Breakable Coupling
A precision‑engineered sacrificial component that connects an elevated AGL fixture's frangible pole to its base plate, designed to shear cleanly at a predetermined force threshold upon aircraft impact. This critical safety device ensures the pole breaks away predictably, minimising aircraft damage while maintaining structural integrity under normal operational loads.
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What Is It?
A Breakable Coupling (also known as a frangible coupling, shear coupling, or breakaway coupling) is a precision‑engineered mechanical component that serves as the sacrificial link between a frangible pole and its base plate or base can. It is designed to provide a controlled failure point that activates when the pole is subjected to a lateral impact force above a defined threshold—typically during an aircraft runway or taxiway excursion—causing the pole to break away cleanly and predictably, minimising damage to the aircraft and protecting pilot and passenger safety.
Key characteristics of breakable couplings include:
- Controlled Shear Failure: The coupling incorporates precision shear pins, a reduced‑diameter section, or a notched design that fractures in a predictable manner at a specific force threshold.
- Structural Integrity: Under normal operational loads (wind, vibration, fixture weight, thermal expansion), the coupling behaves as a rigid connection, maintaining the pole's stability and alignment.
- Corrosion Protection: Hot‑dip galvanised, zinc‑plated, or stainless steel construction ensures long‑term durability in the harsh airfield environment.
- Interchangeability: Designed to be replaced after a breakaway event, allowing the pole to be restored to service quickly without replacing the entire pole or base.
Breakable couplings are used in the following applications:
- Elevated Runway Edge Lights: Connecting frangible poles to base plates for runway edge light fixtures.
- Elevated Taxiway Edge Lights: Providing frangibility for taxiway edge light poles.
- Approach Lighting: Connecting frangible poles for approach light fixtures and barrettes.
- Obstruction Lighting: Providing a breakaway point for obstruction light poles.
- Airfield Signage: Connecting frangible poles to base plates for elevated signs.
The coupling is typically positioned at the base of the pole, 25‑50mm above the mounting plate, and is secured with bolts or a threaded connection. It is designed to be the weakest point in the pole assembly, ensuring that the pole breaks at the coupling rather than at the base plate or the fixture mounting.
Purpose & Function
An elevated pole has to satisfy two contradictory requirements at once: it must stay perfectly rigid under everyday wind, vibration, and the weight of the fixture, yet must give way instantly and predictably the moment an aircraft strikes it. The breakable coupling's purpose is to resolve that contradiction by concentrating the pole's one intentional weak point at a single, engineered location — rather than leaving where the pole fails to chance. Without it, an impact could just as easily snap the pole partway up (leaving a jagged stub as a secondary hazard) or transmit the full impact force down into the base plate and buried cabling, damaging infrastructure that is far more costly and time-consuming to repair than the pole itself. By fixing the break point at the coupling, the fixture's cable termination and the below-grade base assembly are protected, and the airfield can return the light to service by swapping a small, low-cost part rather than excavating the base.
Where Is It Used?
Breakable couplings are installed in all elevated AGL structures that require frangibility, including:
- Runway Edge Lighting Systems: Connecting frangible poles to base plates for elevated runway edge light fixtures on runways, runway strips, and runway intersections.
- Taxiway Edge Lighting Systems: Providing frangibility for elevated taxiway edge lights, especially on curves and at intersections.
- Approach Lighting Systems: Connecting frangible poles for elevated approach light fixtures, barrettes, and flashing light units in the approach area.
- Obstruction Lighting Installations: Providing breakaway capability for obstruction light poles located within aircraft movement areas.
- Airfield Signage Systems: Connecting frangible poles to base plates for elevated mandatory instruction signs, direction signs, and information signs.
- Sensor and Instrumentation Mounts: Providing frangibility for anemometer poles, wind cone masts, and other instrumentation in aircraft movement areas.
The coupling is designed to meet the frangibility requirements specified in ICAO Annex 14, which mandates that any fixture or structure located within the runway strip or taxiway strip must break away or yield upon impact to prevent aircraft damage. The coupling is typically rated for a specific shear force threshold (2 kN to 10 kN) that is appropriate for the fixture weight, pole height, and operational environment.
