AGL Component Library By Precision AGL Academy

Mounting Ring

A precision‑machined, annular steel component that secures and aligns inset AGL light fixtures within the base can. It provides a robust, level mounting surface, ensures correct orientation of the light beam, and withstands heavy aircraft loads while allowing easy fixture removal for maintenance.

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Overview

What Is It?

A Mounting Ring (also known as a fixture ring, retaining ring, or inset ring) is a heavy‑duty, annular steel component that is installed inside the base can to secure and align an inset (flush‑mounted) AGL light fixture. It provides the primary structural interface between the fixture and the base can, ensuring that the fixture is held firmly in place, is correctly orientated (both horizontally and vertically), and can be easily removed for maintenance or replacement.

Key characteristics of mounting rings include:

Precision Machining: The ring is machined to tight tolerances to ensure accurate alignment of the fixture's optical axis with the required beam direction (e.g., towards the runway centreline).
High Strength: Made from high‑grade steel (typically hot‑dip galvanised or stainless) to withstand the heavy aircraft wheel loads (rated ≥50–100 kN vertical) that are transmitted through the fixture.
Corrosion Protection: Hot‑dip galvanised, powder‑coated, or stainless steel construction ensures long‑term resistance to the harsh airfield environment.
Integrated Features: Often includes a tapered or stepped internal profile to guide the fixture into the correct position, and threaded holes or slots for the fixture's retaining bolts.

Mounting rings are used exclusively for inset (flush‑mounted) light fixtures, including:

Runway Centreline Lights
Touchdown Zone Lights (TDZ)
Runway Edge Lights (inset versions)
Taxiway Centreline Lights
Stop Bars and Clearance Bars
Threshold and End Lights (inset versions)

The ring is installed inside the base can (or directly into the pavement) and is secured with bolts or a locking mechanism. The fixture is then inserted into the ring and locked in place, often with a bayonet‑type or bolt‑down fixing.

Purpose

Purpose & Function

An inset fixture has no pole to hold it steady — it sits flush in the pavement and takes the full weight of every aircraft wheel that rolls over it, so its mounting has to do two jobs that are easy to compromise against each other: hold the fixture rigidly enough to survive repeated heavy loading, and keep its optical axis aimed with enough precision that the beam still meets photometric requirements. The mounting ring's purpose is to carry that structural load through the base can and pavement rather than through the fixture's own housing or optics, so the fixture itself is protected from the forces it sits under. Just as importantly, because the ring's internal profile fixes the fixture's position and orientation every time it is inserted, a fixture removed for cleaning or lamp replacement goes back in correctly aligned without requiring re-aiming in the field — turning what could be a specialist realignment task into routine maintenance.

Application

Where Is It Used?

Mounting rings are used wherever inset AGL fixtures are installed on paved surfaces, including:

Runway Lighting: For inset runway centreline lights, touchdown zone lights, threshold lights, end lights, and edge lights (where flush mounting is required).
Taxiway Lighting: For inset taxiway centreline lights, edge lights, stop bars, and clearance bars.
Approach Lighting: For inset approach light fixtures and barrettes.
Apron Lighting: For inset apron lighting and guidance systems.

The ring is typically installed in a base can that is embedded in the pavement, but in some cases, it can be installed directly into a prepared hole in the pavement using epoxy or mechanical anchors. The ring is designed to be flush with or slightly below the pavement surface to avoid interference with aircraft tyres and snowploughs.

Placement

Installation & Location

The ring is set into the pavement base can (or directly into a formed pavement pocket) so its top face sits exactly flush with the surrounding pavement surface, since a ring proud of or recessed below grade becomes either a FOD/tyre hazard or a water-pooling point. Ring position and level are checked against the pavement surface during setting-out, typically with a straightedge across the surrounding slab, before the fixture is bolted onto it; the ring's gasket or sealing face is inspected for pavement debris or old sealant before each re-fit so the fixture-to-ring seal isn't compromised by material trapped underneath.

Function

How Does It Work?

