border colour
- Daytime and night-time appearance
- Illumination effects, ambient airport lighting, viewing direction
Information signs must be distinguishable from mandatory, location and direction signs.
Luminance and Visibility
- Daytime and night-time readability
- Uniformity across the sign face
- Legend/background contrast, viewing angle
- Light-source stability, internal reflections
- Long-term optical performance
Avoid excessive glare while maintaining contrast.
Illuminated Signs & LED
Night and Reduced-Light Visibility
Illumination May Be Provided By
- Internal LED illumination
- External sign-face illumination
- Project-specific illuminated modules
- Controlled airport lighting circuits
Select according to construction, legend, required luminance, electrical architecture and project specification. Annex 14 requires illuminated signs in runway visual range below 800 m, at night with instrument runways, and at night with non-instrument runways of code number 3 or 4; otherwise a retroreflective sign may be acceptable. External illumination must still achieve the luminance, uniformity and colour required by Annex 14 Appendix 4; FAA L-858 signs are internally illuminated.
LED Construction
- Long life, reduced lamp replacement
- Efficient operation, consistent illumination
- Rapid switching, reduced maintenance
- Compatible with modern airfield electrical systems
Select LED modules, power supplies, optics and wiring as an integrated system.
Electrical Configuration
Interface With Site Infrastructure
Project Considerations
- Supply voltage, AC or DC architecture
- Internal LED power supply
- Series (constant-current) circuit through an isolating transformer, or parallel (constant-voltage) circuit
- Sign brightness following the airfield brightness steps
- Dedicated sign circuits
Also Review
- Control and switching requirements
- Surge protection, earthing and bonding
- Cable entry arrangement
- Maintenance isolation
Review the interface before procurement where integrating into an existing airfield lighting network.
Construction
Built for Outdoor Airfield Conditions
Construction Considerations
- Corrosion-resistant materials
- Weather-resistant enclosure, UV-resistant finishes
- Sealed electrical compartments
- Robust sign face, serviceable internals
- Secure cable entry, drainage where required
- Resistance to vibration and environmental exposure
Environmental Exposure
- Rain, dust, high humidity
- UV radiation, temperature variation, wind
- Corrosive environments, cleaning chemicals
- Continuous vibration
Coastal or highly corrosive sites may need additional material and finish considerations.
Mounting, Installation & Frangibility
Support and Airfield Safety
Mounting Options
- Single- or multi-post mounting
- Ground-mounted structures, project-specific frames
- Frangible supports where required
- Adjustable hardware, dedicated foundations
- Cable-entry interfaces
Coordinate height and position with aircraft clearance, vehicle access, pavement geometry, sightlines and the approved layout.
Frangibility
Evaluate the complete installation against applicable airfield safety requirements:
- Sign enclosure, support posts, base assemblies
- Fasteners, foundations
- Breakaway or frangible interfaces, cable routing
Signs on the movement area must be frangible and low enough to clear propellers and engine pods. Requirements are project- and location-dependent; confirm against the airport design standard.
Technical Data
Typical Project Considerations
| Parameter | Typical Project Consideration |
|---|---|
| Product type | Airfield information sign |
| Legend | Project-specific |
| Character height | Project-specific / standard requirement |
| Sign dimensions | Based on legend and viewing distance |
| Background and legend colour | Information sign: black legend on yellow background; other categories per sign category |
| Luminance | Project / standard requirement |
| Illumination and light source | Internal LED or external, as specified; LED where applicable |
| Electrical supply | Project-specific |
| Control | Local, circuit, or airport lighting control |
| Construction | Weather- and corrosion-resistant |
| Mounting | Ground-mounted / project-specific |
| Frangibility | Where required by installation location |
| Cable entry | Project-specific |
| Environmental protection | Suitable for outdoor airfield installation |
| Maintenance access | Serviceable construction |
Confirm exact dimensions, luminance, electrical characteristics, environmental ratings and mounting details against the product datasheet and project specification.
Information Sign Selection
Start With the Information to Be Communicated
Confirm legendExact wording, symbol or information
Viewing environmentPosition, distance, geometry, day/night
Character heightPer standard and viewing conditions
Sign dimensionsLegend, symbols, borders, illumination
IlluminationInternal or external lighting
MountingPavement, clearances, foundation, frangibility, cable route
Electrical compatibilityExisting signage / lighting infrastructure
Installation Considerations
Review Before Installation
- Approved sign location
- Sign orientation, legend direction
- Character height, mounting height
- Pavement, aircraft and vehicle clearance
- Foundation arrangement, cable routing
- Electrical connection, earthing and bonding
- Frangibility requirements
- Final sightline
Orientation is critical: a correctly manufactured sign can still give incorrect guidance if installed facing the wrong traffic flow.
