CAP 437 — Standards for Offshore Helicopter Landing Areas — has become the de facto standard for offshore helideck installations worldwide, and most aviation authorities recommend it for the safe marking of offshore helidecks. Q-Aviation has worked closely with the CAA (UK) and offshore helideck operators for many years to ensure their helideck lighting product range meets the demanding requirements of regulators, clients, and environmental conditions. Effective, reliable helideck lighting systems are essential for safety, ensuring offshore structures remain visible to pilots in all weather conditions.
The video above provides a brief overview of the Q-Aviation Circle & H system and how it operates in practice.
What CAP 437 Actually Requires of a Circle & H System
CAP 437 sets out detailed requirements for how an offshore helideck must be marked and lit so a pilot can identify it, judge its orientation, and land safely in a wide range of visibility and weather conditions — not just clear daylight. The Circle & H marking itself (the circular perimeter with the “H” landing marker) needs to remain clearly visible and correctly proportioned, while the lighting system around it has to perform reliably in exactly the conditions offshore platforms actually experience: salt spray, high winds, vibration, and extended exposure with minimal maintenance access.
That combination — strict visual/photometric compliance plus survival in a genuinely harsh offshore environment — is why helideck lighting is treated as its own specialist category rather than being handled with general industrial or marine fixtures.
Why Perimeter and Circle & H Lighting Needs Dedicated Design
A compliant helideck lighting system typically combines several distinct elements working together: perimeter lights marking the edge of the landing area, the Circle & H markings themselves, status/floodlighting for the deck surface, and obstruction lighting on surrounding structure — all specified to the photometric output, colour, and spacing requirements CAP 437 sets out, and all rated for the hazardous-area classification and corrosion exposure of an offshore installation. Getting any one element wrong — spacing that doesn’t match the required pattern, or a fixture that isn’t rated for the actual area classification — can mean a deck fails compliance even if the rest of the installation is sound.
Specifying Helideck Lighting for Your Platform
Before specifying a helideck lighting upgrade or new installation, the questions worth settling early are: which CAP 437 issue (or equivalent regional standard) applies to your platform and operator, what’s the actual hazardous-area classification of the deck and surrounding structure, and what maintenance access will realistically be available once the system is in service — since offshore helidecks are not an easy place to replace a failed fixture.
Daly Middle East supplies Q-Aviation’s helideck lighting range, including Circle & H systems, perimeter lighting, and obstruction lighting, across the UAE and GCC. To find out more about the system, including full technical specifications and a copy of CAP 437 Issue 8, visit the helideck and aviation lighting product range.