The mounting ring functions as the primary alignment and retention device for the inset fixture. Its design ensures that the fixture is held securely, correctly orientated, and protected from the harsh pavement environment:

Alignment: The ring's internal profile (often tapered or stepped) aligns the fixture as it is inserted, ensuring that the fixture's optical axis is precisely aligned with the required beam direction. This is critical for ensuring that the light beam meets the photometric requirements specified in ICAO and FAA standards.
Retention: The ring provides threaded holes or slots for the fixture's retaining bolts. When the fixture is inserted, the bolts are tightened, securing the fixture firmly in the ring. This prevents the fixture from shifting or vibrating under aircraft loads.
Load Transfer: The ring transfers the vertical loads from the aircraft tyres (through the fixture) directly to the base can and the surrounding pavement, distributing the load evenly and preventing localised stress.
Accessibility: The ring allows the fixture to be easily removed for maintenance or replacement. Once the retaining bolts are loosened, the fixture can be lifted out of the ring without disturbing the base can or pavement.

The installation process typically involves:

Cleaning: The base can interior and the mounting ring are cleaned and inspected for damage.
Ring Placement: The mounting ring is placed inside the base can, aligning the bolt holes with the base can's threaded holes (or using separate anchor bolts).
Levelling: The ring is levelled using shims or a levelling compound to ensure the top surface is perfectly horizontal.
Securing: The ring is bolted into the base can using the specified torque.
Fixture Installation: The fixture is inserted into the ring, orientated correctly, and secured with its retaining bolts.

The mounting ring is designed to provide a service life of 20+ years, with regular inspection for wear, corrosion, and bolt tightness.

The ring sits between fixture and pavement, carrying both alignment and load

Aircraft Tyre / Snowplough Load

Vertical load passes down through the flush-mounted fixture

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Mounting Ring

Alignment: tapered internal profile orients the optical axis on insertion
Retention: threaded holes/slots secure the fixture's bolts against vibration
Accessibility: bolts loosen for removal without disturbing the base can

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Base Can & Surrounding Pavement

Load is distributed evenly outward, avoiding localised stress concentrations

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Correctly Aimed, Securely Held, Serviceable

Photometric alignment holds under load, and the fixture lifts out cleanly for maintenance

Architecture

System Architecture & Control Logic

The mounting ring is a mechanical alignment and retention component, not part of the electrical control chain — it sits in the base can or pavement recess and holds the inset fixture flush, correctly orientated, and secured against the loads of aircraft and vehicle traffic passing directly over it. Correct orientation matters because an inset fixture's beam pattern is fixed relative to its housing, so if the mounting ring lets the fixture rotate even slightly, the beam is no longer aimed where it needs to be even though the fixture itself and its circuit are functioning normally. Its condition — wear, looseness, corrosion — is assessed during physical inspection, since there is no signal path from the ring itself to the ALCMS.

Beam aim depends on this ring holding orientation — a fixture and circuit can be fully healthy and still aim wrong if it doesn't.

Construction

Physical Construction

The mounting ring is a machined annular collar of structural steel or stainless steel, hot-dip galvanised or passivated for corrosion resistance, sized so its outer diameter seats into the base can's internal bore while its inner diameter accepts and centres the fixture body. A bolt-hole pattern around the ring's face matches both the fixture base plate and the base can, clamping the two together and transferring vertical load through the ring into the can and surrounding pavement structure. The ring is machined to close tolerances on both diameters to hold the fixture's angular and horizontal alignment within the specified tolerance, since even small misalignment at this joint translates into beam-pointing error at the fixture. Gasket grooves or O-ring channels at the upper and lower faces maintain the assembly's overall IP67/IP68 seal, and the ring's corrosion-resistant finish is applied after machining to preserve its precise fit and load-bearing surfaces.

Specification

Technical Parameters

Parameter	Typical Value
Material	Structural steel (S235JR or S355JR), hot‑dip galvanised (min 85µm) or stainless steel (316L)
Outer Diameter	150mm to 300mm (6" to 12") – matches base can internal diameter
Inner Diameter	100mm to 250mm – matches fixture outer diameter
Thickness	10mm to 20mm
Surface Finish	Hot‑dip galvanised, powder‑coated, or stainless steel (plain or polished)
Bolt Hole Pattern	4 or 6 holes (M8 to M16) – matches fixture and base can
Load Capacity (vertical)	≥ 50 kN to 100 kN (depending on size and material)
Alignment Tolerance	≤ 0.5° (angular) and ≤ 0.5mm (horizontal)
Corrosion Resistance	≥ 500 hours salt spray (galvanised); ≥ 1000 hours (stainless)
Operating Temperature	-40°C to +85°C
Standards	FAA AC 150/5345‑42, ICAO Annex 14, EN 10025, ASTM A123

