Internally Illuminated Windsock
A fabric wind cone with an integrated light source inside the mast that illuminates the cone from within, providing clear visibility of wind direction and speed at night. Ideal for airfields where external floodlights are impractical or where unobtrusive lighting is preferred.
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What Is It?
An Internally Illuminated Windsock is a wind cone assembly where the light source is mounted inside the mast, shining upward into the fabric cone to illuminate it from within. This design provides even, glare‑free illumination of the entire windsock, making it highly visible to pilots at night without spilling light into the surrounding area. The internal light is typically a high‑intensity LED or halogen lamp housed in a sealed, weatherproof enclosure within the mast. The cone fabric is selected for its translucency to allow light to pass through while maintaining its structural integrity and wind‑response characteristics. This type of illumination is preferred at airfields where external floodlights would cause glare, create shadows, or be aesthetically intrusive.
Purpose & Function
Internal illumination exists to solve a specific problem external floodlighting can create: glare and light spill that either wash out the windsock's own visual pattern or intrude on surrounding areas, aircraft, or nearby communities. By lighting the cone from within, the fabric itself becomes the light source pilots see, giving a clean, evenly lit shape that's easy to read against a dark sky without the shadows or hot spots external lighting can introduce.
This matters most at locations where light discipline is a real operational concern — near residential areas, sensitive terrain, or airfields where excess ground lighting could interfere with a pilot's night vision during approach — letting the airfield keep the windsock fully visible for wind reference without adding unwanted light to the surrounding environment.
Where Is It Used?
Used at airfields, heliports, and military landing zones that require 24/7 wind information without external floodlighting. Particularly common at smaller airfields, helipads, offshore platforms, and urban heliports where light pollution is a concern. Also used at fire stations and emergency helipads where a compact, self‑contained illumination system is needed. The internal illumination design is also preferred in environments with extreme weather (snow, ice) where external floodlights may be damaged or obscured.
Installation & Location
The light source is housed inside the mast head or a hoist-frame fitting at the top of the mast, shining outward through the translucent sock fabric, so the fixture and its wiring are integrated into the mast structure rather than mounted separately at ground level. Power cabling runs up through the mast in a protected conduit to the head fitting, with a weatherproof junction at the base connecting back to underground supply cable. Because the lamp or LED module sits at the top of the mast, it must be accessible for maintenance via a hinged or lowering mast head, a lightweight hoist, or an elevated platform, and any frangible coupling fitted to the mast is positioned below the lowest point of routine access so break-away function is preserved. Siting follows the same visibility and clearance requirements as the wind cone mast itself, since the two are installed as a single assembly.
How Does It Work?
The internally illuminated windsock consists of a hollow mast with a lamp or LED module mounted near the top. The light is directed upward into the cone, which is made from a translucent fabric (e.g., UV‑stabilized polyester with special light‑diffusing properties). The cone material allows light to pass through evenly, illuminating the entire cone without creating hot spots. The lamp is controlled by a photocell or timer, switching on at dusk and off at dawn. An optional manual override is often provided. The mast also contains the wiring and a junction box for connection to the airfield's power supply. The swivel bearing at the top allows the cone to rotate freely with the wind, and the light source is designed to minimize shadowing while providing uniform illumination.
System Architecture & Control Logic
Control is simpler here than for the external design because there is only one fixture to switch rather than a group of ground-level floodlights: a photocell or timer at the mast base (or in the local distribution cabinet) energises the single lamp or LED module at dusk and switches it off at dawn, with a manual override provided for maintenance and testing. Like the externally illuminated version, this circuit sits outside the CCR series loop that runs the runway and taxiway visual aids — it's a standard AC feed run up through the mast to the head fitting, not a current-stepped series circuit, so there is no intensity-step selection tied to visibility category. The trade-off for this simpler electrical picture is fault visibility: because the lamp sits at the top of an enclosed mast rather than at ground level, a failure is only obvious as "the sock has gone dark" unless the circuit's on/off and (where fitted) lamp-status signal is wired back to the ALCMS or local panel as a monitored point.
