The dedicated failure classification for the civil/mechanical interface between AGL fixtures and the airfield pavement/foundation system. A lighting fixture can be electrically healthy but still unserviceable due to base-can deterioration, water accumulation, incorrect elevation, settlement, alignment problems, cable-entry damage or pavement-interface deterioration — this division exists to catch exactly that class of failure.
Key principle — Division 16 supports root-cause analysis, not just defect recording. If base-can flooding repeatedly occurs despite maintenance, investigate the underlying groundwater/drainage condition rather than repeatedly replacing the fixture. Every record should trace: fixture → base can → foundation/pavement → drainage/ground condition → cable interface → fixture mounting → elevation/alignment → failure mode → root cause → corrective action → verification → recurrence/seasonal trend.
Corrosion of the base can or associated metallic components that affects structural, mechanical or environmental integrity.
Water remains within the base can instead of being effectively drained.
Significant entry or accumulation of water in the base can that compromises the fixture/cable installation.
Water accumulation may be a persistent/local condition. Base-can flooding represents a more severe water-ingress condition.
Physical deformation of the base can that affects the fixture installation or structural integrity.
Failure of the drainage arrangement around or within the base-can/civil interface to remove water effectively.
Vertical or differential movement of the foundation supporting the AGL fixture/base-can assembly.
Cracking of the foundation or surrounding civil structure supporting the AGL installation.
Failure of the mechanical arrangement securing the fixture to the base can/foundation.
Installed fixture elevation is not at the intended design/installation level.
Compare:
Fixture is not correctly oriented or positioned relative to the intended AGL layout.
Cross-reference with Division 01 — Lighting Fixture Failures, where fixture misalignment is the resulting failure.
Failure, damage or incorrect installation of the frangible coupling/interface associated with the AGL fixture.
Cross-reference with Division 06 — Mechanical & Structural Failures.
Damage at the interface between the AGL installation and surrounding civil/airfield infrastructure.
Damage to the point where cables enter or pass through the base can/pit.
Failure of the sealing arrangement around cable entries that allows water/moisture penetration.
Cross-reference with Division 05 — Cable & Connector Failures.
Damage, deformation or deterioration of the cover protecting an AGL pit/base-can or associated civil interface.
Deterioration or damage of the pavement surrounding the AGL installation.
Movement or instability of surrounding soil affecting the AGL base/foundation/civil interface.
Problems caused by groundwater or a high/variable water table affecting the AGL civil installation.
If base-can flooding repeatedly occurs despite maintenance, investigate the underlying groundwater/drainage condition, rather than repeatedly replacing the fixture.
Standard record structure, failure chains, diagnostic matrix, asset-level inspection structure and RCA linkage that apply across all 18 Division 16 failure topics.
Every Division 16 failure should be converted into a standard failure record with the following fields:
Division 16 is built around five recurring failure chains that connect civil root causes to electrical/optical outcomes:
Drainage failure → base-can water accumulation → corrosion/moisture ingress → fixture/cable deterioration → lighting failure
Soil movement → foundation settlement → base-can/fixture movement → incorrect elevation/alignment → AGL performance degradation
Cable-entry damage → cable sealing failure → water ingress → insulation/connector deterioration → electrical failure
Road/pavement interface damage → water accumulation/mechanical instability → base-can deterioration → fixture mounting/alignment failure
Water-table/drainage problem → persistent moisture → base-can corrosion → mounting degradation → fixture movement/failure
Each of the 18 topics maps to a primary investigation focus:
Division 16 allows the engineer to inspect the complete interface across seven layers:
1. Fixture
Mounting, elevation, alignment, frangible coupling.
2. Base Can
Corrosion, deformation, water, mounting interface.
3. Cable Interface
Cable entry, sealing, mechanical protection, moisture.
4. Foundation
Settlement, cracking, stability.
5. Pavement
Cracking, settlement, interface damage, surface level.
6. Drainage
Drain path, water accumulation, flooding.
7. Ground
Soil movement, groundwater, water-table condition.
Division 16 links every failure to the Root Cause Analysis Database. The most relevant RCA categories for base-can and civil-interface failures are:
Every failure receives a severity classification, plus operational-impact tagging:
Critical / Safety-Critical — immediate operational or safety risk
Major / Operationally Critical — significant availability impact
Moderate — reduced performance, not yet critical
Minor / Non-Critical — limited or no operational effect
Degradation / Intermittent / Latent — developing or hidden fault
Visual evidence
Technical evidence
The major value of Division 16 is that it captures the civil root causes behind recurring AGL failures. Repeated fixture failures associated with a flooded base can should lead the investigation toward drainage, groundwater and water-table conditions, rather than treating each failed fixture as an isolated electrical failure. Recommended database architecture: Civil/AGL Asset → Base Can → Foundation/Pavement → Drainage/Ground Condition → Cable Interface → Fixture Mounting → Elevation/Alignment → Failure Mode → Root Cause → Corrective Action → Verification → Recurrence/Seasonal Trend.
Quick answers about base-can and civil-interface failures, as covered in Division 16 of the AGL Failure Database.
Division 16 covers the civil and mechanical interface between AGL fixtures and the airfield pavement and foundation system. It contains 18 published topics (BCF-01 to BCF-18), from base-can corrosion and drainage failure to foundation settlement, cable-entry damage, soil movement and water-table problems.
Base-can corrosion, water accumulation, flooding and deformation, drainage failure, foundation settlement and cracking, fixture mounting failure, incorrect fixture elevation and alignment, frangible-coupling failure, civil-interface damage, cable-entry damage, cable sealing failure, pit-cover damage, road/pavement interface damage, soil movement and water-table-related problems.
They fall into seven groups: Base-Can Condition (4 topics), Drainage & Water (3), Fixture Installation & Position (3), Frangible & Civil Interface (2), Cable & Sealing Interface (2), Pit & Pavement Interface (2) and Ground & Hydrogeological (2).
Division 16 is built around five recurring chains that connect civil root causes to electrical and optical outcomes. Drainage failure leads to base-can water accumulation, corrosion or moisture ingress, fixture and cable deterioration, and lighting failure. Soil movement leads to foundation settlement, fixture movement and incorrect elevation or alignment. Cable-entry damage, pavement-interface damage and water-table problems have their own chains.
It captures the civil root causes behind recurring AGL failures. Repeated fixture failures associated with a flooded base can should lead the investigation toward drainage, groundwater and water-table conditions, rather than treating each failed fixture as an isolated electrical failure.
Division 16 lets the engineer inspect the interface across seven layers: the fixture (mounting, elevation, alignment, frangible coupling), the base can, the cable interface, the foundation, the pavement, drainage and the ground (soil movement, groundwater and water-table condition).
Visual evidence includes photographs of base-can condition, corrosion, deformation and internal water, foundation and pavement cracking or settlement, the cable-entry point, sealing arrangement and pit cover, and reference photos of fixture mounting, elevation and alignment. Technical evidence includes elevation and alignment measurements against design, insulation resistance, continuity, drainage verification, historical and seasonal recurrence records and groundwater data.
Every failure receives a severity classification, plus operational-impact tagging. The classes are Critical / Safety-Critical (immediate operational or safety risk), Major / Operationally Critical (significant availability impact), Moderate (reduced performance, not yet critical), Minor / Non-Critical (limited or no operational effect), and Degradation / Intermittent / Latent (a developing or hidden fault).
Flooded base cans, cracked duct seals and settled foundations often trace back to the civil works around the fixture, not the fixture itself — real troubleshooting means understanding drainage, ducting and the base-can-to-pavement interface well enough to fix the actual cause.
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