Replacement Isolating Transformer
Replacement transformer for compatible series-circuit applications.
View Details Retrofit & Upgrade
Obsolete / Legacy AGL Replacement Unit for Discontinued Equipment
A practical replacement route for components no longer readily available
Replacing legacy components takes more than finding a similar-looking product: the electrical, mechanical, optical and system interfaces must be considered before a replacement or retrofit is selected. We help maintenance teams identify installed equipment and develop a practical replacement route.
Supplied by Precision AGL Solutions
Product Overview
Obsolete / Legacy AGL Replacement Unit
What It Is
Older airport lighting systems often contain discontinued or obsolete components no longer readily available through the original supply chain. Precision AGL Solutions supports identifying installed legacy equipment and developing a replacement route.
The assessment can cover runway and taxiway lighting equipment, isolating transformers, connectors, CCR components, illuminated signs and associated airport electrical infrastructure.
Key Benefits
- Identify discontinued equipment accurately
- Reduce the risk of incompatible replacement parts
- Determine whether direct replacement is practical, or identify retrofit alternatives
- Retain serviceable portions of existing infrastructure
- Support planned rehabilitation, reduce downtime
- Improve spare-parts planning
- Document legacy installations for future maintenance
Applications
Legacy Replacement and Retrofit Support
Lighting equipmentObsolete runway and legacy taxiway lighting equipment; discontinued LED or halogen assemblies.
TransformersDiscontinued isolating transformers.
ConnectorsObsolete primary and secondary connectors.
CCR componentsLegacy CCR components.
SignsAirport guidance signs and illumination components.
RehabilitationAgeing field components, electrical accessories, refurbishment and lifecycle management.
Legacy Equipment Identification
First Establish Exactly What Is Installed
Useful Information
- Original manufacturer, equipment model, catalogue or part number, serial number
- Equipment rating, manufacturing information, dimensions
- Connector arrangement, cable interface
- Photographs, installation location, application within the system
Tip
Older equipment may have several versions, revisions or manufacturer-specific interfaces. A clear photograph of the nameplate often gives important information for the initial assessment.
Replacement Process
A Structured Sequence
IdentifyIdentify installed equipment
ApplicationVerify application
ElectricalCheck electrical compatibility
MechanicalCheck mechanical compatibility
Optical & systemReview optical and system requirements
SelectSelect replacement
Each stage helps establish whether the component can be replaced directly or a modified or retrofit solution is more appropriate.
Assessment Stages
Detail for Each Stage
1. Identify & 2. Verify Application
Identify equipment from nameplate, catalogue or model number, photographs and airport documentation. Where the label is damaged or missing, photographs of the complete equipment and connections still help.
Then establish its actual role: runway, taxiway or approach lighting, series-circuit infrastructure, CCR equipment, illuminated signage, field connection systems or fixture assemblies.
3. Electrical & 4. Mechanical
- Electrical: voltage, current, frequency, power rating, transformer characteristics, load, control interface, connector pin configuration, circuit arrangement, monitoring
- Mechanical: dimensions, mounting points, fixing, cable entry, connector position, enclosure, weight, clearances, adjacent components
- Similar dimensions can still be unsuitable if electrical characteristics differ
- Critical in existing bases, pits, fixtures, signs or enclosures
Optical & System Requirements, and Selection
Maintain the Intended Function
5. Optical and System
- Optical characteristics, light distribution, luminous performance
- Colour requirements, beam characteristics, fixture geometry
- Sign illumination, system-level performance
6. Possible Outcomes
- Direct replacement, compatible replacement from an alternative source
- Replacement assembly, retrofit module
- Modified installation, technology conversion, complete component upgrade
Replacement Isolating Transformers
Common in Series-Circuit Systems
Assessment Can Include
- Original transformer model, primary and secondary characteristics
- Power rating, physical dimensions
- Connector arrangement, cable interface, installation method
- Associated fixture or circuit
Principle
Select a compatible replacement from the installed circuit and application rather than appearance alone.
Replacement Connectors
Damaged, Worn or Obsolete Field Connections
Verify
- Connector type, cable construction, conductor size
- Electrical requirements, termination method
- Sealing arrangement, mating interface, existing installation configuration
Principle
The replacement must give a suitable electrical and mechanical interface with the existing cable and mating component.
Legacy CCR Components
Discontinued Cards and Modules
Assessment Can Consider
- CCR manufacturer, model, card number, module type
- Electrical interface, connector configuration, control requirements
- Firmware or configuration requirements, physical dimensions
Alternative
Where direct card replacement is impractical, consider a broader refurbishment or regulator replacement strategy.
Legacy Airfield Lighting Fixtures
Discontinued Sources, Drivers and Optics
Possible Replacement Routes
- Replacement light source, LED retrofit module
- Driver replacement, electrical component replacement
- Complete fixture replacement, halogen-to-LED conversion
Principle
Preserve the required function and compatibility of the installed lighting system.
