Getting your crew safely to and from offshore locations can be challenging. Since February 2013 the CAA (UK) have specified standards to improve the safety of night helicopter manoeuvres offshore. Orga’s Circle-H system is a fit-for-purpose solution that makes sure your helideck safety complies.

Helicopter pilots who perform night flights to offshore locations often encounter difficult landing situations. The entire platform is illuminated, but the helideck is almost completely dark. Touching down on a dark helideck is challenging enough. When weather circumstances deteriorate, landing a helicopter safely can become difficult and even risky.

The lights in Orga’s TD/PM Circle-H lighting system burn a steady yellow and green. The yellow lights illuminate the Touchdown/Positioning Marking Circle, while the green lights illuminate the Heliport Identification Marking ‘H’ to give the helicopter pilot clear visual cues during approach and landing at night and in all types of weather conditions.

circle-h drawing

    Key features

    • No black hole effect
    • High quality marine materials
    • Strong flexible metal parts with low profile for wheel and skid landing gear
    • Modular lighting system
    • Minimal installation time
    • Robust cable protection
    • Compatible to be used in combination with DIFF system
    • State of the art high power LED and technology provides superior life and reliability
    • Low system power consumption
    • Proven to meet the operational and environmental requirements offshore
    • Suitable for high pressure jet cleaning


    • CAAi and HCA system approval to CAA-UK CAP 437;8th edition appendix C
    • ABS Certificate of Design Assessment – Orga CAP437 TD/PM Circle-H System – 15-LD1264711-PDA
    • IECEx and ATEX certificate for all relevant components available

    Performance characteristics

    • Steady burning; green H lighting and yellow Circle lighting
    • Effective intensity H: 2-12° max. 60 cd; 12-20° max. 30 cd and 20-90° max. 10 cd
    • Effective intensity Circle: 0-10° max. 60 cd; 10-20° max. 45 cd and 20-90° max. 15 cd
    • Horizontal beam coverage: as per CAP437
    • Colour chromaticity: as per CAP437

    Electrical characteristics

    • Operating voltage: from control panel (low voltage max 20Vdc)
    • Power consumption: max 86 W average
    • Connection details junction box: max. 6 mm²; 4xM32 entry, 1x M25 entry

    Physical characteristics

    • Circle consisting of n plates (n depending on D-value of helideck) 10 kg per plate
    • H consisting of 7 plates total 240 kg;
    • Degree of protection: IP66, IP67 and IP69 for Circle and H
    • Degree of protection: IP66 for system junction box
    • Operating temperature range: -25ºC to +55ºC

    System design, control and monitoring

    • Provided with cabling; on deck and through deck routing possible
    • Fault monitoring with fail indication via separate system control and monitoring box (see separate data sheet)