Installation & Location
The coupling is fitted between the base plate (or base can) and the pole shaft, set at the height specified for that fixture category so the designed break point sits within the correct band above grade — a specific requirement given that the whole point of the coupling is to fail predictably rather than transmit impact load into the foundation. Bolt torque on the coupling is set precisely to the manufacturer's value, since over-torquing can raise the effective break force above its rated threshold and under-torquing risks a premature or wind-induced failure. Coupling height and orientation are checked against the obstacle-limitation surface and the fixture's overall design height during installation, and re-verified whenever the pole or fixture above it is replaced.
How Does It Work?
The breakable coupling functions as a controlled failure mechanism that activates upon impact, ensuring the pole breaks away cleanly while maintaining structural integrity under normal loads:
- Normal Operation: Under normal conditions, the coupling acts as a rigid connection between the pole and the base plate. It transmits all operational loads (vertical weight of the fixture, wind loads, vibration) without yielding or deforming. The coupling is designed with a safety factor of at least 2.0 against the maximum expected operational loads.
- Impact Activation: When an aircraft contacts the pole, the lateral impact force is transmitted through the pole to the coupling. The coupling is designed to fail at a specific shear force threshold, typically between 2 kN and 10 kN, depending on the fixture type and pole size.
- Shear Mechanism: The coupling incorporates one of several failure mechanisms:
- Shear Pins: Precision‑ground pins that shear at the specified force, releasing the pole.
- Reduced‑Diameter Section: A machined groove or reduced‑diameter section that fractures under impact.
- Notched Design: A notched or scored section that provides a controlled fracture path.
- Brittle Material: A coupling made from a material that fractures in a brittle manner at the specified force.
- Clean Breakaway: The coupling is designed to fail cleanly, separating the pole from the base plate without creating sharp edges or projecting debris that could puncture aircraft tyres or cause further damage.
- Replaceability: After a breakaway event, the coupling can be replaced quickly, allowing the pole and fixture to be restored to service without replacing the entire assembly. This reduces downtime and maintenance costs.
The coupling is typically installed between the pole and the base plate, with the pole's lower end inserted into the coupling and secured with bolts or a threaded connection. The coupling itself is bolted or welded to the base plate. The design ensures that the coupling fails at the intended force threshold regardless of the direction of impact (360° frangibility).
System Architecture & Control Logic
The breakable coupling has no electrical or control function — its entire purpose is to be the predictable weak point in an elevated fixture's mechanical structure. It sits between the fixture head and the pole or base can, engineered to shear or separate cleanly at a defined load, well below what would damage the foundation or transmit a dangerous load into an aircraft that strikes it. Because it is deliberately the weakest link in that stack, everything below it — anchor bolts, base plate, base can — is sized conservatively enough that it is never at risk during a breakaway event; the energy of the impact is absorbed and dissipated at the coupling itself, not passed down the structure.
Deliberately the weakest link in the stack — everything below it is sized so it never has to absorb the impact instead.
Normal Operation vs. Impact Activation
Physical Construction
The coupling is a short, low-profile collar of structural steel or stainless steel, hot-dip galvanised or passivated for corrosion resistance, machined to bolt or thread between the fixture base and the top of the pole or stake with a matching bolt circle. Its frangibility is engineered into a deliberately weakened cross-section, achieved through a set of hardened shear pins, a reduced-diameter neck, or a notched groove, sized so the coupling shears cleanly at a calibrated load well below the force an aircraft impact would generate, while comfortably exceeding the wind and vibration loads seen in normal service. The break plane is positioned at a defined height above the mounting plate so that, once sheared, no significant stub remains proud of the surface to create a secondary hazard. Corrosion-resistant fasteners secure the coupling on both sides of the break plane, and the galvanised or stainless finish is applied after machining to protect the shear-critical section from weakening through rust.