Obsolete Sign Components
Component-Level Refurbishment
Assessment May Cover
- Sign type and dimensions, LED boards, drivers
- Internal wiring, connectors, facia components
- Illumination method, electrical supply
Alternative
Where the enclosure and face remain serviceable, component-level refurbishment may be an alternative to complete sign replacement.
Direct Replacement vs Retrofit
Not Every Obsolete Component Needs a System Replacement
Direct Replacement May Suit Where
- The original specification remains available
- Interfaces unchanged, physical dimensions match
- Electrical characteristics compatible
- Required performance can be maintained
Retrofit May Suit Where
- The original component is discontinued, replacement technology has changed
- Spare parts are no longer readily available
- Existing equipment can be retained
- A newer technology provides a suitable alternative
Legacy Equipment Refurbishment
Part of a Wider Program
Maintenance Teams May Inspect
- Equipment housing, wiring, connectors, seals
- Mounting hardware, electrical interfaces, optical components
- Associated transformers, adjacent infrastructure
Benefit
Helps identify additional ageing components before they cause operational problems.
Installation Considerations
Verify Before Installing a Replacement or Retrofit Unit
IdentityConfirm existing equipment identity, verify application
ElectricalCheck electrical compatibility
MechanicalDimensions and mounting
OpticalReview optical requirements where applicable
InterfacesCable and connector interfaces; associated transformers or drivers
InstallReview documentation, install per maintenance procedure
CheckFunctional and operational checks
Any modification to operational airfield lighting should follow applicable airport safety, maintenance and approval procedures.
Documentation for Legacy Replacement
Valuable for Older Infrastructure
Replacement Documentation Can Include
- Original manufacturer, model, part number, rating
- Replacement manufacturer, part number, rating
- Equipment location, installation date, reason for replacement
- Compatibility assessment, relevant photographs, test or commissioning information
Benefit
Records provide a reference for future maintenance and can gradually replace incomplete legacy equipment information.
Spare Parts & Lifecycle Management
Inventory of Identified Replacements
Planning Can Prioritize
- Safety-critical lighting equipment
- Components with long procurement times, discontinued equipment
- Frequently failing components, equipment installed in large quantities
- Components with no readily available direct replacement
Benefit
An accurate list of installed legacy equipment also supports future modernization planning.
Safety
Electrical Safety — Isolation and Lock-Out
WARNING — never open a live series circuit. An open series circuit driven by a constant-current regulator can produce dangerously high voltage. Opening, cutting or disconnecting any part of an energised circuit can cause serious injury or death and damage equipment.
- De-energise the circuit at the regulator and apply the site lock-out / tag-out (LOTO) procedure before any work
- Where the circuit must be isolated or shorted, use the series circuit cut-out switch or approved isolation device — not an improvised bypass
- Verify the circuit is de-energised and the output is isolated before touching conductors, connectors, splices or transformers
- Work only under the airport's permit-to-work system, using qualified personnel and the manufacturer's instructions
- Follow the applicable national electrical safety regulations and site procedures
Series-Circuit Compatibility
Check the Circuit Before Changing the Technology
LED Retrofit on a Series Circuit
LED fixtures draw far less power than halogen ones, so the circuit load falls. Check the regulator's minimum-load and power-factor limits, that the circuit current stays correct at every brightness step (for example 2.8, 3.4, 4.1, 5.2 and 6.6 A on a five-step 6.6 A circuit), and that lamp-out monitoring still works. A replacement must also match the original photometric performance, not just brightness.
Legacy Materials
Some older transformers, capacitors and cables may contain hazardous materials, including PCBs. Test or confirm before handling, and follow the airport and national rules for disposal.
Standards & Project Requirements
Assess Against the Installed System
References
- FAA AC 150/5340-26C: maintenance of airport visual aid facilities
- FAA AC 150/5345-10H: constant current regulators and regulator monitors
- FAA AC 150/5345-47C: isolation transformers
- FAA AC 150/5345-26E: L-823 plug and receptacle, cable connectors
- FAA AC 150/5345-46F: runway, taxiway, heliport and vertiport light fixtures
- FAA AC 150/5345-53D: Airport Lighting Equipment Certification Program
- ICAO Doc 9157 Part 5 and the Annex 14 aerodrome maintenance provisions
Changed Technology
Where a replacement changes the original technology or configuration, review it for electrical, mechanical, optical and system-level suitability. Approvals, inspections, testing or documentation may be required by the airport and the authority. For FAA-funded projects, specified equipment must be listed under the FAA Airport Lighting Equipment Certification Program (AC 150/5345-53D).