Coordination With Airfield Markings
A Consistent Visual Guidance Environment
- Taxiway centreline and edge markings
- Holding-position and stand markings
- Direction, location and mandatory instruction signs
- Apron guidance systems
- Ground vehicle routes
Treat signs as part of the system, not isolated items.
Commissioning
Confirm Against the Approved Signage Plan
- Correct legend, orientation and position
- Character visibility
- Illumination operation and uniformity
- Electrical connections, cable integrity
- Mounting security, structural condition
- Visibility from the intended approach direction
For illuminated signs, a night-time inspection is particularly useful for confirming optical performance.
Maintenance
Routine Inspection
Activities
- Cleaning sign faces
- Inspecting enclosure seals and mounting hardware
- Inspecting support structures, cable entries
- Checking electrical connections, LED modules, power supplies
- Verifying illumination uniformity, corrosion, sign-face condition
Why It Matters
Assess damaged or faded sign faces promptly: degraded contrast reduces the effectiveness of movement-area information.
Common Issues
Typical Problems and Causes
| Issue | Possible Causes |
|---|---|
| Poor visibility | Dirty sign face, insufficient illumination, optical degradation, incorrect viewing angle, excessive ambient light |
| Uneven illumination | LED module failure, power-supply problems, internal optical degradation, damaged diffuser or sign face |
| Incorrect orientation | A correctly manufactured sign installed toward the wrong traffic direction |
| Corrosion | Moisture ingress, damaged coatings, unsuitable materials, harsh environment |
| Electrical failure | Power-supply failure, cable damage, loose connections, circuit faults, surge-related damage |
Procurement Checklist
When Requesting a Sign, Provide
- Sign legend
- Airport project / location
- Sign category
- Character height
- Required dimensions, if specified
- Illumination requirement
- Electrical supply
- Mounting arrangement
- Foundation information
- Frangibility requirement
- Environmental conditions
- Applicable airport standard
- Quantity
- Required documentation
This lets the sign be engineered around the actual operational requirement rather than a generic configuration.
Standards & References
Verify the Applicable Edition
Depending on Airport and Jurisdiction
- ICAO Annex 14 Vol. I (Chapter 5 signs; Appendices 1 and 4) and Doc 9157 Part 4
- FAA AC 150/5345-44L (sign specification) and AC 150/5340-18H (sign systems), where FAA standards apply
- DGCA India CAR Section 4 — Aerodrome Standards
- Airport-specific design standards
- Project tender specifications and approved signage drawings
Verify Before Manufacture
Sign category, colour, legend format, character height, illumination, mounting and frangibility requirements should be verified against the current applicable standard.
Documentation & Why Precision AGL
Part of the Complete Guidance System
Documentation Support
- Product datasheets, technical specifications
- Sign schedules, GA drawings, sign-face layouts
- Mounting details, electrical information
- Installation guidance, O&M information
- Inspection documentation, technical submittals
Coordinated with the airport's procurement and engineering requirements.
Why Precision AGL Solutions
- Project-specific sign selection
- Legend and sign-face coordination
- Illuminated and LED sign configuration
- Mounting recommendations, electrical interface review
- Replacement and modernization support
- Coordination with related lighting and signage
Suitable not only as a manufactured product but as part of the airport's overall visual guidance environment.
FAQ
Airfield Information Sign — Frequently Asked Questions
What is an airfield information sign?
Information signs give aircraft crews, vehicle operators and ground personnel operational, navigational and situational information where more than location, direction or a mandatory instruction is needed. A sign has four main elements: the legend, the sign face, the illumination (internal or external where required) and the mounting structure.
How do information signs differ from location, direction and mandatory instruction signs?
A location sign identifies the taxiway, runway or movement-area location where the aircraft or vehicle is positioned, a direction sign gives routing toward one or more destinations, and a mandatory instruction sign communicates an instruction or restriction that must be observed. Other information signs cover destination, runway exit or vacated, intersection take-off, and apron or stand information. Under ICAO Annex 14, location, direction and destination signs are all classed as information signs, while mandatory instruction signs are a separate category.
What colours do information signs use?