Compliance

Applicable Standards

FAA AC 150/5345‑42

Specification for Airport Light Bases, Transformer Housings, Junction Boxes, and Accessories (includes mounting rings)

ICAO Annex 14

Physical characteristics of AGL mounting structures and fixtures

EN 10025

Hot‑rolled products of structural steels (material specification)

ASTM A123

Standard specification for zinc (hot‑dip galvanised) coatings on iron and steel products

Prerequisites

Installation Requirements

Flush Level Setting

Civil

Set the ring into the pavement base can or formed pocket so its top face sits exactly flush with the surrounding pavement, checked with a straightedge across the surrounding slab.

Sealing Face Inspection

Mechanical

Inspect the ring's gasket or sealing face for pavement debris or old sealant before each fit so the fixture-to-ring seal isn't compromised by trapped material.

Bolt Pattern Alignment

Mechanical

Confirm the ring's bolt-hole pattern lines up with both the fixture base plate and the base can before clamping the assembly together.

Angular & Horizontal Tolerance Check

Mechanical

Verify the ring holds the fixture within its specified angular and horizontal alignment tolerance, since even small misalignment at this joint translates into beam-pointing error.

Fitment Sign-off

Documentation

Record ring level, bolt torque, and alignment as-built before the fixture is bolted on and accepted into service.

Verification

Testing & Commissioning

Optical Axis Alignment Check

Final Acceptance

Insert the fixture and confirm its optical axis aligns with the required beam direction, verified photometrically against ICAO/FAA tolerances.

Retaining Bolt Torque Verification

Final Acceptance

Torque retaining bolts to spec to secure the fixture against shifting or vibration under aircraft loads.

Level & Flush-Fit Check

Pre-Installation

Confirm the ring sits level and flush with the surrounding pavement so the inset fixture presents no trip or tyre-damage hazard.

Load Transfer Verification

Pre-Installation

Confirm the ring is correctly bedded to the base can and pavement so vertical loads transfer evenly without localised stress.

Ingress Protection Verification

Final Acceptance

Confirm the seal between the ring and base can meets its rated IP class before the surrounding pavement is finally reinstated.

Removability Check

Final Acceptance

Confirm the fixture can be lifted cleanly from the ring once bolts are loosened, verifying genuine access for future maintenance.

Documentation & As-Built Sign-off

Final Acceptance

Record ring position, alignment verification, and torque values in the commissioning dossier for handover.

Upkeep

Inspection & Maintenance

Alignment Tolerance Check

Annual

Verify angular and horizontal alignment stay within the ≤0.5° / ≤0.5 mm tolerance so the fixture seats correctly against the base can.

Bolt Torque Verification

Annual

Re-torque mounting bolts to spec so the ring maintains its rated ≥50 kN vertical load capacity and stays properly seated.

Corrosion Check

Annual

Inspect galvanised or stainless surfaces, especially the fixture-facing seat, for coating breakdown or pitting from trapped moisture.

Bolt Hole Pattern Verification

Annual

Confirm the bolt hole pattern remains true and undamaged, ensuring continued compatibility with the fixture and base can.

Seating Surface Wear Check

Annual

Check the ring's inner and outer seating surfaces for wear or deformation that could affect fixture stability or the alignment tolerance.

Stack Stability Check

Semi-annual

Verify there is no lateral play or rocking between the ring, fixture, and base can, which can develop after repeated freeze-thaw or traffic cycles.

Thickness / Deformation Check

Annual

Inspect for cracking, dents, or thinning that could compromise the ring's load capacity under repeated vertical loading.

Standing Water Check

Annual

Confirm no water pools around the ring-to-base-can interface after rain, which can indicate a settling issue or blocked drainage.

Field Notes

Common Field Issues

Corrosion of Ring and Bolts

The mounting ring and its retaining bolts are exposed to moisture, de‑icing chemicals, and fuels. Galvanised coatings can be damaged during installation, leading to rust. Use stainless steel hardware and touch up damaged coatings. Regularly inspect and replace corroded bolts.