Glowing From Within
Light passes through the cone material itself rather than bouncing off its surface, so the whole cone glows evenly with no hot spots and no light spilling outward.
The sealed, weatherproof lamp housing sits inside the mast rather than at ground level, which is why access for maintenance is harder than on an Externally Illuminated Windsock — the payoff is glare-free, self-contained illumination that works well at urban heliports and light-pollution-sensitive sites.
Physical Construction
This configuration houses the light source inside the mast itself, shining upward through the open throat of the cone so the fabric glows from within rather than being lit externally. The lamp or LED array sits in a sealed, weatherproof fixture near the top of the mast, just below the swivel bearing, connected by wiring routed through the mast's hollow interior down to a base-mounted power supply and control gear, keeping all electrical connections protected from weather and physical damage. Because the illumination depends on light passing through the fabric, the cone material is a translucent, UV-stabilised polyester rather than the opaque fabric used on externally lit designs, selected to diffuse light evenly along the cone's length while retaining the tear strength and flame-retardant properties required for continuous outdoor service. The mast is typically powder-coated aluminium or galvanized steel, bored or fitted with an internal conduit to carry the lamp wiring, and the swivel bearing at the top is a sealed, low-friction unit that also serves as the mechanical and electrical interface between the fixed mast wiring and the rotating cone assembly.
Technical Parameters
| Parameter | Typical Value |
|---|---|
| Light Source | LED array (20–50 W) or compact fluorescent/halogen |
| Luminous Output | 1,000–3,000 lumens (depending on cone size) |
| Colour Temperature | 4,000–5,000 K (neutral white for colour rendering) |
| Cone Material | Translucent, UV‑stabilized polyester (flame‑retardant) |
| Cone Dimensions (ICAO) | Truncated cone at least 3.6 m long with a throat diameter of at least 0.9 m, proportioned so it extends fully in a wind of about 15 kt and indicates direction clearly at 6 kt |
| Siting (ICAO) | At least one indicator, visible from aircraft in flight and from the movement area, sited clear of turbulence from nearby buildings or terrain and marked by a circle 15 m in diameter where practicable |
| Night Illumination | At least one wind direction indicator must be illuminated at an aerodrome intended for use at night |
| Cone Colour | Orange and white bands (or solid orange) |
| Mast Material | Powder‑coated aluminium or galvanized steel |
| Protection Class | IP66 / IP67 (sealed light housing) |
| Power Supply | 230V AC or 24V DC (with converter) |
| Control | Photocell, timer, or manual switch |
Electrical Requirements
| Requirement | Typical Value |
|---|---|
| Circuit Type | Local mains branch circuit (230V AC) or low-voltage 24V DC via step-down converter; not part of the runway series (CCR) circuit |
| Swivel/Rotating Connection | Slip-ring assembly or coiled service loop maintains the power feed to the light as the cone frame rotates with wind |
| Cable Type | Flexible weatherproof cable rated for the swivel/rotation duty cycle |
| Circuit Protection | MCB and RCD (residual current device) at the local distribution point |
| Control Wiring | Photocell, astronomical timer, or manual switch wired into the lighting circuit |
| Earthing/Grounding | Light housing and mast bonded to site earth |
| Insulation Resistance | ≥ 1 MΩ (mains circuit megger test) |
| Standby/Backup | Optional battery backup or connection to airfield emergency supply for critical sites |
Photometric Requirements
| Parameter | Typical Value |
|---|---|
| Cone Luminance (as seen from outside) | Average luminance 34–103 cd/m² (10–30 foot-lamberts) per FAA AC 150/5345-27 Style I-B, measured along the fully extended cone |
| Minimum Point Luminance | No point below the specified 10–30 fL (34–103 cd/m²) average band, measured at 1-foot intervals and 45° increments around the cone circumference per AC 150/5345-27 |
| Uniformity Ratio | Max/min luminance ≤ 4:1 along the cone length, front to tail |
| Internal Light Placement | Source centred at the cone throat, directed along the axis to illuminate the full translucent length |
| Colour Temperature | 4,000–5,000 K neutral white, sufficient to distinguish orange and white bands at night |