Technical Parameters
| Parameter | Typical Value |
|---|---|
| Material | Structural steel (S235JR or S355JR), hot‑dip galvanised (min 85µm) or stainless steel (316L) |
| Diameter (outer) | 50mm to 100mm (2" to 4") – matches pole diameter |
| Height | 50mm to 100mm (2" to 4") |
| Shear Force Threshold | 2 kN to 10 kN (depending on fixture weight and pole height) |
| Shear Pin Material | Steel (hardened and ground) or brass |
| Number of Shear Pins | 2 to 6 (depending on design) |
| Breakaway Height | 25mm to 50mm above the mounting plate |
| Mounting Type | Bolted or threaded connection to pole and base plate |
| Bolt Size | M10 to M16 |
| Load Capacity (vertical) | ≥ 2 kN (depending on size and material) |
| Operating Temperature | -40°C to +85°C |
| Corrosion Resistance | ≥ 500 hours salt spray (galvanised); ≥ 1000 hours (stainless) |
| Standards | ICAO Annex 14, FAA AC 150/5220‑23A, EN 12767, FAA AC 150/5345‑42 |
Applicable Standards
ICAO Annex 14
Frangibility requirements for AGL structures and couplings
FAA AC 150/5220-23A
Frangible Connections — specifications for fuse bolts, frangible couplings, tear-through fasteners, and tear-out sections
EN 12767
Passive safety of support structures for road equipment — requirements and test methods
FAA AC 150/5345‑42
Specification for airport light bases, transformer housings, junction boxes, and accessories
Installation Requirements
Coupling Height & Position Setting
MechanicalSet the coupling between the base plate and pole shaft at the height specified for that fixture category, so the designed break point sits within the correct band above grade.
Bolt Torque Application
MechanicalTorque the coupling-to-base-plate and coupling-to-pole fasteners precisely to the manufacturer's value, since over-torquing raises the effective break force above its rated threshold and under-torquing risks a premature or wind-induced failure.
Pole Plumb & Fixture Alignment
MechanicalSeat the pole plumb and align the fixture correctly once seated in the coupling before final tightening, since misalignment can pre-stress the shear section.
Obstacle-Limitation Surface Height Check
CivilCheck coupling height and orientation against the obstacle-limitation surface and the fixture's overall design height during installation.
Corrosion Protection Verification at Install
QualityConfirm the galvanised or stainless finish at the shear-critical section is intact and undamaged before the coupling is put into service, since corrosion there alters the breakaway threshold.
Batch / Shear Rating Confirmation
DocumentationConfirm the batch-certified shear force threshold for the coupling being installed matches the fixture weight and pole height it will support.
Pre-Service Sign-off
DocumentationRecord coupling type, shear force rating, and installation torque values before the pole/fixture assembly is accepted into service.
Testing & Commissioning
Shear Force Verification
Pre-InstallationConfirm the batch-certified shear force threshold for the installed coupling matches the fixture weight and pole height it will support.
Bolt Torque Verification
Pre-InstallationTorque the coupling-to-base-plate and coupling-to-pole fasteners to spec so the rigid connection performs correctly under normal operational loads.
360° Frangibility Check
Pre-InstallationConfirm the coupling is designed and oriented to fail at the rated threshold regardless of impact direction, not just along one axis.
Alignment & Level Check
Final AcceptanceVerify the pole sits plumb and the fixture is correctly aligned once seated in the coupling, since misalignment can pre-stress the shear section.
Corrosion Protection Verification
Pre-InstallationConfirm the galvanised or stainless finish is intact and undamaged at the shear-critical section, since corrosion there alters the breakaway threshold.
Breakaway Height Verification
Final AcceptanceConfirm the break plane sits at the specified height above the mounting plate so no hazardous stub remains proud after a breakaway event.
Documentation & As-Built Sign-off
Final AcceptanceRecord coupling type, shear force rating, and installation torque values in the commissioning dossier for handover.
Inspection & Maintenance
Shear Pin / Fracture Point Inspection
AnnualInspect shear pins, grooves, or notched sections for cracking, corrosion, or partial fatigue that could lower the breakaway threshold below the 2–10 kN design range.
Bolt Torque Verification
AnnualRe-torque mounting bolts to spec, since an over- or under-torqued coupling can shift the shear threshold and cause premature or delayed breakaway.
Corrosion Check
AnnualCheck galvanised or stainless surfaces for pitting or coating breakdown, particularly at the shear plane where corrosion most affects breakaway consistency.
Rigidity Under Operational Load
Semi-annualConfirm the coupling remains fully rigid under normal wind, weight, and vibration loads with no play or partial shear developing.
Alignment Check
AnnualVerify the coupling keeps the pole and fixture properly aligned; misalignment can concentrate stress unevenly across the shear mechanism.
Post-Impact Replacement
As neededReplace the coupling entirely after any breakaway event; a fractured coupling should never be reused even if the shear looks clean.
Debris & Edge Condition Check
AnnualConfirm the fracture design still produces a clean break with no sharp edges or loose debris, in line with frangibility safety requirements.