Loose Retaining Bolts

Vibration from aircraft can cause the fixture retaining bolts to loosen, resulting in fixture misalignment or movement. Use lock washers, thread‑locking compound, and schedule regular bolt torque checks as part of the maintenance program.

Wear of Ring Internal Profile

Repeated insertion and removal of the fixture can wear the internal alignment surfaces of the ring, reducing alignment accuracy. Inspect the ring for wear and replace if necessary. Apply a thin layer of anti‑seize or grease to the fixture's mating surfaces to reduce wear.

Incorrect Ring Height or Level

If the ring is not installed at the correct height or level, the fixture's beam pattern will be misaimed. Use shims and a precision level during installation, and verify the fixture's beam orientation after installation using a photometric test.

Debris Accumulation in Ring Grooves

Dirt, rubber deposits, and debris can accumulate in the ring's grooves and bolt holes, making it difficult to insert or remove the fixture. Regularly clean the ring with a wire brush and compressed air, and ensure the fixture's mating surfaces are clean.

Galvanic Corrosion Between Dissimilar Metals

If the mounting ring and the fixture are made of dissimilar metals (e.g., galvanised steel ring and aluminium fixture), galvanic corrosion can occur at the interface. Use a corrosion‑resistant coating, apply anti‑seize compound, or use a gasket to isolate the dissimilar metals.

Damaged Threads on Bolt Holes

The bolt holes in the ring or the fixture can become stripped, preventing secure fixing. Use thread inserts (Heli‑coils) to repair damaged threads, and apply anti‑seize compound to prevent galling.

Diagnostics

Troubleshooting Guide

Rust Found on the Ring or Retaining Bolts

Likely Cause

The galvanised coating was damaged during a prior installation, allowing corrosion to start where the ring or bolts are exposed to moisture, de-icing chemicals, or fuel.

Diagnostic Steps

Inspect the ring and bolts for rust or coating damage, and check whether stainless steel hardware was used.

Corrective Action

Replace corroded bolts with stainless steel hardware, touch up damaged galvanised coating, and re-inspect at the next scheduled interval.

Fixture Misaligned or Loose Within the Ring

Likely Cause

Vibration from aircraft operations has loosened the fixture retaining bolts over time.

Diagnostic Steps

Check bolt torque against specification, and inspect for lock washers or thread-locking compound at the joint.

Corrective Action

Re-torque bolts to specification with lock washers or thread-locking compound applied, and add the ring to the routine torque-check schedule.

Fixture Alignment Accuracy Degrading Over Repeated Servicing

Likely Cause

Repeated insertion and removal of the fixture has worn the ring's internal alignment surfaces.

Diagnostic Steps

Inspect the ring's internal profile for visible wear, and compare fixture alignment against the expected tolerance after reinsertion.

Corrective Action

Replace the worn ring, and apply a thin layer of anti-seize or grease to mating surfaces going forward to reduce future wear.

Fixture Beam Pattern Misaimed

Likely Cause

The ring was not installed at the correct height or level, tilting the fixture's beam off its design aim.

Diagnostic Steps

Check ring height and level using shims and a precision level, and verify beam orientation with a photometric test.

Corrective Action

Re-shim and re-level the ring to the correct height, and re-verify with a photometric test after adjustment.

Fixture Difficult to Insert or Remove

Likely Cause

Dirt, rubber deposits, or debris have accumulated in the ring's grooves and bolt holes.

Diagnostic Steps

Inspect the ring grooves and mating surfaces for visible debris buildup.

Corrective Action

Clean the ring with a wire brush and compressed air, and ensure the fixture's mating surfaces are clean before reinsertion.

Corrosion Found at the Ring-to-Fixture Interface

Likely Cause

The mounting ring and fixture are made of dissimilar metals, causing galvanic corrosion at their interface.

Diagnostic Steps

Inspect the interface for corrosion products, and confirm the materials of the ring and fixture.

Corrective Action

Apply a corrosion-resistant coating, anti-seize compound, or an isolating gasket at the interface to prevent further galvanic action.

Fixture Will Not Fasten Securely

Likely Cause

The bolt holes in the ring or fixture have become stripped, preventing secure fixing.

Diagnostic Steps

Inspect the bolt holes for stripped or damaged threads.

