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11.9.6.1 Sensor Location
Where the equipment has a remote sensor then its location at helideck level (as near as practical to the helideck height) will follow the same principles used for locating other meteorological equipment in respect of security from damage and maintenance.
The instrument is sensing ambient air pressure so a remote sensor is unlikely to be adversely affected by ambient conditions around the helideck environs.
Where the equipment is an integrated unit located in the radio room or helideck control cabin, care must be taken to ensure that the air conditioning / ventilation system does not pressurise the location to a value different from the ambient air pressure.
11.9.6.2 Indicator Location The barometric pressure indicator(s) 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).
11.9.6.3 Equipment Specification
A twin altimeter kit (the preferred option) or a precision aneroid barometer should be specified.
Initial calibration should be done at the manufacturer’s facility and a check calibration carried out following installation at site. Thereafter, the instruments should be calibrated every twelve months.
11.9.7 Visibility Measuring Equipment
Visibility information is a key meteorological parameter in all types of aviation for good flight planning and safe flight management. The Aviation Company’s Operations Manual sets the operating minima for public transport operations that comply with aviation regulations.
For helicopters operating to offshore installations and vessels, particularly in hostile environments such as the North Sea, the final approach to the helideck is flown under visual rules. Therefore, it is crucial for flight crews to receive accurate visibility information at the destination installation or vessel.
For many years, visibility information that has been passed to flight crews by personnel (who generally have limited meteorological training and competence) is based on observation and estimation.
11.9.7.1 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 unobscured outboard views for the range finder). The equipment should ideally be set-up and calibrated by a competent specialist familiar with the type of equipment procured.
11.9.7.2 Indicator Location
The visibility 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).
11.9.8 Cloudbase Measuring Equipment
Similar to visibility measurement (See Section 11.9.7), accurate cloudbase measurements are required by flight crews for the same operational reasons. This information is in addition to the observations of cloud formations and types that are a fundamental part of meteorological forecasting in an offshore environment.
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离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 2(66)
