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11.9.8.1 Sensor Location
The equipment sensor should be located on the installation or vessel according to the manufacturers instructions (normally somewhere around the helideck environs with an unobscured overhead view for the range finder). The equipment should ideally be set-up and calibrated by a competent specialist familiar with the type of equipment procured.
11.9.8.2 Indicator Location
The cloudbase indicator should be located at a suitable control point where the HLO and / or Radio Operator can easily obtain readings to transmit to the flight crews (See Sections 11.8.3.1).
11.9.9 Vessel Motion Measuring Equipment
CAP 437 requires all floating structures and vessels equipped with helidecks and operating on the UKCS to provide fully operational and serviceable equipment for measuring helideck motions.
To comply with current requirements, floating offshore installations and vessels with helidecks should be provided with equipment for ascertaining the vessel roll, pitch, heave, yaw and heading. Ideally the system that is provided should be automatic and should read and record the actual motion at the centre of the helideck surface (in real time), forecasted (10 minutes look ahead) and log the historical data electronically (recorded at 10 minute and 1 hour intervals).
NOTE: In the relatively near future CAP 437 will recommend the provision of ‘MOTION SEVERITY INDEX’ (MSI) in addition to vessel roll, pitch and heave for a helicopter to land and remain safely on the helideck. Although the MSI algorithms could be implemented in existing motion sensing systems on vessels, it is likely that it will be provided by dedicated motion sensing equipment. This will normally comprise an accelerometer package which, ideally, is mounted under the centre of the helideck and a remote PC-based processing and display package.
The single number MSI produced by processing a 10 minute ‘moving window’ of helideck motion data. This number is reported to the helicopter flight crew who will compare it with the limit of operability for their aircraft. The limits will vary with wind speed, and a wind speed input to the motion sensing system may also be required in connection with determining deck handling procedures.
Designers are advised that either new vessels or vessels undergoing re-fit that are currently in design or under construction for operations in the UKCS should automatically be specified and equipped with helideck motion sensing equipment that is at least capable of being modified to produce the MSI.
See also Section 10
11.9.9.1 Location
Sensors normally located beneath the helideck at the centre of the safe landing area are used to provide motion information at a control point where it is processed to give readout on a PC.
11.9.9.2 Equipment Specification
The equipment should be capable of recording the maximum pitch, roll and heave prior to a helicopter landing (recorded at 1 hour and 10 minute intervals) and the measurement of heave should accurately reflect the motion being experienced at the helideck.
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离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 2(67)