Corrective Action

Repair damaged threads with thread inserts (Heli-coils) and apply anti-seize compound to prevent future galling.

Reliability

Failure Modes & Root Causes

Retaining Bolt Fatigue Fracture

High Severity

Root Cause

Cyclic shear and impact loading from repeated aircraft wheel passes, combined with under-torqued bolts that allow micro-movement and accelerated fatigue.

Effect

Bolt shears or backs out entirely, leaving the fixture unrestrained within the ring and at risk of ejection under load.

Detection Method

Scheduled torque verification against specification, and visual inspection for bolt head deformation, cracking, or missing hardware.

Ring Body Fatigue Cracking

High Severity

Root Cause

Sustained high-cycle wheel loading beyond the ring's fatigue life, a casting or machining flaw acting as a stress riser, or an undersized ring for the traffic category it serves.

Effect

Loss of structural rigidity around the fixture, uneven load transfer into the base can, and eventual ring failure under wheel load.

Detection Method

Close visual inspection of the ring body for hairline cracks during fixture removal, and dye-penetrant or magnetic-particle testing where cracking is suspected.

Galvanic Corrosion at Ring-to-Fixture Interface

Medium Severity

Root Cause

Dissimilar metals between the ring and fixture housing in continuous contact with moisture, forming a galvanic couple that preferentially corrodes the less noble metal.

Effect

Build-up of corrosion product at the interface that binds the fixture in place, making removal difficult and accelerating material loss at the contact surfaces.

Detection Method

Visual inspection of the interface during scheduled servicing, checking for staining, pitting, or resistance to fixture removal.

Internal Alignment Profile Wear

Medium Severity

Root Cause

Abrasive wear from repeated insertion and removal of the fixture during routine maintenance, compounded by grit or debris trapped between the mating surfaces.

Effect

Progressive loosening of fit tolerance, so the fixture no longer seats in the same position each time and beam aim drifts out of tolerance after servicing.

Detection Method

Post-servicing alignment or photometric check, and periodic gauging of the internal profile against the manufacturer's wear limit.

Protective Coating Breakdown

Low Severity

Root Cause

Mechanical damage to the galvanised or powder-coated finish during installation or servicing, or long-term chemical attack from de-icing fluid and fuel exposure.

Effect

Localised exposure of bare base metal that, left untreated, progresses to surface corrosion and eventually threatens the ring's structural section.

Detection Method

Visual inspection for coating chips, scratches, or discoloration during scheduled maintenance walks.

Bolt Hole Thread Stripping

Medium Severity

Root Cause

Repeated over-torquing during servicing, cross-threaded bolts on reinstallation, or galling between mismatched thread and bolt materials.

Effect

Bolt no longer draws up to specified torque, leaving the fixture under-clamped and vulnerable to the loosening and fatigue failure modes above.

Detection Method

Torque verification during servicing, feeling for a bolt that spins without resistance or fails to reach specified torque.

Precautions

Safety & Operational Notes

Series Circuit Isolation

Electrical Safety

De-energise and lock out the circuit and verify zero energy before lifting the fixture out of the mounting ring or opening the base can beneath it.

Standing Water in the Base Can

Electrical Safety

Treat any water pooled around the mounting ring or in the can as potentially energised until isolation is confirmed, and drain before reaching in.

Correct Orientation on Reassembly

Compliance

Seat the fixture into the ring at the correct horizontal and vertical orientation before locking it in place, since an inset fixture installed off-orientation can present the wrong beam direction to approaching traffic.

Handling the Ring & Fixture

Personnel Safety

Use proper lifting technique for the heavy steel ring and fixture assembly to avoid strain injury or a dropped component in the base can.

Airside Work Coordination

Operational

Coordinate with ATC/airside and raise a NOTAM where the fixture will be dark during the work.

FOD Control

Operational

Account for all fasteners and gaskets while the base can is open, and secure or remove loose material before reinstating the fixture.

Insulation Test Before Re-Energisation

Electrical Safety

Megger test the circuit after any connector or transformer work before restoring power, since a residual fault can trip the CCR or damage other fixtures on the same loop.