Load Rating Documentation Review
AnnualConfirm the installed coupling's rated shear threshold still matches the fixture weight and pole height it is paired with, especially after any fixture swap.
Common Field Issues
Corrosion of Shear Pins
The shear pins are critical to the coupling's performance. Corrosion can alter the shear force threshold, potentially preventing the coupling from breaking on impact. Regularly inspect shear pins for rust, pitting, or damage. Replace pins if corrosion is present. Use stainless steel or coated pins for improved corrosion resistance.
Incorrect Shear Pin Installation
Using incorrect shear pins (wrong material, diameter, or hardness) can change the shear force threshold, compromising the frangibility. Always use manufacturer‑supplied pins and verify the shear force rating. Ensure pins are inserted fully and seated correctly.
Misalignment of Pole and Coupling
If the pole is not aligned with the coupling, bending loads can be introduced, affecting the shear performance. Ensure the pole is plumb and the coupling is level. Use alignment tools during installation.
Over‑torquing of Coupling Bolts
Over‑torquing the bolts that secure the coupling to the pole or base plate can deform the coupling or shear pins, altering the frangibility. Use a torque wrench and follow the manufacturer's torque specifications.
Galvanic Corrosion with Dissimilar Metals
If the coupling and the pole or base plate are made of dissimilar metals, galvanic corrosion can occur at the interface. Use anti‑seize compound, isolation gaskets, or ensure all components are of the same material.
Damage from Snowploughs or Maintenance Vehicles
While frangible couplings are designed to break on aircraft impact, they can also be damaged by snowploughs or maintenance vehicles. Use protective covers or markers to increase visibility, and inspect couplings after any known contact.
Inadequate Record Keeping
After a breakaway event, it is important to document the event and replace the coupling with the correct shear pin rating. Maintain records of coupling installations, shear pin ratings, and inspection dates to ensure consistency and safety.
Troubleshooting Guide
Coupling Fails to Shear Under Expected Impact Load
Coupling Shears Prematurely Under Normal Loads (Wind, Vibration)
Corrosion Found at the Coupling-to-Pole or Coupling-to-Base-Plate Interface
Coupling Damaged Without an Aircraft Impact Event on Record
Cannot Confirm Correct Shear Pin Rating Is Currently Installed
Coupling Broke Away and Was Reused Without Being Rated Correctly
Failure Modes & Root Causes
Corrosion of Shear Pins
Incorrect Shear Pin Installation
Misalignment of Pole and Coupling
Over-Torquing of Coupling Bolts
Galvanic Corrosion with Dissimilar Metals
Post-Impact Replacement Neglect
Safety & Operational Notes
Frangibility Not to Be Defeated
MechanicalNever substitute the coupling with a rigid fitting, weld across it, paint or lubricate the fracture zone, or use it beyond its rated service life; it must shear cleanly at its designed shear force to limit damage on aircraft impact.
Correct Installation Torque
MechanicalTorque the coupling exactly to the manufacturer's specification; over-torquing can raise the effective breakaway force above its rated threshold, while under-torquing can cause premature or uneven shearing.
Verify Isolation Before Servicing
Electrical SafetyDe-energise and lock out the circuit and verify zero energy before disturbing a coupling that carries the fixture's bonding/earth jumper, and confirm the jumper is intact and reconnected after reassembly.
Replace, Don't Reuse, After an Impact
ComplianceA coupling that has sheared or absorbed an impact event has done its job and must be replaced, not reinstalled, since its fracture characteristics cannot be relied upon a second time.
Airside Work Coordination
OperationalCoordinate with ATC/airside and raise a NOTAM where the fixture will be dark or out of tolerance during coupling replacement.
FOD Control
OperationalAccount for all fasteners and shear pins on the movement area, and clear the work site fully before reinstating the fixture.
PPE & Grounding
Personnel SafetyUse insulated tools where the coupling is part of a live-circuit bonding path, and confirm bonding continuity before returning the fixture to service.
Engineering & Expert Notes
Shear Threshold Is Specific to the Pole and Fixture Weight Above It
DesignA breakable coupling rated for one pole/fixture combination isn't necessarily correct for a different, heavier fixture retrofitted onto the same pole later; verify the coupling's rated shear threshold still matches the actual installed load whenever the fixture above it changes.