| Colour Rendering | CRI ≥ 70 through the fabric |
| Visibility Distance | Cone orientation and colour bands discernible from the aerodrome traffic pattern/circuit at night |
| Maintenance Factor | ≥ 50% of commissioned luminance before lamp cleaning/replacement is due |
| Test Method | Luminance meter at multiple points on the cone surface, taken after dark with the cone in normal orientation |
Applicable Standards
ICAO Annex 14, Vol I — 5.1.1
Wind direction indicator: provision, location, cone dimensions and colour, and the requirement for illumination at an aerodrome intended for use at night
ICAO Doc 9157 Part 4
Aerodrome Design Manual, Visual Aids — wind direction indicator siting and marker circle guidance
FAA AC 150/5345-27
Specification for Wind Cone Assemblies — Style I-B (internally lighted) luminance test method and 10–30 fL requirement
Local electrical/building code
Governs the AC branch circuit, MCB/RCD protection, and earthing, since the lamp circuit is a standard mains installation rather than the AGL constant-current series circuit
Note on figures: the values on this page are typical reference figures drawn from the standards listed above and from manufacturers’ published data. Requirements differ between ICAO, FAA and national regimes, and between aerodrome code numbers, approach categories and equipment types. Always design, install, commission and maintain to the project specification, the manufacturer’s manual and the standard in force at the aerodrome.
Installation Requirements
Mast Foundation & Frangible Coupling
CivilSet the mast foundation and, where the site falls within a frangibility-sensitive area, fit the breakaway coupling below the lowest point of routine access.
Internal Conduit Wiring
ElectricalRoute power cabling up through the mast's protected internal conduit to the head fitting, keeping wiring shielded from weather and mechanical damage.
Base Junction Termination
ElectricalTerminate the weatherproof junction at the mast base connecting the internal head wiring back to the underground supply cable.
Swivel Bearing & Head Fitting Assembly
MechanicalFit the sealed swivel bearing at the mast head so it serves as both the mechanical and electrical interface between the fixed mast wiring and the rotating cone assembly.
Translucent Cone Fitting
MechanicalFit the translucent, UV-stabilised cone fabric to the throat ring so it diffuses light evenly along its length once illuminated.
Maintenance Access Provision
MechanicalConfirm the hinged or lowering mast head, hoist, or elevated platform is in place so the lamp fixture can be reached for maintenance.
Photocell/Timer Control Wiring
ElectricalWire the lamp circuit through its photocell, timer, or manual switch at the base-mounted power supply and control gear.
Pre-Energisation Sign-off
DocumentationRecord mast position, internal wiring route, and head fitting assembly as-built before the installation is accepted for commissioning.
Testing & Commissioning
Insulation Resistance Test
Pre-EnergisationMegger-test the lamp/LED circuit and supply cabling before the installation is energised, confirming insulation resistance clears the acceptable minimum.
Lamp/LED Circuit Continuity Test
Pre-EnergisationVerify continuity of the internal wiring from the junction box to the lamp module end to end before first energisation.
Photocell/Timer Function Test
EnergisationConfirm the photocell or timer switches the internal lamp on at dusk and off at dawn, or override correctly if manually triggered.
Internal Illumination Uniformity Test
Functional TestConfirm the light source illuminates the cone evenly without hot spots or shadowing, checking output at the throat and tail of the cone.
Swivel Bearing Free-Rotation Check
Functional TestConfirm the cone rotates freely on the swivel bearing and aligns correctly with wind direction without binding or drag.
Junction Box & Wiring Inspection
Pre-EnergisationInspect the junction box and mast wiring for correct termination, sealing, and strain relief before the site is finally closed out.
Photometric Intensity Test
Final AcceptanceMeasure light output through the cone fabric with a calibrated light meter against ICAO/FAA commissioning tolerances.
Documentation & As-Built Sign-off
Final AcceptanceRecord insulation, continuity, and photometric readings alongside as-built position in the commissioning dossier for handover.