Field Insight

Engineering & Expert Notes

By Rahul Sharma

Airfield Ground Lighting Specialist

Ring Wear Accumulates Faster Than It Looks From a Quick Check

Precision

Repeated fixture removal and reinsertion for maintenance gradually wears the precision-machined mating surfaces of a mounting ring; a ring that's seen many maintenance cycles can have looser tolerance than its visual condition suggests. Track cycle count or age, not just visual wear, when deciding on replacement.

Verify Ring Seating Before Blaming the Fixture for Misalignment

Alignment

A fixture reported as misaligned is sometimes actually a ring that's not fully and evenly seated in the base can; check ring seating first, since it's a faster fix than adjusting or replacing the fixture itself.

Inspect the Ring-to-Can Contact Surface for Debris Buildup

Corrosion

Dirt, sand, or corrosion product accumulating between the ring and the base can prevent full, even seating even when the ring itself is in good condition; clean this interface during routine fixture maintenance rather than only when a problem is already suspected.

Re-Torque Retaining Fasteners After the First Maintenance Cycle Post-Installation

Mechanical

The first time a ring's fixture is removed and reinserted after initial installation is a good checkpoint to verify retaining fasteners haven't loosened, since that removal cycle itself can reveal marginal torque that wasn't obvious at commissioning.

Frequent Maintenance Access Points Need More Frequent Seal Checks

Durability

Locations with fixtures that are serviced often — due to known reliability issues or high-priority positions — see their mounting ring seals disturbed more frequently than the general array; weight seal inspection frequency accordingly rather than applying a uniform schedule.

Track Removal/Reinsertion Cycles for High-Maintenance Fixture Locations

Documentation

Where a specific fixture location requires frequent removal for cleaning or replacement, logging the cycle count on the mounting ring helps anticipate wear-related replacement before it causes a loose or misaligned fixture.

Quick Answers

Frequently Asked Questions

Short answers about mounting rings: function, alignment, loading, standards and maintenance.

Q1What is a mounting ring in airfield ground lighting?

A mounting ring, also called a fixture ring, retaining ring or inset ring, is a heavy-duty steel annular component installed inside the base can to secure and align an inset (flush-mounted) AGL fixture.

Q2What does a mounting ring do?

It aligns the fixture's optical axis with the required beam direction, retains the fixture with bolts against shifting and vibration, and transfers vertical aircraft tyre loads to the base can and surrounding pavement.

Q3Where are mounting rings used?

With inset runway centreline, touchdown zone, threshold and end lights, inset taxiway centreline and edge lights, stop bars and clearance bars, inset approach lights and inset apron lighting.

Q4What materials and loads do mounting rings handle?

Structural steel (S235JR or S355JR), hot-dip galvanised to at least 85 µm, or stainless steel, with a vertical load capacity of at least 50 kN to 100 kN depending on size and material.

Q5What is the alignment tolerance for a mounting ring?

The page gives 0.5° angular and 0.5 mm horizontal, checked annually so the fixture stays within its beam-alignment requirements.

Q6Which standards apply to mounting rings?

The main references are FAA AC 150/5345-42 (light bases, transformer housings, junction boxes and accessories), ICAO Annex 14, EN 10025 for the steel and ASTM A123 for galvanising.

Q7How often should mounting rings be inspected?

Annually. Verify alignment tolerance, re-torque the mounting bolts and inspect galvanised or stainless surfaces, especially the fixture-facing seat, for coating breakdown.

Q8What are the common problems with mounting rings?

Corrosion of the ring and bolts, loose retaining bolts from vibration, wear of the internal alignment profile from repeated fixture removal, and an incorrect ring height or level.

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Please read before relying on any content on this page.

Specific to this type of equipment: Signs, mounting, support, base and infrastructure content on this page is general. Sign legends, sizes, positions, mounting heights, frangibility, foundations, cable routes and surface markings are set by the approved design and the competent regulator. Work on or near runways, taxiways and aprons requires the aerodrome operator’s permission, airside safety arrangements and, where applicable, the permit-to-work. Structural, lifting, trench and excavation hazards apply; do not rely on this page for any structural, load or frangibility decision.

Purpose and intended users. This page on Mounting Ring is an independent educational and informational reference for competent, suitably trained and authorised airfield ground lighting (AGL) and aerodrome electrical personnel. It is not professional engineering, legal or regulatory advice, and using it does not create any professional or client relationship.
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