Environmental Ageing Shifts Shear Characteristics Without Visible Damage
InspectionUV exposure and thermal cycling can change a composite or aluminium coupling's shear point over years of service even when the part shows no visible cracking or wear. Periodic torque/shear verification belongs in the overhaul cycle, not only in post-impact inspection.
Over-Torquing at Installation Can Pre-Stress the Shear Point
SafetyInstalling a breakable coupling with excessive torque, intending to be 'extra secure,' can pre-load the precision shear feature and change its effective failure threshold. Torque strictly to the manufacturer's specification, not by feel.
Re-Check Fixture Aim After Any Coupling Service
AlignmentBecause the coupling sits directly in the load path between pole and fixture, removing and reinstalling it — even for routine inspection — can shift optical alignment slightly. Re-verify aim after any coupling is disturbed, not just after a full replacement.
De-Icing Fluid Exposure Degrades Seals Faster Than Weather Alone
DurabilityCouplings near heavy de-icing traffic areas see faster gasket and seal degradation than the general array; specify seal materials rated for glycol contact and inspect condition at overhaul rather than on a uniform fleet-wide schedule.
Distinguish a Sheared Coupling From a Snapped Pole
TroubleshootingAfter any impact, examine whether the coupling failed at its designed shear point or whether the pole itself fractured elsewhere; a pole failure outside the coupling indicates either an out-of-spec impact or a coupling that didn't function as designed, and both need investigation before simple replacement.
Frequently Asked Questions
Short answers about the breakable coupling: what it is, how it works, specifications, standards, maintenance and common faults.
Q1What is a breakable coupling?
A breakable coupling (also called a frangible, shear or breakaway coupling) is the sacrificial link between a frangible pole and its base plate or base can. It is designed to fail cleanly when a lateral impact force, typically from an aircraft excursion, exceeds a defined threshold.
Q2Why do elevated AGL poles need a breakable coupling?
A pole must stay rigid under wind, vibration and fixture weight, yet give way predictably when struck. The coupling concentrates the intentional weak point at one engineered location, so the pole does not snap partway up or transmit impact force into the base plate and buried cabling. The light can then be restored by swapping a small part.
Q3Where are breakable couplings used?
They are used on all elevated AGL structures that need frangibility: runway edge lights, taxiway edge lights, approach lights, obstruction lights, elevated airfield signs, and sensor and instrument mounts such as anemometer poles and wind cone masts in aircraft movement areas.
Q4How does a breakable coupling work?
In normal operation it acts as a rigid connection, with a design safety factor of at least 2.0 against the maximum expected operating loads. On impact, precision shear pins, a reduced-diameter section or a notched design fractures at a specific force threshold so the pole breaks away at the coupling.
Q5What are the typical specifications?
Typical shear force thresholds are 2 kN to 10 kN depending on fixture weight and pole height, with 2 to 6 shear pins and a breakaway height of 25 mm to 50 mm above the mounting plate. Outer diameter is usually 50 mm to 100 mm, matching the pole, and bolt sizes run from M10 to M16.
Q6What is a breakable coupling made of?
Typical construction is structural steel (S235JR or S355JR), hot-dip galvanised to at least 85 µm, or 316L stainless steel. Shear pins are hardened steel or brass. Corrosion resistance is typically at least 500 hours salt spray for galvanised and 1,000 hours for stainless.
Q7Why does bolt torque matter on a breakable coupling?
Torque must match the manufacturer's value. Over-torquing can raise the effective break force above the rated threshold, and under-torquing risks a premature or wind-induced failure.
Q8Which standards apply to breakable couplings?
The main references are ICAO Annex 14 (frangibility), FAA AC 150/5220-23A (frangible connections), EN 12767 (passive safety of support structures) and FAA AC 150/5345-42 (light bases and accessories). Always verify the current edition and your aerodrome's approved requirements.
Q9How often should a breakable coupling be inspected?
Typical intervals are annual for shear pin and fracture point inspection, bolt torque, corrosion, alignment and debris checks, and semi-annual for rigidity under operational load. A coupling is replaced after a breakaway event. Your airport's approved maintenance programme takes precedence.
Q10What are the common problems with breakable couplings?
Common problems are corrosion of shear pins, incorrect shear pin installation, misalignment of pole and coupling, over-torquing of coupling bolts, galvanic corrosion with dissimilar metals, damage from snowploughs or maintenance vehicles, and inadequate record keeping of the installed rating.
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