Inspection & Maintenance
Internal Light Function & Colour Check
Semi-annualConfirm the internal LED or lamp still illuminates evenly and colour temperature stays within the neutral-white 4,000–5,000K range needed for the cone to render its orange/white bands correctly.
Cone Translucency & Condition Inspection
QuarterlyCheck the cone fabric for fading, tears, or fraying, and confirm it stays sufficiently translucent for the internal light to remain visible after dark.
Photocell / Timer Control Verification
Semi-annualTest the control method (photocell, timer, or manual switch) to confirm the internal light activates and deactivates at the correct times.
Swivel Bearing Lubrication & Function Check
Semi-annualLubricate the swivel bearing and confirm free rotation, since a stiff bearing gives a false wind direction reading.
Light Housing Seal Inspection
AnnualCheck the sealed light housing gaskets for cracking or degradation and confirm the IP66/IP67 rating is still intact against moisture ingress inside the mast.
Mast Interior Conduit & Wiring Check
AnnualInspect wiring routed through the hollow mast for chafing, corrosion, or moisture pooling, since this run is hidden from casual visual inspection.
Cable & Power Connection Inspection
AnnualExamine supply wiring and connectors at the base of the mast for corrosion or loose terminations, a common cause of intermittent light failure.
Mounting & Structural Attachment Check
AnnualInspect the mast base and cone attachment points for corrosion, loosening, or fatigue from wind loading.
Common Field Issues
Lamp/LED Failure
The internal light source can fail, leaving the windsock unilluminated at night. Regular replacement and spare lamp availability are essential. LED modules typically last 50,000+ hours but should be tested periodically.
Moisture Ingress in Mast
Water can enter the mast through the light housing or cable entry, causing short circuits and corrosion. Regular inspection of seals and gaskets, and use of IP66/IP67 rated enclosures is critical.
Cone Fabric Translucency Degradation
UV exposure can cause the cone fabric to become opaque or discoloured, reducing internal light transmission. Regular cone replacement (every 2–3 years) is needed to maintain illumination quality.
Troubleshooting Guide
Sock Goes Completely Dark at Night
Sock Visible But Dim or Unevenly Lit
Fault Not Detected Until Reported as "Sock Gone Dark"
Water Ingress at Mast Head or Base Junction
Swivel Bearing Binding or Sock Not Rotating Freely
Frangible Coupling or Mast Access Mechanism Fault
Failure Modes & Root Causes
Lamp/LED Module Failure
Swivel Bearing / Electrical Interface Failure
Mast Wiring Open Circuit
Cone Fabric Translucency Degradation
Seal or Gasket Failure (Moisture Ingress)
Frangible Coupling / Access Mechanism Fault
Safety & Operational Notes
Electrical Isolation
Electrical SafetyDe-energise and lock out the internal light source supply and verify zero energy before opening the mast-top enclosure or removing the fabric cone.
Mast-Top Access
Fall ProtectionThe light source and its sealed enclosure sit inside the mast at the top; use fall-protection equipment and, where fitted, a lowering mechanism rather than free-climbing the mast.
Hot Lamp Handling
Personnel SafetyAllow the internal lamp to cool before handling; a sealed enclosure retains heat longer than an open external floodlight.
Enclosure Reseal
MechanicalReinstate the weatherproof seal on the mast-top enclosure correctly after any lamp or fabric work; a compromised seal at height is difficult to detect until moisture ingress causes a fault.
Airside Work Coordination
OperationalCoordinate with ATC/airside operations before servicing a windsock relied on for night wind indication.
PPE
Personnel SafetyUse insulated tools for internal electrical connections and fall-protection PPE appropriate to the mast height.
Restore to Compliant State
ComplianceConfirm even, glare-free illumination through the fabric and a properly resealed enclosure before closing out the work.
Engineering & Expert Notes
Track Cone Replacement by Fabric Condition, Not Just a Calendar
DurabilityUV degradation of the translucent fabric varies significantly with local sun exposure and altitude, so a fixed 2–3 year replacement interval is only a starting point. Check actual light transmission at night during routine visits and shorten the interval for masts at high-UV sites rather than waiting for a fixed date if the fabric is visibly going opaque sooner.
