THE AGL
KNOWLEDGE HUB

The AGL Knowledge Hub is a structured knowledge ecosystem for Airfield Ground Lighting: technical knowledge, standards, calculators, drawings, troubleshooting and training, all connected through the AGL Topic Hub. It follows one workflow: learn, design, build, test, maintain, troubleshoot and improve.

It is intended to support engineers (design, testing, troubleshooting and technical decisions), airport authorities (technical references, inspection, maintenance and system understanding), consultants, manufacturers, technicians, students and researchers, and trainers.

The stages are Learn, Understand, Design, Build, Test, Operate, Solve and Improve. Two further elements, Assess and Connect Everything, form a knowledge layer that runs alongside the lifecycle, since assessment and cross-linking apply at every step rather than only at the end.

The hub is planned around 29 specialized divisions. As this page currently shows, 20 are live and 9 are planned, including the Design Manual, Drawing Library, BOQ and Specification Library, Standards Hub and Engineering Toolkit. Live, in-progress and planned status is shown on each division card.

The AGL Topic Hub connects every resource around individual AGL topics, so that a topic can link to its concept, diagram, standard, product, calculation, drawing, SOP, testing, inspection, maintenance, troubleshooting, case study, quiz and research. The page describes this as the core of the Knowledge Hub.

The hub covers engineering knowledge, standards, design guidance and tools, installation and SOPs, testing and inspection, maintenance, troubleshooting and failure intelligence, training with presentations and quizzes, and research and innovation.

The AGL Troubleshooting Atlas, AGL Failure Database and AGL Engineering Case Studies are live divisions. The hub's troubleshooting approach follows a structured method: symptom, measurement, diagnosis, root cause and corrective action.

The live divisions include the AGL Inspection Handbook, the AGL Testing and Commissioning Manual, the AGL Maintenance Handbook and the AGL Asset Lifecycle Guide, covering checklists, acceptance and sign-off, preventive and corrective maintenance, and service life and renewal planning.

The AGL Standards Companion, covering ICAO, FAA and IS codes, is a live division. A separate AGL Standards Hub, intended as a codes, references and compliance index, is currently shown as planned.

No. The page presents them as long-term targets for a continuously expanding platform, including 20,000+ total resources, 3,000+ topic pages, 10,000+ quiz questions, 5,000+ failure records, 500+ engineering drawings and 500+ standards references. They are part of the long-term framework, not a description of what is published today.

Every resource should be technically accurate, standards-aligned, practical and field-oriented, professionally reviewed, easy to understand, visually consistent, continuously updated, version controlled and cross-linked.

The Knowledge Hub provides the reference knowledge, and Precision AGL Academy adds structured training on top of it so that reference knowledge becomes practical capability across the complete AGL engineering lifecycle.

The first lifecycle stage, Learn, advises starting with the fundamentals and understanding the system before working on it. Its divisions include the AGL Visual Encyclopedia, AGL Learning Academy, AGL Glossary and AGL Standards Companion.

Airfield lighting is powered through series circuits. A constant current regulator (CCR) supplies a fixed current to a loop of cable, and an isolating transformer at each light feeds the lamp or LED fixture. Brightness is set by changing the CCR current step, and an ALCMS or control panel switches circuits and monitors their status.

The ALCMS sends commands to the CCRs and switching equipment over a control network. Operators select circuits, lighting scenes and brightness steps, and the system returns status and alarms from regulators and circuits so faults are visible at the control position.

In stages: visual and mechanical checks, electrical tests on the series circuit (insulation resistance, continuity, loop resistance, current and voltage), functional tests of control and monitoring, and photometric checks of light output. Results are recorded in a test report.

Typical tests are acceptance tests before handover, commissioning tests of circuits, controls and light output together, and periodic tests during service. The electrical tests include insulation, continuity, resistance, voltage and current checks, with photometry for light output.

It measures the insulation resistance of cable, connectors, transformers and fixtures to earth, normally with an insulation resistance tester. Falling values warn of moisture or damage before they cause an earth fault.

It confirms the series loop is unbroken from the CCR through every isolating transformer and connector and back, so the circuit can carry its rated current. A break shows up as an open circuit.

Acceptance testing checks the installed system against the specification before handover. It combines visual checks, electrical tests, control and monitoring checks and, where required, photometry, with results recorded and witnessed.

It is the record of a test: the circuit or equipment tested, the date, the instruments and their calibration, the results, the acceptance criteria, the pass or fail decision and the signatures of those who performed and witnessed the test.

It is the ordered set of checks that brings a new or modified system into service: review of documents, visual and installation checks, de-energised electrical tests, energisation and current-step checks, control and monitoring tests, photometry where required, then handover documents.

Through preventive maintenance (inspection, cleaning, replacement of worn lamps or LED modules, and periodic electrical and photometric tests) and corrective maintenance for faults, with records kept for each circuit and asset. The AGL maintenance handbook covers the strategies in more detail.

Frequency is set by the aerodrome maintenance programme and the applicable regulator. In general there are regular visual checks, with electrical and photometric checks at longer intervals; follow ICAO guidance and the DGCA and aerodrome manual requirements for your airport.

It is the amount of light a fixture emits in a given direction, measured in candela. AGL specifications set minimum intensities within defined angles, usually shown on isocandela diagrams.

It is the angular width over which the fixture emits light, set by its optics. Standards define the required beam through horizontal and vertical angles and minimum intensity within them, so the pilot sees the light from the intended approach or taxi directions.

Halogen fixtures use a tungsten-halogen lamp that dims with age and fails suddenly. LED fixtures use LED modules and a driver, draw less power and last longer, but they need checking for CCR and series-circuit compatibility. Both must meet the photometric requirements of the specification.

The light base is set at the surveyed position and level in the pavement, cable and conduit are brought into it, the isolating transformer and connectors are fitted, and the fixture is fastened with the specified torque and seals. Alignment and testing follow, all per the manufacturer and project specification.

The fixture is mounted on a base or stake through a frangible coupling at the specified height and alignment, connected through its isolating transformer and connectors, and then checked for aim and electrical performance.

It is the base can that is set in the pavement or ground to house and position a light fixture and its connections. Bases are covered by the light base standards, and a base cover protects the opening when the fixture is not fitted.

It means a single failure should not remove visual guidance. Common measures are interleaved circuits so alternate lights sit on different series circuits, standby CCRs, a secondary power supply and monitoring that reports faults. The level required depends on runway type and approach category.

When lighting is unserviceable or changed in a way that affects aircraft operations, such as runway lights, approach lights or PAPI out of service. The aerodrome operator issues it under the AIP and DGCA procedures, so check the applicable rules for your airport.