Airport Visual Aids, Apron & Beacon Systems Explained | ICAO Annex 14 | Airfield Ground Lighting (AGL)

SECTION - 8
VISUAL AIDS, APRON & BEACON SYSTEMS
Rahul Sharma | Airfield Ground Lighting (AGL) Specialist © Rahul Sharma
INTRODUCTION
TO
AIRFIELD GROUND LIGHTING (AGL)
By
Rahul Sharma
Airfield Ground Lighting (AGL) Specialist
This presentation is intended for introductory and educational purposes only. It does not constitute engineering specifications or regulatory guidance.

Aerodrome Beacon (ABN)
The Aerodrome Beacon is a high-intensity rotating or
flashing light used to visually identify an airport from long
distances (10–20 miles) during night and low-visibility
operations.
Expert Observation: Operation of the beacon during
daylight hours typically indicates that weather conditions
are IFR (Ceiling < 1,000' or Visibility < 3 SM).
White / Green
Double White / Green
White / Yellow
Green / Yellow / White
FLASH RATE
20–30 FPM
PEAK INTENSITY
Min. 2,000 cd

Wind Direction Indicator (Windsock)
*Measurement standards as per ICAO Annex 14. The sock must
be fully extended at a wind speed of 28 km/h (15 knots).
DIRECTION ONLY
3 kt
PARTIAL EXTENSION
6 kt
FULL EXTENSION
15 kt
VISUAL INTELLIGENCE
Provides a clear, immediate indication of wind speed and
direction to pilots during landing and takeoff phases.
STANDARD COMPLIANCE
ICAO Annex 14 compliant: typically orange or striped
(Orange/White) to ensure maximum daylight contrast.
LVP & NIGHT READINESS
Internal or external illumination is mandatory for 24/7
airport operations and low-visibility procedures (LVP).

Obstruction Lights
Expert Observation: Standards as per ICAO Annex 14. Systems are
designed to ensure pilots can identify and avoid collision with terrain or
man-made structures during all flight phases.
LOW INTENSITY
Typically Fixed Red. Used for obstacles less than 45m in height
located within or near the aerodrome boundary.
MEDIUM INTENSITY
Available in Flashing Red (Type B) or White (Type A). Applied to
objects between 45m and 150m height.
HIGH INTENSITY
High-power Flashing White units. Mandatory for obstacles
exceeding 150m height (e.g., antennas, chimneys).
Aviation obstruction lighting is used to enhance the
visibility of structures or fixed obstacles which may
conflict with the safe navigation of aircraft.
Aviation Orange / White paint marking requirement for daytime visibility

Apron Flood Lighting Systems
OPERATIONAL SAFETY
Ensures 24/7 visibility for ground personnel, passenger
boarding, and high-risk fueling operations on the apron.
TECHNICAL STANDARDS
Complies with ICAO Annex 14 requirements for minimum
illuminance levels and uniformity ratios to minimize safety
incidents.
UNIFORM LIGHT DISTRIBUTION CONCEPT
Optimized tilt angles ensure zero glare for cockpit crews and ATC
towers.
HIGH-EFFICIENCY LED ARRAYS

Apron Edge Lighting (AEL)
BOUNDARY DEFINITION
Delineates the lateral limits of aprons, parking stands,
and maintenance areas, separating movement zones
from unpaved or non-operational ground.
VISUAL INDICATORS
Emits a steady-burning Blue omni-directional light,
clearly distinguishable from runway and taxiway
centerline lighting patterns.
STANDARD COMPLIANCE
Fully compliant with ICAO Annex 14 / FAA standards,
providing critical situational awareness during Low
Visibility Procedures (LVP). COLOR
Standard Blue
SPACING
≤ 60m (Straights)
MOUNTING
Elevated / Inset
ELEVATED OMNI-DIRECTIONAL BLUE LIGHT

Aircraft Stand Markings
Specialist Note: All markings must comply with ICAO Annex 14,
Volume I. Uniformity in color (Yellow for movement, Red for safety)
reduces ground incidents and operational delays.
LEAD-IN & LEAD-OUT LINES
Solid yellow lines that guide the aircraft nose-wheel along a
precise path to ensure wing-tip clearance from adjacent aircraft
and obstacles.
STOP LINES & BARS
Specifically located transverse markings indicating the exact
position where the nose-wheel must stop to align with passenger
bridges or fuel pits.
STAND IDENTIFICATION
Alpha-numeric markings (e.g., Stand 44) placed at the entry of the
stand to ensure pilots enter the correct parking bay assigned by
ATC.
EQUIPMENT SAFETY LINES
Red or white boundary lines defining the "Keep Clear" zone where
ground support equipment (GSE) is prohibited during aircraft
movement.

Lead-in Lighting & Lines
OPERATIONAL PURPOSE
Provides visual guidance along a specific, often curved,
approach path where terrain or obstacles prevent a
straight-in approach or for noise abatement
procedures.
LEAD-IN LIGHTING (LDIN)
Consists of a sequence of flashing lights installed in
the approach area. These are typically high-intensity
white strobe lights providing clear directional cues.
LEAD-IN SURFACE LINES
Painted yellow markings (often accompanied by inset
lights) that guide aircraft from taxiways to the final
aircraft parking stand or gate terminal position.
Standard Color Configuration
SURFACE MARKINGS FOR PARKING STAND DOCKING
Aviation Yellow / White Strobes Linear / Curved Guidance Path

Visual Docking Guidance System (VDGS)
ADVANCED SENSOR CORE
High-precision LiDAR and 3D laser scanners verify
aircraft type and track fuselage alignment with
centimeter-level accuracy.
DYNAMIC PILOT FEEDBACK
Real-time azimuth guidance and longitudinal closing
rates are presented on sunlight-readable LED displays
for direct cockpit view.
INTELLIGENT SAFETY NET
Integrated collision avoidance systems monitor the
apron for obstacles, with emergency stop triggers for
ground crews. AZIMUTH
Centerline Alignment
CLOSING RATE
Distance to Stop Bar
VERIFICATION
Aircraft Type Check

Airport Visual Aids, Apron & Beacon Systems Explained | ICAO Annex 14 | Airfield Ground Lighting (AGL)

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