Internal Heat Buildup Shortens LED Life
ThermalAn internally illuminated windsock encloses its light source inside a fabric cone with limited airflow, so heat dissipation is worse than for an open floodlight fixture. Specify LED modules with adequate thermal derating margin for the enclosed environment, and don't assume a floodlight-rated LED module will perform the same way sealed inside the mast head.
Condensation Inside the Mast is the Most Common Silent Fault
ElectricalBecause the light source and wiring sit inside the enclosed mast, moisture that gets past the head seal has nowhere to evaporate and instead condenses repeatedly on the internal wiring and connections. Verify breathing/drainage provisions at the base and mast head, not just the main head seal, since a mast that seals but can't equalise pressure will trap condensation over time.
Uniformity, Not Just "Is It Lit," Is the Real Test
CommissioningAn internally illuminated sock can appear lit from the ground while actually showing a bright patch near the light source and a dim, hard-to-read tip, especially as the fabric ages unevenly. Verify illumination uniformity along the full cone length at night, not just confirm the light source is powered.
Design for Maintenance Access Before You Need It
DesignInternal lamp/LED replacement without a proper access provision at the mast head or a lowering mechanism turns a routine bulb change into a specialised, weather-dependent task. Confirm the maintenance access method at design stage, since retrofitting access onto an already-installed mast is far more disruptive than specifying it up front.
Swivel Bearing Wear Also Threatens the Electrical Path
MechanicalOn internally lit socks, the swivel bearing usually carries the power feed through to the light source, so mechanical wear here isn't purely a rotation problem — a binding or worn bearing can also stress or intermittently break the electrical connection. Treat swivel bearing inspection as an electrical reliability check, not just a mechanical free-rotation check.
Frequently Asked Questions
Short answers about the Internally Illuminated Windsock: what it is, how it works, typical specifications, standards, maintenance and common faults.
Q1What is an Internally Illuminated Windsock?
An Internally Illuminated Windsock is a wind cone assembly where the light source is mounted inside the mast, shining upward into the fabric cone to illuminate it from within. This design provides even, glare‑free illumination of the entire windsock, making it highly visible to pilots at night without spilling light into the surrounding area. The internal light is typically a high‑intensity LED or halogen lamp housed in a sealed, weatherproof enclosure within the mast.
Q2What is the purpose of an Internally Illuminated Windsock?
Internal illumination exists to solve a specific problem external floodlighting can create: glare and light spill that either wash out the windsock's own visual pattern or intrude on surrounding areas, aircraft, or nearby communities. By lighting the cone from within, the fabric itself becomes the light source pilots see, giving a clean, evenly lit shape that's easy to read against a dark sky without the shadows or hot spots external lighting can introduce.
Q3Where is an Internally Illuminated Windsock used and installed?
Used at airfields, heliports, and military landing zones that require 24/7 wind information without external floodlighting. Particularly common at smaller airfields, helipads, offshore platforms, and urban heliports where light pollution is a concern. Also used at fire stations and emergency helipads where a compact, self‑contained illumination system is needed. The internal illumination design is also preferred in environments with extreme weather (snow, ice) where external floodlights may be damaged or obscured.
Q4How does an Internally Illuminated Windsock work?
The internally illuminated windsock consists of a hollow mast with a lamp or LED module mounted near the top. The light is directed upward into the cone, which is made from a translucent fabric (e.g., UV‑stabilized polyester with special light‑diffusing properties). The cone material allows light to pass through evenly, illuminating the entire cone without creating hot spots. The lamp is controlled by a photocell or timer, switching on at dusk and off at dawn. An optional manual override is often provided.
Q5What are the typical technical parameters of an Internally Illuminated Windsock?