What to Send for Identification
The Fastest Assessment
Provide As Much As Possible
- Equipment nameplate photograph, manufacturer name, model number
- Catalogue or part number, serial number, equipment rating
- Dimensions, connector photographs, cable interface details
- Installation photographs, existing documentation, description of the application
Tip
Even when the original part number is unavailable, photographs of the equipment and its installation give useful starting information.
FAQ
Obsolete / Legacy AGL Replacement Unit — Frequently Asked Questions
What is the obsolete / legacy AGL replacement service?
Older airport lighting systems often contain discontinued or obsolete components that are no longer readily available through the original supply chain. Precision AGL Solutions supports identifying the installed legacy equipment and developing a replacement route. The assessment can cover runway and taxiway lighting equipment, isolating transformers, connectors, CCR components, illuminated signs and associated airport electrical infrastructure.
What information is needed to identify legacy equipment?
Useful information includes the original manufacturer, equipment model, catalogue or part number, serial number, equipment rating, manufacturing information, dimensions, connector arrangement, cable interface, photographs, installation location and application within the system. A clear photograph of the nameplate often gives important information, since older equipment may have several versions, revisions or manufacturer-specific interfaces.
How is a replacement route assessed?
The sequence is to identify the installed equipment, verify its application, check electrical compatibility, check mechanical compatibility, review optical and system requirements, and then select the replacement. Each stage helps establish whether the component can be replaced directly or whether a modified or retrofit solution is more appropriate.
Why is a similar-looking replacement not enough?
Similar dimensions can still be unsuitable if electrical characteristics differ. A replacement transformer, for example, should be selected from the installed circuit and application rather than appearance alone, and a replacement connector must give a suitable electrical and mechanical interface with the existing cable and mating component.
When does direct replacement suit, and when does retrofit?
Direct replacement may suit where the original specification remains available, interfaces are unchanged, dimensions match, electrical characteristics are compatible and the required performance can be maintained. A retrofit may suit where the original component is discontinued, spare parts are no longer readily available, the existing equipment can be retained and a newer technology provides a suitable alternative. Outcomes range from direct replacement and compatible replacement from an alternative source to retrofit modules, technology conversion and complete component upgrade.
What is assessed for legacy transformers and connectors?
For isolating transformers, the assessment can include the original model, primary and secondary characteristics, power rating, dimensions, connector arrangement, cable interface, installation method and the associated fixture or circuit. For connectors it covers connector type, cable construction, conductor size, electrical requirements, termination method, sealing arrangement, mating interface and the existing installation configuration.
Can discontinued CCR components be replaced?
The assessment can consider the CCR manufacturer, model, card number and module type, the electrical interface, connector configuration, control requirements and any firmware or configuration requirements, along with physical dimensions. Where direct card replacement is impractical, a broader refurbishment or regulator replacement strategy may be considered.
What options exist for legacy fixtures and signs?
For fixtures, replacement routes include a replacement light source, an LED retrofit module, driver replacement, a halogen-to-LED conversion or complete fixture replacement, preserving the required function and compatibility. For signs, where the enclosure and face remain serviceable, component-level refurbishment of LED boards, drivers, internal wiring, connectors and facia components may be an alternative to complete sign replacement.
Why document legacy replacements and plan spares?
Records of the original and replacement manufacturer, model, part number and rating, the location, date and reason for replacement, the compatibility assessment, photographs and test information give a reference for future maintenance. Spare-parts planning can prioritize safety-critical lighting equipment, components with long procurement times, frequently failing components, equipment installed in large quantities and components with no readily available direct replacement.
Do replacements that change the technology need approval?
Where a replacement changes the original technology or configuration, review it for electrical, mechanical, optical and system-level suitability. Approvals, inspections, testing or documentation may be required by the airport and the authority, and for FAA-funded projects specified equipment must be listed under the FAA Airport Lighting Equipment Certification Program (AC 150/5345-53D). Related references include AC 150/5340-26C, AC 150/5345-10H, AC 150/5345-47C, AC 150/5345-26E and AC 150/5345-46F.
Is it safe to replace legacy components on a live series circuit?
No. An open series circuit driven by a constant-current regulator can produce dangerously high voltage, and opening, cutting or disconnecting any part of an energised circuit can cause serious injury or death. Any modification to operational airfield lighting should follow the applicable airport safety, maintenance and approval procedures. See the electrical safety warning on this page.
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 Legacy Replacement Support
Precision AGL Solutions supports maintenance teams in identifying obsolete and discontinued airfield lighting equipment and developing an appropriate replacement or retrofit route. Upload the existing nameplate, catalogue number or equipment photograph for identification and replacement support.
- Emailprecisionaglsolutions@gmail.com
- Websiterahulsharmaagl.in
- LinkedInPrecision AGL Solutions
- Phone+91 98214 96412
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.