Direction, destination, runway exit, runway vacated and intersection take-off signs use a black legend on a yellow background (FAA type L-858Y). Location signs, also an information category under ICAO, are yellow on black, and mandatory instruction signs are white on red. Colour must meet the chromaticity and luminance limits of the applicable standard.
When must an airfield sign be illuminated?
Annex 14 requires illuminated signs in runway visual range below 800 m, at night with instrument runways, and at night with non-instrument runways of code number 3 or 4; otherwise a retroreflective sign may be acceptable. External illumination must still achieve the luminance, uniformity and colour required by Annex 14 Appendix 4, and FAA L-858 signs are internally illuminated.
How is character height decided?
Character height depends on the maximum viewing distance, cockpit and vehicle-operator viewing height, taxiway or apron geometry, ambient lighting, required recognition time, sign dimensions and regulatory requirements. The aim is sufficient recognition without unnecessarily large structures, and the height should be confirmed during engineering.
What goes into the legend of an information sign?
The legend may incorporate text, abbreviations and operational identifiers, symbols and directional information, supplemental stand or apron information, and service or operational references. It is taken from the approved signage layout, and should not be selected solely from available sign sizes. Airport signage and sign schedules, CAD and airfield layout drawings, tender specifications and approved legends can all be used as the source.
How are information signs powered and controlled?
Project considerations include supply voltage, AC or DC architecture, the internal LED power supply, whether the sign runs on a series (constant-current) circuit through an isolating transformer or a parallel (constant-voltage) circuit, sign brightness following the airfield brightness steps, and dedicated sign circuits. Also review control and switching, surge protection, earthing and bonding, cable entry and maintenance isolation before integrating into an existing airfield lighting network.
How are signs mounted, and do they need to be frangible?
Mounting options include single- or multi-post mounting, ground-mounted structures, project-specific frames, adjustable hardware and dedicated foundations. Signs on the movement area must be frangible and low enough to clear propellers and engine pods. Requirements are project- and location-dependent, so confirm them against the airport design standard.
What are common problems with information signs?
Typical issues are poor visibility (dirty sign face, insufficient illumination, optical degradation, incorrect viewing angle), uneven illumination (LED module or power-supply failure, internal optical degradation, damaged diffuser), corrosion, electrical failure and incorrect orientation. Orientation is critical: a correctly manufactured sign can still give incorrect guidance if it is installed facing the wrong traffic flow.
How is an information sign commissioned and maintained?
Commissioning confirms the correct legend, orientation and position, character visibility, illumination operation and uniformity, electrical connections and cable integrity, mounting security, and visibility from the intended approach direction, with a night-time inspection particularly useful for illuminated signs. Routine maintenance covers cleaning sign faces, inspecting enclosure seals, mounting hardware, support structures and cable entries, and checking electrical connections, LED modules and power supplies. Damaged or faded sign faces should be assessed promptly because degraded contrast reduces the effectiveness of movement-area information.
Which standards apply to airfield information signs?
References include ICAO Annex 14 Vol. I (Chapter 5 signs; Appendices 1 and 4) with Doc 9157 Part 4, FAA AC 150/5345-44L (sign specification) and AC 150/5340-18H (sign systems) where FAA standards apply, DGCA India CAR Section 4, and airport-specific design standards and tender specifications. Verify the sign category, colour, legend format, character height, illumination, mounting and frangibility requirements against the current applicable standard before manufacture.
What information is needed to request an information sign?
Provide the sign legend, airport project and location, sign category, character height, required dimensions if specified, illumination requirement, electrical supply, mounting arrangement, foundation information, frangibility requirement, environmental conditions, the applicable airport standard, quantity and required documentation. This lets the sign be engineered around the actual operational requirement rather than a generic configuration.
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 an Information Sign Specification
Need an information sign for a taxiway, apron, service road or other operational area? Send the legend, character height, dimensions, illumination requirement, mounting arrangement, airport standard and project quantity. We can help determine the appropriate sign configuration and prepare technical information for procurement and installation.
- Emailprecisionaglsolutions@gmail.com
- Websiterahulsharmaagl.in
- LinkedInPrecision AGL Solutions
- Phone+91 98214 96412
Engineering Note
Airfield information signs should be designed and installed according to the applicable aerodrome signage standard, airport layout, operational requirements and approved project documentation.
Exact sign colours, character dimensions, luminance, illumination, electrical configuration, mounting and frangibility requirements are project-dependent: verify them against the current applicable standard and approved 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.