Typical values are — Light Source: LED array (20–50 W) or compact fluorescent/halogen; Luminous Output: 1,000–3,000 lumens (depending on cone size); Colour Temperature: 4,000–5,000 K (neutral white for colour rendering); Cone Material: Translucent, UV‑stabilized polyester (flame‑retardant); Cone Dimensions (ICAO): Truncated cone at least 3.6 m long with a throat diameter of at least 0.9 m, proportioned so it extends fully in a wind of about 15 kt and indicates direction clearly at 6 kt.
Q6What are the electrical requirements for an Internally Illuminated Windsock?
Typical requirements are — Circuit Type: Local mains branch circuit (230V AC) or low-voltage 24V DC via step-down converter; not part of the runway series (CCR) circuit; Swivel/Rotating Connection: Slip-ring assembly or coiled service loop maintains the power feed to the light as the cone frame rotates with wind; Cable Type: Flexible weatherproof cable rated for the swivel/rotation duty cycle; Circuit Protection: MCB and RCD (residual current device) at the local distribution point; Control Wiring: Photocell, astronomical timer, or manual switch wired into the lighting circuit; Earthing/Grounding: Light housing and mast bonded to site earth.
Q7What photometric requirements apply to an Internally Illuminated Windsock?
Typical requirements are — Cone Luminance (as seen from outside): Average luminance 34–103 cd/m² (10–30 foot-lamberts) per FAA AC 150/5345-27 Style I-B, measured along the fully extended cone; Minimum Point Luminance: No point below the specified 10–30 fL (34–103 cd/m²) average band, measured at 1-foot intervals and 45° increments around the cone circumference per AC 150/5345-27; Uniformity Ratio: Max/min luminance ≤ 4:1 along the cone length, front to tail; Internal Light Placement: Source centred at the cone throat, directed along the axis to illuminate the full translucent length.
Q8Which standards apply to an Internally Illuminated Windsock?
The main references are ICAO Annex 14, Vol I — 5.1.1 — Wind direction indicator: provision, location, cone dimensions and colour, and the requirement for illumination at an aerodrome intended for use at night; ICAO Doc 9157 Part 4 — Aerodrome Design Manual, Visual Aids — wind direction indicator siting and marker circle guidance; FAA AC 150/5345-27 — Specification for Wind Cone Assemblies — Style I-B (internally lighted) luminance test method and 10–30 fL requirement; Local electrical/building code — Governs the AC branch circuit, MCB/RCD protection, and earthing, since the lamp circuit is a standard mains installation rather than the AGL constant-current series circuit. Always verify the current edition and your aerodrome's approved requirements.
Q9How often should an Internally Illuminated Windsock be inspected and maintained?
Typical maintenance tasks and intervals are: Internal Light Function & Colour Check (semi-annual); Cone Translucency & Condition Inspection (quarterly); Photocell / Timer Control Verification (semi-annual); Swivel Bearing Lubrication & Function Check (semi-annual); Light Housing Seal Inspection (annual); Mast Interior Conduit & Wiring Check (annual); Cable & Power Connection Inspection (annual); Mounting & Structural Attachment Check (annual). Your airport's approved maintenance programme takes precedence.
Q10How do I troubleshoot common Internally Illuminated Windsock faults?
Common symptoms covered are: Sock Goes Completely Dark at Night; Sock Visible But Dim or Unevenly Lit; Fault Not Detected Until Reported as "Sock Gone Dark"; Water Ingress at Mast Head or Base Junction; Swivel Bearing Binding or Sock Not Rotating Freely; Frangible Coupling or Mast Access Mechanism Fault. For example, for "Sock Goes Completely Dark at Night": Likely Cause: Failed lamp/LED module at the top of the mast, a failed photocell or timer, or an open circuit in the wiring run up through the mast — with only one fixture in this design, any of these presents the same way: total darkness. Diagnostic Steps: Use the manual override at the mast base to test the circuit independently of the photocell/timer; check supply voltage at the base junction box; if the lamp doesn't respond to manual override with voltage confirmed present, the fault is upstream in the mast wiring or the lamp itself. Corrective Action: Replace the photocell/timer if voltage isn't reaching the base circuit, or access the mast head via its hinged/lowering mechanism or hoist to replace the lamp/LED module; repair any open circuit found in the mast wiring run.
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